DES algorithm follows the Feistel Structure
Most of the Block cipher algorithms follows Feistel Structure
BLOCK SIZE - 64 bits Plain Text
No. of Rounds - 16 Rounds
Key Size - 64 bits
Sub Key Size - 48 bits
No. of Sub Keys - 16 Sub Keys
Cipher Text - 64 bits

Views: 187974
Sundeep Saradhi Kanthety

In this network security video tutorial we will study and understand the working of Electronic Code Block also known as ECB algorithm mode.
Electronic Code Block (ECB) -
1. The simplest mode of operation
2. Plain text message is divided into blocks of 64 bits each.
3. Each such block is encrypted independently of the other blocks.
4. For all blocks same key is used for encryption.
5. If a plain text block repeats in the original messages, the corresponding cipher text block will also repeat in the encrypted message.
6. Suitable only for small messages.
Complete Network Security / Information Security Playlist - https://www.youtube.com/watch?v=IkfggBVUJxY&list=PLIY8eNdw5tW_7-QrsY_n9nC0Xfhs1tLEK
Download my FREE Network Security Android App - https://play.google.com/store/apps/details?id=com.intelisenze.networksecuritytutorials
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For More Technology News, Latest Updates and Blog articles visit our Official Website - http://simplesnippets.tech/
#ElectronicCodeBook #AlgorithmModes #NetworkSecurity #ECB #Cryptography #BlockCiphers

Views: 4136
Simple Snippets

1. Electronic Code Book Mode
2. Cipher Block Chaining Mode
3. Output Feedback Mode
4. Cipher Feedback Mode
5. Counter Mode

Views: 56438
Sundeep Saradhi Kanthety

Crashcourse Playlist: https://www.youtube.com/playlist?list=PLjwO-iVuY1v1kxWtOsqKEuXDB4ijXSHIk
Book: Understanding Cryptography
https://www.amazon.com/Understanding-Cryptography-Textbook-Students-Practitioners/dp/3642041000/ref=as_li_ss_tl?ie=UTF8&qid=1541146284&sr=8-1&keywords=Understanding+Cryptography:+A+Textbook+for+Students+and+Practitioners&linkCode=sl1&tag=julianhosp-20&linkId=8e14aad9056003d3eefcacb57c2e0b73&language=en_US
----------
New to cryptocurrencies? You might want to read this book first!
http://cryptofit.community/cryptobook
If you liked the video, subscribe to my channel, give a "thumbs up" and share this video to make the world together #cryptofit :)
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Bitcoin: 3MNWaot64Fr1gRGxv4YzHCKAcoYTLXKxbc
Litecoin: MTaGwg5EhKooonoVjDktroiLqQF6Rvn8uE
---------------
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► My website: http://www.julianhosp.com
----------------
My name is Dr. Julian Hosp or just Julian.
My videos are about Bitcoin, Ethereum, Blockchain and crypto currencies in general, to avoid scam, rip-off and fraud especially in mining. I'm talking about how you can invest wisely and do it rationally and simply. My ultimate goal is to make people all around the world #CRYPTOFIT. I.E fit for this new wave of decentralization and blockchain. Have fun!
► Follow me here and stay in touch:
Facebook: www.facebook.com/julianhosp/
Twitter: https://twitter.com/julianhosp
Instagram: https://www.instagram.com/julianhosp/
Linkedin: https://www.linkedin.com/julianhosp

Views: 948
Dr. Julian Hosp

In this network security video tutorial we will study and understand the working of Counter Mode (CTR) also known as CTR algorithm mode.
Counter Mode (CTR) -
1. Counter Mode uses sequence numbers called as counters as the inputs.
2. Usually a constant is used as the initial counter value
Incremented for every iteration.
3. The size of the counter block is same as that of the plain text block.
Complete Network Security / Information Security Playlist - https://www.youtube.com/watch?v=IkfggBVUJxY&list=PLIY8eNdw5tW_7-QrsY_n9nC0Xfhs1tLEK
Download my FREE Network Security Android App - https://play.google.com/store/apps/details?id=com.intelisenze.networksecuritytutorials
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For More Technology News, Latest Updates and Blog articles visit our Official Website - http://simplesnippets.tech/
#CounterMode #AlgorithmModes #NetworkSecurity #Cryptography #BlockCiphers

Views: 2454
Simple Snippets

https://8gwifi.org/CipherFunctions.jsp
Reference book: http://leanpub.com/crypto
Cryptographic Algorithms generally fall into one of two different categories, or are a combination of both.
Symmetric
Fast
Only provide confidentiality
Examples: DES, AES, Blowfish, RC4, RC5
Asymmetric
Large mathematical operations make it slower than symmetric algorithms
No need for out of band key distribution (public keys are public!)
Scales better since only a single key pair needed per individual
Can provide authentication and nonrepudiation
Examples: RSA, El Gamal, ECC, Diffie-Hellman
problem with symmetric key cryptography
DES (Data Encryption Standard)
64 bit key that is effectively 56 bits in strength
Actual algorithm is called DEA (Data Encryption Algorithm)
DES Modes
Electronic Code Book
Cipher Block Chaining (most commonly used for general purpose encryption)
Cipher Feedback
Output Feedback
Counter Mode (used in IPSec)
3DES
112-bit effective key length
Uses either 2 or 3 different smaller keys in one of several modes
Modes
EEE2/3
EDE2/3
AES
NIST replaced DES in 1997 with this
Uses the Rijndael algorithm
Supports key/block sizes of 128, 192, and 256 bits
Uses 10/12/14 rounds as block size increases
IDEA (International Data Encryption Algorithm)
Operates on 64 bit blocks in 8 rounds with 128 bit key
Considered stronger than DES and is used in PGP
Blowfish
64 bit block cipher with up to 448 bit key and 16 rounds
Designed by Bruce Schneier
RC4
Stream cipher with variable key size created by Ron Rivest
RC5
Another Rivest cipher
Block cipher with 32/64/128 bit blocks and keys up to 2048 bits
RC6
Beefier version of RC5 submitted as AES candidate
CAST
64 bit block cipher with keys between 40-128 bits with 12-16 rounds depending on key length
CAST-256 used 128-bit blocks and keys from 128-256 bits using 48 rounds
SAFER (Secure and Fast Encryption Routine)
Set of patent-free algorithms in 64 and 128 bit block variants
Variation used in Bluetooth
Twofish
Adapted version of Blowfish with 128 bit blocks, 128-256 bit keys and 16 rounds
AES Finalist
Kryptografie mit symmetrischem Schlüssel
symmetric key cryptography
symmetric key cryptography tutorial
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symmetric key cryptography vs asymmetric key cryptography
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Kryptografie mit symmetrischem Schlüssel
Kryptographie mit symmetrischem Schlüssel
Kryptographie mit symmetrischem Schlüssel
Kryptografie mit symmetrischem Schlüssel und asymmetrische Schlüsselkryptographie
symmetrische und asymmetrische Schlüsselkryptographie
Kryptografie mit symmetrischem Schlüssel

Views: 42387
Zariga Tongy

📖📕 GET THE NEW TINKERNUT BOOK: http://bit.ly/Tinkernutbook 📕📖
This video lays out the steps for creating a very simple encryption and decryption program using free tools. The programming language we will be using is VB Script. See if you can decrypt this text:
wkjlue#vnrro#huxwxi#uxr\
You can find all the code for this program as well as an alternative for Apple computers at the project page:
http://www.tinkernut.com/archives/4193

Views: 103027
Tinkernut

For slides, a problem set and more on learning cryptography, visit www.crypto-textbook.com.
The AES book chapter for this video is also available at the web site (click Sample Chapter).

Views: 186050
Introduction to Cryptography by Christof Paar

For slides, a problem set and more on learning cryptography, visit www.crypto-textbook.com.
The book chapter "Introduction" for this video is also available for free at the website (click "Sample Chapter").

Views: 454810
Introduction to Cryptography by Christof Paar

Problem Solved from William Stallings
Book : Cryptography and Network Security
Fifth Editon

Views: 18535
Random Videos

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Views: 7678
5 Minutes Engineering

In this network security video tutorial we will study and understand the working of Cipher Block Chaining (CBC) also known as CBC algorithm mode.
Cipher Block Chaining (CBC) -
1. Chaining adds a feedback mechanism to a block cipher
2. The results of the encryption of the previous block are fed back into the encryption of the current block.
3. In the first step; the first block of plain text and a random block of text, called Initialization Vector (IV) is used.
4. The IV has no special meaning it is simply used to make each message unique.
5. The value of IV is generated randomly.
Complete Network Security / Information Security Playlist - https://www.youtube.com/watch?v=IkfggBVUJxY&list=PLIY8eNdw5tW_7-QrsY_n9nC0Xfhs1tLEK
Download my FREE Network Security Android App - https://play.google.com/store/apps/details?id=com.intelisenze.networksecuritytutorials
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For More Technology News, Latest Updates and Blog articles visit our Official Website - http://simplesnippets.tech/
#CipherBlockChaining #AlgorithmModes #NetworkSecurity #Cryptography #BlockCiphers

Views: 5490
Simple Snippets

Encrypt the message MAKE IT HAPPEN using the Vigenėre cipher and key word MATH.

Views: 166684
MathAfterMath

http://asecuritysite.com/subjects/chapter58
I forgot to add the key to each of the stages of CBC.

Views: 17814
Bill Buchanan OBE

The complete YouTube playlist can be viewed here: https://goo.gl/mjyDev
This lesson explains Block ciphers - Modes of Operation, under the course, "Cryptography and Network Security for GATE Computer Science Engineering".
The lesson explains the following subtopics:
Block Ciphers - Modes of Operation
Electronic Codebook Mode
Cipher Block Chaining Mode - Encryption and Decryption
Some important terminology and concepts are also illustrated, for the better understanding of the subject.
For the entire course: https://goo.gl/aTMBNZ
For more lessons by Ansha Pk: https://goo.gl/2DX9Wn
Must watch for all the GATE/ESE/PSU Exams.
Download the Unacademy Learning App from the Google Play Store here:- https://goo.gl/02OhYI
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Visit Our Facebook Group on GATE here: https://goo.gl/cPj5sb
Cryptography and Network Security - Block Ciphers - Modes of Operation(Part 1) - GATE CSE

Views: 15004
Unacademy - GATE Preparation

Modes of operation for block ciphers, introducing ECB, CBC and Counter mode. Course material via: http://sandilands.info/sgordon/teaching

Views: 23589
Steven Gordon

Today we’re going to talk about how to keep information secret, and this isn’t a new goal. From as early as Julius Caesar’s Caesar cipher to Mary, Queen of Scots, encrypted messages to kill Queen Elizabeth in 1587, theres has long been a need to encrypt and decrypt private correspondence. This proved especially critical during World War II as Allan Turing and his team at Bletchley Park attempted to decrypt messages from Nazi Enigma machines, and this need has only grown as more and more information sensitive tasks are completed on our computers. So today, we’re going to walk you through some common encryption techniques such as the Advanced Encryption Standard (AES), Diffie-Hellman Key Exchange, and RSA which are employed to keep your information safe, private, and secure.
Note: In October of 2017, researchers released a viable hack against WPA2, known as KRACK Attack, which uses AES to ensure secure communication between computers and network routers. The problem isn't with AES, which is provably secure, but with the communication protocol between router and computer. In order to set up secure communication, the computer and router have to agree through what's called a "handshake". If this handshake is interrupted in just the right way, an attacker can cause the handshake to fault to an insecure state and reveal critical information which makes the connection insecure. As is often the case with these situations, the problem is with an implementation, not the secure algorithm itself. Our friends over at Computerphile have a great video on the topic: https://www.youtube.com/watch?v=mYtvjijATa4
Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios
Want to know more about Carrie Anne?
https://about.me/carrieannephilbin
The Latest from PBS Digital Studios: https://www.youtube.com/playlist?list=PL1mtdjDVOoOqJzeaJAV15Tq0tZ1vKj7ZV
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CC Kids: http://www.youtube.com/crashcoursekids

Views: 231242
CrashCourse

https://8gwifi.org/CipherFunctions.jsp
Reference book: http://leanpub.com/crypto
Computer Security, Cryptography Advanced Encryption Standard AES,fips 197
The Advanced Encryption Standard (AES) specifies a FIPS-approved
cryptographic algorithm that can be used to protect electronic data. The AES algorithm is a symmetric block cipher that can encrypt (encipher) and decrypt (decipher) information. Encryption converts data to an unintelligible form called ciphertext; decrypting the ciphertext converts the data back into its original form, called plaintext.
The AES algorithm is capable of using cryptographic keys of 128, 192, and 256 bits to encrypt and decrypt data in blocks of 128 bits.
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Views: 156744
Zariga Tongy

In this network security video tutorial we will study and understand the working of Cipher Cipher Feedback (CFB) also known as CFB algorithm mode.
Cipher Feedback (CFB) -
1. In this mode data is encrypted in units that are smaller (e.g. they could be of size 8 bits) than a defined block size (which is usually 64 bits).
2. CFB mode works with j bits at a time (as we have seen, usually, but not always , j = 8)
Following are the steps of CFB mode -
Step 1 - Encrypt the IV(initialization vector) using the KEY to get the Encrypted IV.
Step 2 - Perform XOR operation between first j bits of encrypted IV and j bits of Plain Text to get j bits of Cipher Text(Cipher text block 1)
Step 3 - left shift the IV by j bits & add the cipher text block from the previous step to the right most side of the IV.
Complete Network Security / Information Security Playlist - https://www.youtube.com/watch?v=IkfggBVUJxY&list=PLIY8eNdw5tW_7-QrsY_n9nC0Xfhs1tLEK
Download my FREE Network Security Android App - https://play.google.com/store/apps/details?id=com.intelisenze.networksecuritytutorials
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For More Technology News, Latest Updates and Blog articles visit our Official Website - http://simplesnippets.tech/
#CipherFeedbackMode #AlgorithmModes #NetworkSecurity #CFB #Cryptography #BlockCiphers

Views: 3938
Simple Snippets

In this network security video tutorial we will study and understand the working of Output Feedback (OFB) also known as OFB algorithm mode.
Output Feedback (OFB) -
1. In this mode data is encrypted in units that are smaller (e.g. they could be of size 8 bits) than a defined block size (which is usually 64 bits).
2. OFB mode works with j bits at a time (as we have seen, usually, but not always , j = 8)
3. OFB mode is extremely similar to the CFB
4. The only difference is that in the case of CFB, the cipher text is fed into the next stage of encryption process.
5. In case of OFB, the output of the IV encryption process is fed into the next stage of encryption process.
Following are the steps of OFB mode -
Step 1 - Encrypt the IV(initialization vector) using the KEY to get the Encrypted IV.
Step 2 - Perform XOR operation between first j bits of encrypted IV and j bits of Plain Text to get j bits of Cipher Text(Cipher text block 1)
Step 3 - left shift the IV by j bits & add theencrypted IV from the previous step to the right most side of the original IV.
Complete Network Security / Information Security Playlist - https://www.youtube.com/watch?v=IkfggBVUJxY&list=PLIY8eNdw5tW_7-QrsY_n9nC0Xfhs1tLEK
Download my FREE Network Security Android App - https://play.google.com/store/apps/details?id=com.intelisenze.networksecuritytutorials
Simple Snippets Official Website -
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Simple Snippets on Facebook -
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Simple Snippets on Twitter -
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Simple Snippets email ID -
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For More Technology News, Latest Updates and Blog articles visit our Official Website - http://simplesnippets.tech/
#OutputFeedbackMode #AlgorithmModes #NetworkSecurity #Cryptography #BlockCiphers

Views: 2972
Simple Snippets

Part 1 of the course: https://youtu.be/GGILQcO843s
Book: Understanding Cryptography
https://www.amazon.com/Understanding-Cryptography-Textbook-Students-Practitioners/dp/3642041000/ref=as_li_ss_tl?ie=UTF8&qid=1541146284&sr=8-1&keywords=Understanding+Cryptography:+A+Textbook+for+Students+and+Practitioners&linkCode=sl1&tag=julianhosp-20&linkId=8e14aad9056003d3eefcacb57c2e0b73&language=en_US
----------
New to cryptocurrencies? You might want to read this book first!
http://cryptofit.community/cryptobook
If you liked the video, subscribe to my channel, give a "thumbs up" and share this video to make the world together #cryptofit :)
► Subscribe: https://www.youtube.com/channel/UCseN...
► Cryptocurrency Exchange: https://www.binance.com/?ref=11272739
► Hardware Wallet: http://www.julianhosp.com/hardwallet
► Ruben's Trinkgeld Adressen:
Bitcoin: 3MNWaot64Fr1gRGxv4YzHCKAcoYTLXKxbc
Litecoin: MTaGwg5EhKooonoVjDktroiLqQF6Rvn8uE
---------------
► Completely NEW? What is Blockchain, Bitcoin and Co? Get this book from me: https://www.amazon.com/Cryptocurrenci...
► Join our Facebook group:
https://www.facebook.com/groups/crypt...
► iTunes Podcast: https://itunes.apple.com/sg/podcast/t...
► My website: http://www.julianhosp.com
----------------
My name is Dr. Julian Hosp or just Julian.
My videos are about Bitcoin, Ethereum, Blockchain and crypto currencies in general, to avoid scam, rip-off and fraud especially in mining. I'm talking about how you can invest wisely and do it rationally and simply. My ultimate goal is to make people all around the world #CRYPTOFIT. I.E fit for this new wave of decentralization and blockchain. Have fun!
► Follow me here and stay in touch:
Facebook: www.facebook.com/julianhosp/
Twitter: https://twitter.com/julianhosp
Instagram: https://www.instagram.com/julianhosp/
Linkedin: https://www.linkedin.com/julianhosp

Views: 1031
Dr. Julian Hosp

Cryptography and Network Security by Prof. D. Mukhopadhyay, Department of Computer Science and Engineering, IIT Kharagpur. For more details on NPTEL visit http://nptel.iitm.ac.in

Views: 30741
nptelhrd

#askfaizan | #syedfaizanahmad | #cbc
Block Cipher Modes of Operation | ECB mode | Part 1 https://youtu.be/mkY5mNSnuko
Hill Cipher | Complete Algorithm with Example https://youtu.be/B0Q7w7Fd7ms
Playfair Substitution Cipher https://youtu.be/w_xr7pj-O6c
Monoalphabetic Substitution Cipher https://youtu.be/Hw1T7GOnVW0
Caesar Cipher | Caesar Substitution Cipher https://youtu.be/2N9GlhysYJw
PlayList : Cryptography and Network Security : https://www.youtube.com/playlist?list=PLhwpdymnbXz7hvvqhqjIIG4tEdhAgQqll
Block cipher processes the data blocks of fixed size
If size of message is larger than block size. Then, the message is divided into a series of sequential message blocks.
Multiple blocks of plaintext are encrypted using the same key, security issues arise.
To apply a block cipher in a variety of applications, five modes of operation have been defined by NIST
1. Electronic Code Book Mode
2. Cipher Block Chaining Mode
3. Output Feedback Mode
4. Cipher Feedback Mode
5. Counter Mode
The simplest mode is the electronic codebook (ECB) mode
Plaintext is handled one block at a time
Each block of plaintext is encrypted using the same key
The ECB mode is deterministic
If plaintext block P1, P2,…, Pm are encrypted twice under the same key, the output ciphertext blocks will be the same.
CBC is technique in which the same plaintext block, if repeated, produces different ciphertext blocks
Each plaintext block is XORed with the ciphertext block that was previously produced
To produce the first block of ciphertext, an initialization vector (IV) is XORed with the first block of plaintext
For decryption, IV data is XORed with first ciphertext block decrypted.

Views: 1794
Ask Faizan

http://asecuritysite.com/encryption/threedes

Views: 15410
Bill Buchanan OBE

For slides, a problem set and more on learning cryptography, visit www.crypto-textbook.com

Views: 70041
Introduction to Cryptography by Christof Paar

This visualization demonstrates the difference between AES Encryption using Electronic Code Book (ECB) and AES Encryption using Cipher Block Chaining (CBC).
Cipher Block Chaining is clearly the stronger of the two.
The AES encryption was written in Rust (github link to come) for a project in my Applied Cryptography course.
The animation was created using 3Blue1Brown's manim library: https://github.com/3b1b/manim

Views: 266
ObliqueMotion

Views: 11837
Internetwork Security

Subject:Computer Science
Paper: Cryptography and network

Views: 4556
Vidya-mitra

In this video we look at substitution ciphers: how they are made and how to break them.

Views: 64858
Pico Cetef

In this network security video tutorial we will study and understand the different types of algorithms and the different modes in which these algorithms work.
An algorithm type is basically how the algorithm operates on the plain text to get the cipher text. It can be classified into 2 categories -
1. Stream Ciphers - Stream cipher techniques involves the encryption of plain text one bit at a time and decryption also happens one bit at a time.
2. Block Ciphers - Block cipher techniques involves the encryption of plain text one block(64 bit or some fixed size) at a time and decryption also happens one block at a time.
Algorithm modes -
An Algorithm mode is a combination of a series of the basic algorithm steps on block cipher and some kind of feedback from the previous step.
In general there are 5 different types of algorithm modes in NS-
1. Electronic Code Book (ECB)
2. Cipher Block Chaining (CBC)
3. Cipher Feedback (CFC)
4. Output Feedback (OFB)
5. Counter Mode (CTR)
Complete Network Security / Information Security Playlist - https://www.youtube.com/watch?v=IkfggBVUJxY&list=PLIY8eNdw5tW_7-QrsY_n9nC0Xfhs1tLEK
Download my FREE Network Security Android App - https://play.google.com/store/apps/details?id=com.intelisenze.networksecuritytutorials
Simple Snippets Official Website -
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Simple Snippets on Facebook -
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Simple Snippets on Instagram -
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Simple Snippets on Twitter -
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For More Technology News, Latest Updates and Blog articles visit our Official Website - http://simplesnippets.tech/
#BlockCipherVsStreamCipher #AlgorithmModes #NetworkSecurity #Cryptography #BlockCiphers #StreamCiphers #ECB #CBC #CFB #OFB #CounterMode

Views: 1630
Simple Snippets

#rsa #deffiehellman #cryptographylectures #lastmomenttuitions
Take the Full Course of Cryptography and Network Security
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Cryptography and System Security Index
Lecture 1 Introduction to Cryptography and Security System
Lecture 2 Security Goals and Mechanism
Lecture 3 Symmetric Cipher
Lecture 4 Substitution Cipher
Lecture 5 Transposition Cipher
Lecture 6 Stream and Block Cipher
Lecture 7 Mono Alphabetic Cipher
Lecture 8 Poly Alphabetic Cipher
Lecture 9 Diffie Hellman
Lecture 10 RSA Algorithm with Solved Example
Lecture 11 IDEA Algorithm Full Working
Lecture 12 SHA-1 Algorithm Full Working
Lecture 13 Blowfish Algorithm Full working
Lecture 14 DES Algorithm Full Working
Lecture 15 Confusion and Diffusion
Lecture 16 AES Algorithm Full working
Lecture 17 Kerberos
Lecture 18 Malicious Software ( Virus and worms )
Lecture 19 DOS and DDOS Attack
Lecture 20 Digital Signature Full working Explained
More videos Coming Soon.

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Last moment tuitions

Book: Understanding Cryptography
https://www.amazon.com/Understanding-Cryptography-Textbook-Students-Practitioners/dp/3642041000/ref=as_li_ss_tl?ie=UTF8&qid=1541146284&sr=8-1&keywords=Understanding+Cryptography:+A+Textbook+for+Students+and+Practitioners&linkCode=sl1&tag=julianhosp-20&linkId=8e14aad9056003d3eefcacb57c2e0b73&language=en_US
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My name is Dr. Julian Hosp or just Julian.
My videos are about Bitcoin, Ethereum, Blockchain and crypto currencies in general, to avoid scam, rip-off and fraud especially in mining. I'm talking about how you can invest wisely and do it rationally and simply. My ultimate goal is to make people all around the world #CRYPTOFIT. I.E fit for this new wave of decentralization and blockchain. Have fun!
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Dr. Julian Hosp

Audible free book: http://www.audible.com/computerphile
Hashing Algorithms are used to ensure file authenticity, but how secure are they and why do they keep changing? Tom Scott hashes it out.
More from Tom Scott: http://www.youtube.com/user/enyay and https://twitter.com/tomscott
http://www.facebook.com/computerphile
https://twitter.com/computer_phile
This video was filmed and edited by Sean Riley.
Pigeon Sound Effects courtesy of http://www.freesfx.co.uk/
Computerphile is a sister project to Brady Haran's Numberphile. See the full list of Brady's video projects at: http://bit.ly/bradychannels

Views: 786437
Computerphile

Dr. Soper discusses encryption concepts. Topics covered include encryption algorithms, keyed and keyless cryptosystems, cryptanalysis, breaking encrypted messages, substitution, transposition, and product ciphers, the Caesar cipher, the Vigenère cipher, one-time pads, the Vernam cipher, book ciphers, symmetric and asymmetric cryptosystems, public-key encryption, stream ciphers, block ciphers, the data encryption standard (DES), and the advanced encryption standard (AES).

Views: 33623
Dr. Daniel Soper

1. Electronic code book 2. cipher block chaining 3.cipher feedback mode 4. output feedback mode 5.counter mode

Views: 61
t v nagaraju Technical

This video is part of the Udacity course "Intro to Information Security". Watch the full course at https://www.udacity.com/course/ud459

Views: 2262
Udacity

#askfaizan | #syedfaizanahmad | #counter
Block Cipher Modes of Operation | OFB mode https://youtu.be/F2RwmXwrdV8
Block Cipher Modes of Operation | CFB mode https://youtu.be/yF_iA7Rv7k4
Block Cipher Modes of Operation | CBC mode | Part 2 https://youtu.be/Q7LKmASkVSU
Block Cipher Modes of Operation | ECB mode | Part 1 https://youtu.be/mkY5mNSnuko
Hill Cipher | Complete Algorithm with Example https://youtu.be/B0Q7w7Fd7ms
Playfair Substitution Cipher https://youtu.be/w_xr7pj-O6c
Monoalphabetic Substitution Cipher https://youtu.be/Hw1T7GOnVW0
Caesar Cipher | Caesar Substitution Cipher https://youtu.be/2N9GlhysYJw
PlayList : Cryptography and Network Security : https://www.youtube.com/playlist?list=PLhwpdymnbXz7hvvqhqjIIG4tEdhAgQqll
Block cipher processes the data blocks of fixed size
If size of message is larger than block size. Then, the message is divided into a series of sequential message blocks.
Multiple blocks of plaintext are encrypted using the same key, security issues arise.
To apply a block cipher in a variety of applications, five modes of operation have been defined by NIST
1. Electronic Code Book Mode
2. Cipher Block Chaining Mode
3. Output Feedback Mode
4. Cipher Feedback Mode
5. Counter Mode
The simplest mode is the electronic codebook (ECB) mode
Plaintext is handled one block at a time
Each block of plaintext is encrypted using the same key
The ECB mode is deterministic
If plaintext block P1, P2,…, Pm are encrypted twice under the same key, the output ciphertext blocks will be the same.
CBC is technique in which the same plaintext block, if repeated, produces different ciphertext blocks
Each plaintext block is XORed with the ciphertext block that was previously produced
To produce the first block of ciphertext, an initialization vector (IV) is XORed with the first block of plaintext
For decryption, IV data is XORed with first ciphertext block decrypted.
CFB is similar to CBC, it also make use of Initialization Vector.
In CFB, plaintext (b bits) is divided into segments of s bits.
Process s bits at a time.
Common value of s is 8 bits.
Cipher text block is encrypted and the output is XOR-ed with the current Plain text block to create the current Cipher text block.
Each ciphertext block gets ‘fed back’ into the encryption process in order to encrypt the next plaintext block.
The output feedback (OFB) mode is similar in structure to that of CFB.
In CFB, the ciphertext unit is fed back to the shift register,
In OFB, The output of the encryption function is fed back to the shift register.
It remains localized to one single block,
Affecting one plaintext block affects one ciphertext block only
Complementing a bit in the ciphertext complements a bit in the plaintext.
Like OFB, Counter mode turns a block cipher into a stream cipher
It generates the next keystream block by encrypting successive values of a “counter”.
A counter equal to the plaintext block size.
The counter is initialized to some value and then incremented by 1 for each subsequent block.

Views: 765
Ask Faizan

#askfaizan | #syedfaizanahmad | #ofb
Block Cipher Modes of Operation | CFB mode https://youtu.be/yF_iA7Rv7k4
Block Cipher Modes of Operation | CBC mode | Part 2 https://youtu.be/Q7LKmASkVSU
Block Cipher Modes of Operation | ECB mode | Part 1 https://youtu.be/mkY5mNSnuko
Hill Cipher | Complete Algorithm with Example https://youtu.be/B0Q7w7Fd7ms
Playfair Substitution Cipher https://youtu.be/w_xr7pj-O6c
Monoalphabetic Substitution Cipher https://youtu.be/Hw1T7GOnVW0
Caesar Cipher | Caesar Substitution Cipher https://youtu.be/2N9GlhysYJw
PlayList : Cryptography and Network Security : https://www.youtube.com/playlist?list=PLhwpdymnbXz7hvvqhqjIIG4tEdhAgQqll
Block cipher processes the data blocks of fixed size
If size of message is larger than block size. Then, the message is divided into a series of sequential message blocks.
Multiple blocks of plaintext are encrypted using the same key, security issues arise.
To apply a block cipher in a variety of applications, five modes of operation have been defined by NIST
1. Electronic Code Book Mode
2. Cipher Block Chaining Mode
3. Output Feedback Mode
4. Cipher Feedback Mode
5. Counter Mode
The simplest mode is the electronic codebook (ECB) mode
Plaintext is handled one block at a time
Each block of plaintext is encrypted using the same key
The ECB mode is deterministic
If plaintext block P1, P2,…, Pm are encrypted twice under the same key, the output ciphertext blocks will be the same.
CBC is technique in which the same plaintext block, if repeated, produces different ciphertext blocks
Each plaintext block is XORed with the ciphertext block that was previously produced
To produce the first block of ciphertext, an initialization vector (IV) is XORed with the first block of plaintext
For decryption, IV data is XORed with first ciphertext block decrypted.
CFB is similar to CBC, it also make use of Initialization Vector.
In CFB, plaintext (b bits) is divided into segments of s bits.
Process s bits at a time.
Common value of s is 8 bits.
Cipher text block is encrypted and the output is XOR-ed with the current Plain text block to create the current Cipher text block.
Each ciphertext block gets ‘fed back’ into the encryption process in order to encrypt the next plaintext block.
The output feedback (OFB) mode is similar in structure to that of CFB.
In CFB, the ciphertext unit is fed back to the shift register,
In OFB, The output of the encryption function is fed back to the shift register.
It remains localized to one single block,
Affecting one plaintext block affects one ciphertext block only
Complementing a bit in the ciphertext complements a bit in the plaintext.

Views: 988
Ask Faizan

~~~ Book cipher ~~~
Title: What is Book cipher? Explain Book cipher, Define Book cipher, Meaning of Book cipher
Created on: 2018-08-18
Source Link: https://en.wikipedia.org/wiki/Book_cipher
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Description: A book cipher is a cipher in which the key is some aspect of a book or other piece of text. Books, being common and widely available in modern times, are more convenient for this use than objects made specifically for cryptographic purposes. It is typically essential that both correspondents not only have the same book, but the same edition.Traditionally book ciphers work by replacing words in the plaintext of a message with the location of words from the book being used. In this mode, book ciphers are more properly called codes. This can have problems; if a word appears in the plaintext but not in the book, it cannot be encoded. An alternative approach which gets around this problem is to replace individual letters rather than words. One such method, used in the second Beale cipher, substitutes the first letter of a word in the book with that word's position. In this case, the book cipher is properly a cipher — specifically, a homophonic substitution cipher. However, if used often, this technique has the side effect of creating a larger ciphertext and increases the time and effort required to decode the message.
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Source: Wikipedia.org articles, adapted under https://creativecommons.org/licenses/by-sa/3.0/ license.
Support: Donations can be made from https://wikimediafoundation.org/wiki/Ways_to_Give to support Wikimedia Foundation and knowledge sharing.

Views: 358
Audioversity

This video discussed the 5 x Modes of Operations of Data Encryption Standard ( DES) i.e ECB, CBC, CFB, OFB, Ctr Modes.

Views: 76
Cyber Security Entertainment

DES algo is very important algo in subject Information System Security (ISS). I, Sandeep Upadhyay have explained it by referring three books (Information System Security by William Stallings, Distributed System by A. S. Tanenbaum and Cryptography & Network Security by Atul kahate).

Views: 1284
Sandeep Upadhyay

#askfaizan | #syedfaizanahmad
Block Cipher Modes of Operation | CBC mode | Part 2 https://youtu.be/Q7LKmASkVSU
Hill Cipher | Complete Algorithm with Example https://youtu.be/B0Q7w7Fd7ms
Playfair Substitution Cipher https://youtu.be/w_xr7pj-O6c
Monoalphabetic Substitution Cipher https://youtu.be/Hw1T7GOnVW0
Caesar Cipher | Caesar Substitution Cipher https://youtu.be/2N9GlhysYJw
PlayList : Cryptography and Network Security : https://www.youtube.com/playlist?list=PLhwpdymnbXz7hvvqhqjIIG4tEdhAgQqll
Block cipher processes the data blocks of fixed size
If size of message is larger than block size. Then, the message is divided into a series of sequential message blocks.
Multiple blocks of plaintext are encrypted using the same key, security issues arise.
To apply a block cipher in a variety of applications, five modes of operation have been defined by NIST
1. Electronic Code Book Mode
2. Cipher Block Chaining Mode
3. Output Feedback Mode
4. Cipher Feedback Mode
5. Counter Mode
The simplest mode is the electronic codebook (ECB) mode
Plaintext is handled one block at a time
Each block of plaintext is encrypted using the same key
The ECB mode is deterministic
If plaintext block P1, P2,…, Pm are encrypted twice under the same key, the output ciphertext blocks will be the same.
CBC is technique in which the same plaintext block, if repeated, produces different ciphertext blocks
Each plaintext block is XORed with the ciphertext block that was previously produced
To produce the first block of ciphertext, an initialization vector (IV) is XORed with the first block of plaintext
For decryption, IV data is XORed with first ciphertext block decrypted.

Views: 1386
Ask Faizan