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Search results “Linear feedback shift register cryptography and network”
LFSR 1
 
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An introduction to linear feedback shift registers, and their use in generating pseudorandom numbers for Vernam ciphers. For more cryptography, subscribe to my channel: https://www.youtube.com/channel/UC1KV5WfubHTV6E7sVCnTidw
Views: 33568 Jeff Suzuki
Digital Logic - Linear Feedback Shift Register
 
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This is another video in my series of videos where I talk about Digital Logic. In this video, I show how you can make a Linear Feedback Shift Register, which is a circuit that allows you to generate pseudo-random numbers.
Views: 41870 Robot Brigade
Lecture 4: Stream Ciphers and Linear Feedback Shift Registers by Christof Paar
 
01:29:40
For slides, a problem set and more on learning cryptography, visit www.crypto-textbook.com
Linear Feedback Shift Register
 
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LFSR sequential Design through equation
Views: 20050 Muhammad Awais Shaikh
Linear Feedback Shift Register - Explained
 
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Explaining the Shift Register Schematic:http://www.mediafire.com/?pq8jo5rz66s7r3y
Views: 3007 James Tumber
Lfsr help
 
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Views: 3208 Patrick Duncan
PRNG Part 1
 
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Part 1 of a 3 part lesson on Pseudo Random Number Generators (PRNGs)
Coding Math: Episode 51 - Pseudo Random Number Generators Part I
 
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Back to School Special. This short series will discuss pseudo random number generators (PRNGs), look at how they work, some algorithms for PRNGs, and how they are used. Support Coding Math: http://patreon.com/codingmath Source Code: https://jsbin.com/nifutup/1/edit?js,output Earlier Source Code: http://github.com/bit101/codingmath
Views: 28532 Coding Math
CRC - Cyclic Redundancy Check
 
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Learn what the CRC is, the technology behind it, and how it's performed.
Views: 41993 Wisc-Online
Applied Cryptography: Stream Ciphers (1/3)
 
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Previous video: https://youtu.be/jRhoT1CSZQE Next video: https://youtu.be/DA8f8FHuE9I
Views: 8758 Leandro Junes
Pseudo-Random Sequencer
 
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Creates a 127 bit long random sequence that repeats. Uses a 555, 7404, 7487, and 74164 Read the rest of this post on my blog: http://kennethfinnegan.blogspot.com/2010/01/design-project-zombie-tag-repeller.html
Views: 1377 Kenneth Finnegan
CSE571-11-07: Pseudorandom Number Generation and Stream Ciphers
 
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Audio/Video Recording of Professor Raj Jain's class lecture on Pseudorandom Number Generation and Stream Ciphers. It covers Pseudo Random Numbers, A Sample Generator, Terminology, Linear-Congruential Generators, Blum Blum Shub Generator, Random & Pseudorandom Number Generators, Using Block Ciphers as PRNGs, ANSI X9.17 PRG, Natural Random Noise, Stream Ciphers, RC4, RC4 Key Schedule, RC4 Encryption, RC4
Views: 4952 Raj Jain
Lec-34 Testing Part-V
 
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Lecture Series on Electronic Design and Automation by Prof.I.Sengupta, Department of Computer Science and Engineering, IIT Kharagpur. For more details on NPTEL visit http://nptel.iitm.ac.in
Views: 7952 nptelhrd
[Minetest] Linear Feedback Shift Register
 
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Just a simple linear feedback shift register (pseudorandom number generator) put together from stock mesecons parts. Could easily be made more efficient (fewer parts), but meh. The feedback network in use is 1 = 11 xor (13 xor (14 xor 16)).
Views: 83 April Kolwey
A5 Example A 5 1 Bar with Flexible Supports
 
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A statically indeterminate, rigid bar with flexible rods as two of the supports is analyzed. The system is indeterminate to the first degree and is associated with axially loaded systems.
Views: 18 Doug Schmucker
introduction to practical cryptography
 
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Subscribe today and give the gift of knowledge to yourself or a friend introduction to practical cryptography Introduction to Practical Cryptography. Lectures 3/4 Stream Ciphers. Agenda. Properties Building Blocks Competitions Examples. Uses. Encryption of streaming data Random bit generation. Stream Ciphers. Stream cipher outputs keystream, KS Slideshow 3093083 by kermit show1 : Introduction to practical cryptography show2 : Agenda show3 : Introduction to practical cryptography show4 : Stream ciphers show5 : Stream ciphers1 show6 : Stream ciphers2 show7 : Stream ciphers general concept show8 : Stream ciphers general concept1 show9 : Keystream properties show10 : Agenda1 show11 : Stream ciphers approaches show12 : Feedback shift register show13 : Feedback shift registers show14 : Variations utilizing lfsr show15 : Variations utilizing lfsr1 show16 : Clock control examples show17 : Clock control examples1 show18 : Agenda2 show19 : Nessie stream cipher submissions show20 : Ecrypt s estream contest show21 : Estream overview show22 : Estream evaluation show23 : Estream phase 3 candidates show24 : Estream winners show25 : Agenda3 show26 : Stream cipher examples show27 : Introduction to practical cryptography show28 : Introduction to practical cryptography show29 : Introduction to practical cryptography show30 : Introduction to practical cryptography show31 : A5 1 lsrfs
Views: 54 slideshow this
maximal length LFSR quik tst part2
 
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maximal length linear feedback shift register thingy, with programmable feedback taps, fallout from a cryptography lab (shhhh!). output is processed into analogue computer module. with random prodding from one of the feedback taps
Views: 166 noyzelab
maximal length LFSR quik tst part1
 
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maximal length linear feedback shift register thingy, with programmable feedback taps, fallout from a cryptography lab (shhhh!). output is processed into analogue computer module. with random prodding from one of the feedback taps
Views: 234 noyzelab
Image Encryption and Decryption using Chaotic Key Sequence
 
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Image Encryption and Decryption using Chaotic Key Sequence Generated by Sequence of Logistic Map and Sequence of States of Linear Feedback Shift Register This video project is done by: Potcharaphol Chat-anan (Aung) Tan Wei Jie, Chester Feng Wei Nicholas Koh Ming Xuan Jonathan Liem Zhuan Kim Chia Su Chi Faith
Views: 13135 Potcharaphol Chat-anan
What is SHRINKING GENERATOR? What does SHRINKING GENERATOR mean?
 
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What is SHRINKING GENERATOR? What does SHRINKING GENERATOR mean? Source: Wikipedia.org article, adapted under https://creativecommons.org/licenses/by-sa/3.0/ license. In cryptography, the shrinking generator is a form of pseudorandom number generator intended to be used in a stream cipher. It was published in Crypto 1993 by Don Coppersmith, Hugo Krawczyk, and Yishay Mansour. The shrinking generator uses two linear feedback shift registers. One, called the A sequence, generates output bits, while the other, called the S sequence, controls their output. Both A and S are clocked; if the S bit is 1, then the A bit is output; if the S bit is 0, the A bit is discarded, nothing is output, and we clock the registers again. This has the disadvantage that the generator's output rate varies irregularly, and in a way that hints at the state of S; this problem can be overcome by buffering the output. Despite this simplicity, there are currently no known attacks better than exhaustive search when the feedback polynomials are secret. If the feedback polynomials are known, however, the best known attack requires less than A•S bits of output. An interesting variant is the self-shrinking generator.
Views: 157 The Audiopedia
Chapter 3, part 1: Symmetric Key Crypto --- stream ciphers, A5/1, shift registers
 
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Information Security: Principles and Practice, 2nd edition, by Mark Stamp Chapter 3: Symmetric Key Crypto Sections 3.1-3.2.1 stream ciphers, A5/1, shift registers Class Lecture, 2011
Views: 28666 Mark Stamp
Stream Ciphers
 
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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: 7464 nptelhrd
Stream Cipher.
 
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Views: 8980 Internetwork Security
LFSR reseeding scheme for achieving test coverage
 
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www.takeoffprojects.com For Details Contact A Vinay :- 9030333433
Views: 84 takeoff edu
Pseudo Random Number Generators (CSS441, L08, Y15)
 
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True and pseudo random numbers; Linear Congruential Generator. Course material via: http://sandilands.info/sgordon/teaching
Views: 3441 Steven Gordon
شرح stream cipher
 
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شرح عمليات التشفير علي مستوي النبضات بشكل منفرد
Views: 5299 missra mansour
Cryptography  attacks on stream ciphers and the one time pad
 
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Cryptography attacks on stream ciphers and the one time pad To get certificate subscribe: https://www.coursera.org/learn/crypto Playlist URL: https://www.youtube.com/playlist?list=PL2jykFOD1AWYosqucluZghEVjUkopdD1e About this course: Cryptography is an indispensable tool for protecting information in computer systems. In this course you will learn the inner workings of cryptographic systems and how to correctly use them in real-world applications. The course begins with a detailed discussion of how two parties who have a shared secret key can communicate securely when a powerful adversary eavesdrops and tampers with traffic. We will examine many deployed protocols and analyze mistakes in existing systems. The second half of the course discusses public-key techniques that let two parties generate a shared secret key.
Views: 568 intrigano
Modes of Block Cipher - Output Feedback Mode
 
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This presentation video shows the working process of the Output feedback mode's Encryption and Decryption process.
Views: 1143 Bryan Loh
Stream Ciphers (Contd...2)
 
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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: 4324 nptelhrd
Pseudo Random Number Generator - Applied Cryptography
 
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This video is part of an online course, Applied Cryptography. Check out the course here: https://www.udacity.com/course/cs387.
Views: 9295 Udacity
Applied Cryptography: Stream Ciphers (3/3)
 
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Previous video: https://youtu.be/DA8f8FHuE9I Next video: https://youtu.be/6ro3z2pTiqI
Views: 2528 Leandro Junes
Output Feedback Mode
 
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Output Feedback Mode
Views: 1145 Chris Lee
Output Feedback Mode Solution - Applied Cryptography
 
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This video is part of an online course, Applied Cryptography. Check out the course here: https://www.udacity.com/course/cs387.
Views: 2359 Udacity
A5/1 STREAM CIPHER in GSM cellular networks - animation of how it works
 
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This is animation of the principle of A5/1 stream cipher used to provide over-the-air communication privacy in the GSM cellular telephone standard. It is one of seven algorithms which were specified for GSM use. A5/1 is used in Europe and the United States. A5/1 was developed in 1987, initially kept secret, the general design was leaked in 1994 and the algorithms were entirely reverse engineered in 1999 by Marc Briceno from a GSM telephone.
Views: 34175 Jirka Matousek
Padding Solution - Applied Cryptography
 
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This video is part of an online course, Applied Cryptography. Check out the course here: https://www.udacity.com/course/cs387.
Views: 1620 Udacity
Stream Ciphers - Encryption/Decryption
 
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A beginner's guide to Stream Ciphers (Encryption/Decryption).
Views: 56631 Daniel Rees
Stream Ciphers (Contd...1)
 
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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: 5470 nptelhrd
Output Feedback Mode
 
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Output Feedback Mode (OFB) is one of the block cipher mode used in cryptography.
Views: 377 Joawin Cheong
Cryptography - Output Feedback Mode
 
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This video is explains about the process of output feedback mode.
Views: 70 Calven Wong
TRIVIUM CIPHER DESIGN - AREA OPTIMISED
 
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This project describes the minimized area hardware implementation of the Trivium Cipher based on the Shift register connected in Serial manner. The design was simulated using Xilinx ISE (Isim) to verify the correctness of the system. Also, it is synthesized using Composer Schematic for 130nm CMOS technology. The aim of the project is to reduce the area utilized by the Trivium Cipher. The shift registers are implemented using D flip flop with asynchronous reset input. The logic of D flip flop used for implementation is True Single Phase Clock type. The key stream generation consists of an iterative process which extracts the values of 15 specific state bits and uses them both to update 3 bits of the state and to compute 1 bit of key stream zi. The state bits are then rotated and the process repeats itself until the required 264 bits of key stream is generated.
What is DIGITAL SIGNATURE TRANSPONDER? What does DIGITAL SIGNATURE TRANSPONDER mean?
 
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What is DIGITAL SIGNATURE TRANSPONDER? What does DIGITAL SIGNATURE TRANSPONDER mean? DIGITAL SIGNATURE TRANSPONDER meaning - DIGITAL SIGNATURE TRANSPONDER definition - DIGITAL SIGNATURE TRANSPONDER explanation. Source: Wikipedia.org article, adapted under https://creativecommons.org/licenses/by-sa/3.0/ license. SUBSCRIBE to our Google Earth flights channel - https://www.youtube.com/channel/UC6UuCPh7GrXznZi0Hz2YQnQ The Texas Instruments digital signature transponder (DST) is a cryptographically enabled radio-frequency identification (RFID) device used in a variety of wireless authentication applications. The largest deployments of the DST include the Exxon-Mobil Speedpass payment system (approximately 7 million transponders), as well as a variety of vehicle immobilizer systems used in many late model Ford, Lincoln, Mercury, Toyota, and Nissan vehicles. The DST is an unpowered "passive" transponder which uses a proprietary block cipher to implement a challenge-response authentication protocol. Each DST tag contains a quantity of non-volatile RAM, which stores a 40-bit encryption key. This key is used to encipher a 40-bit challenge issued by the reader, producing a 40-bit ciphertext, which is then truncated to produce a 24-bit response transmitted back to the reader. Verifiers (who also possess the encryption key) verify this challenge by computing the expected result and comparing it to the tag response. Transponder encryption keys are user programmable, using a simple over-the-air protocol. Once correctly programmed, transponders may be "locked" through a separate command, which prevents further changes to the internal key value. Each transponder is factory provisioned with a 24-bit serial number and 8-bit manufacturer code. These values are fixed, and cannot be altered. Until 2005, the DST cipher (DST40) was a trade secret of Texas Instruments, made available to customers under non-disclosure agreement. This policy was likely instituted due to the cipher's non-standard design and small key size, which rendered it vulnerable to brute-force keysearch. In 2005, a group of students from the Johns Hopkins University Information Security Institute and RSA Laboratories reverse-engineered the cipher using an inexpensive Texas Instruments evaluation kit, through schematics of the cipher leaked onto Internet, and black-box techniques (i.e., querying transponders via the radio interface, rather than dismantling them to examining the circuitry). Once the cipher design was known, the team programmed several FPGA devices to perform brute-force key searches based on known challenge/response pairs. Using a single FPGA device, the team was able to recover a key from two known challenge/response pairs in approximately 11 hours (average case). With an array of 16 FPGA devices, they reduced this time to less than one hour. DST40 is a 200-round unbalanced Feistel cipher, in which L0 is 38 bits, and R0 is 2 bits. The key schedule is a simple linear feedback shift register, which updates every three rounds, resulting in some weak keys (e.g., the zero key). Although the cipher is potentially invertible, the DST protocol makes use of only the encipher mode. When used in the protocol with the 40–24-bit output truncation, the resulting primitive is more aptly described as a Message Authentication Code rather than an encryption function. Although a truncated block cipher represents an unusual choice for such a primitive, this design has the advantage of precisely bounding the number of collisions for every single key value. The DST40 cipher is one of the most widely used unbalanced Feistel ciphers in existence. The vulnerability exposed by the Hopkins team indicates potential security threats to millions of vehicles which are protected using DST-based immobilizer systems, and to the Exxon-Mobil Speedpass system. The ideal solution to this problem is to replace the DST transponder in these systems with a device provisioned with a more robust cryptographic circuit utilizing a longer key length. However, the cost of recalling these security systems is prohibitively high, and-- as of October 2005-- neither Texas Instruments, Exxon-Mobil or any vehicle manufacturer has announced such a recall. Currently the most effective protections against this attack rely on user vigilance, e.g., protecting transponder keys, auditing Speedpass invoices for fraud, and optionally using a metallic shield (such as aluminum foil) to prevent unauthorized scanning of DST tags. This vulnerability has also spawned the creation of the RSA Blocker Tag and RFID Blocking Wallets.
Views: 64 The Audiopedia
XOR Operator
 
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The XOR (Exclusive OR) operator is used extensively in cryptography. It returns TRUE if and only if exactly one of your input values is TRUE. It acts as a toggle. XOR something and then XOR it again to reverse the original XOR. Our homepage: https://plaincipher.org