In cryptography, a Feistel cipher is a symmetric structure used in the construction of block ciphers, named after the German-born physicist and cryptographer Horst Feistel who did pioneering research while working for IBM (USA); it is also commonly known as a Feistel network. A large proportion of block ciphers use the scheme, including the Data Encryption Standard (DES). The Feistel structure has the advantage that encryption and decryption operations are very similar, even identical in some cases, requiring only a reversal of the key schedule. Therefore the size of the code or circuitry required to implement such a cipher is nearly halved.
A Feistel network is an iterated cipher with an internal function called a round function.
Historical
Feistel networks were first seen commercially in IBM's Lucifer cipher, designed by Horst Feistel and Don Coppersmith in 1973. Feistel networks gained respectability when the U.S. Federal Government adopted the DES (a cipher based on Lucifer, with changes made by the NSA). Like other components of the DES, the iterative nature of the Feistel construction makes implementing the cryptosystem in hardware easier (particularly on the hardware available at the time of DES's design).
Network Security: Feistel Cipher Structure
Topics discussed:
1) Feistel Cipher Structure and explanation of activities.
2) The encryption and decryption process of the Feistel Cipher.
3) Various Design Features of the Feistel Cipher Structure and an explanation of all the Design Features.
4) Explanation of all the Design Features such as Block Size, Key Size, Number of Rounds, Subkey Generation Algorithm, Round Function, Fast Encryption/Decryption Algorithm, and Ease of Analysis.
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published: 07 Aug 2023
Feistel Cipher - Computerphile
One of the most elegant solutions for cryptography. Dr Mike Pound explains one of his most favourite ciphers.
https://www.facebook.com/computerphile
https://twitter.com/computer_phile
This video was filmed and edited by Sean Riley.
Computer Science at the University of Nottingham: https://bit.ly/nottscomputer
Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
published: 19 Feb 2020
Feistel Encoding (Cipher) made easy + step by step example ✅️
#feistel #encoding
By the end of this video you will learn how to do Feistel Encoding (Encryption, Cipher). Do not get discouraged, if needed watch the video a few times and I promise you will understand how it works.
If you have not watched the Feistel Decoding (decryption) video you can do so here:
https://youtu.be/shEr8AcIqvI
Here are the steps for Feistel encoding
step1: Divide the plaintext into two parts, L0 and R0 (L - left, R - right)
step2: R0 is encoded using fs(R0) and the result is stored into E
step3: L1 = R0 and R1 = L0 xor E
step4: concatenate L1 and R1 to obtain the result
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In this video we discussed the procedure of Feistel Cipher structure.
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TOC/Flat:
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python:
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Data Structures:
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published: 29 Jan 2019
Feistel Block Cipher Animation
Shows the basics of a Feistel Block Cipher, which takes a plaintext message input M and a key K to produce a ciphertext C.
published: 16 Mar 2016
Feistel Cipher Structure | Feistel Cipher Encryption Decryption Process
Feistel Cipher Structure | Feistel Cipher Encryption Decryption Process
Follow my blog : https://www.chiragbhalodia.com/2021/09/feistel-cipher-structure.html
In this video, I have explained Feistel Cipher encryption and decryption process has been covered. Also explained working of Feistel Cipher Structure.
Introduction of Feistel Cipher Structure:
Feistel proposed a scheme to produced a block cipher using permutation and substitution alternatively. The inputs to the encryption algorithm are a plaintext block of length 2w bits and a key Ki. The plaintext block is divided into two halves, LE0 and RE0. The two halves of the data pass through rounds of processing and then combine to produce the ciphertext block.
Working of Feistel Cipher Structure
A substitution is performed on the left h...
published: 07 Jul 2020
Feistel Cipher Structure
Feistel proposed the use of a cipher that alternates substitutions and permutations.
1-it is a practical application of a proposal by Claude Shannon to develop a product cipher that alternates confusion and diffusion functions .
2- it is the structure used by many significant symmetric block ciphers currently in use.
Feistel cipher structure steps:
1- The plaintext block is divided into two halves, LE0 and RE0.
2- The two halves of the data pass through n rounds of processing and then combine to produce the ciphertext block.
3- Each round i has as inputs LEi-1 and REi-1 derived from the previous round, as well as a subkey Ki derived from the overall K.
4- In general, the subkeys Ki are different from K and from each other.
All rounds have the same structure.
5- A ...
published: 25 Nov 2020
Cryptography: Feistel Cipher Explained with example شرح بالعربي
Feistel Explained with an example
Feistel cipher شرح بالعربي
published: 25 Oct 2018
Muhammad Farooq-i-Azam: Feistel Cipher Structure Step by Step Simple Example
Feistel cipher structure or Feistel cipher network is the building block of many block ciphers and encryption algorithms using secret key encryption. For example, Feistel cipher structure is used in the symmetric key Data Encryption Algorithm (DEA) used by the Data Encryption Standard (DES).
The Feistel cipher is explained with the help a detailed, easy and step by step example. Both the encryption and decryption processes of the Feistel cipher are explained in the worked example.
Email: [email protected]
#cybersecurity #informationsecurity #encryption #decryption #cryptogratis #cipher #secret #confidential
Information Security: Principles and Practice, 2nd edition, by Mark Stamp
Chapter 3: Symmetric Key Crypto
Sections 3.3-3.3.1
block ciphers, Feistel cipher
Class Lecture, 2011
Network Security: Feistel Cipher Structure
Topics discussed:
1) Feistel Cipher Structure and explanation of activities.
2) The encryption and decryption proces...
Network Security: Feistel Cipher Structure
Topics discussed:
1) Feistel Cipher Structure and explanation of activities.
2) The encryption and decryption process of the Feistel Cipher.
3) Various Design Features of the Feistel Cipher Structure and an explanation of all the Design Features.
4) Explanation of all the Design Features such as Block Size, Key Size, Number of Rounds, Subkey Generation Algorithm, Round Function, Fast Encryption/Decryption Algorithm, and Ease of Analysis.
Follow Neso Academy on Instagram: @nesoacademy (https://bit.ly/2XP63OE)
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Music:
Axol x Alex Skrindo - You [NCS Release]
#NetworkSecurityByNeso #Cryptography #FeistelCipherStructure
Network Security: Feistel Cipher Structure
Topics discussed:
1) Feistel Cipher Structure and explanation of activities.
2) The encryption and decryption process of the Feistel Cipher.
3) Various Design Features of the Feistel Cipher Structure and an explanation of all the Design Features.
4) Explanation of all the Design Features such as Block Size, Key Size, Number of Rounds, Subkey Generation Algorithm, Round Function, Fast Encryption/Decryption Algorithm, and Ease of Analysis.
Follow Neso Academy on Instagram: @nesoacademy (https://bit.ly/2XP63OE)
Contribute: https://www.nesoacademy.org/donate
Memberships: https://bit.ly/2U7YSPI
Books: https://www.nesoacademy.org/recommended-books
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Twitter ► https://twitter.com/nesoacademy
Music:
Axol x Alex Skrindo - You [NCS Release]
#NetworkSecurityByNeso #Cryptography #FeistelCipherStructure
One of the most elegant solutions for cryptography. Dr Mike Pound explains one of his most favourite ciphers.
https://www.facebook.com/computerphile
https://t...
One of the most elegant solutions for cryptography. Dr Mike Pound explains one of his most favourite ciphers.
https://www.facebook.com/computerphile
https://twitter.com/computer_phile
This video was filmed and edited by Sean Riley.
Computer Science at the University of Nottingham: https://bit.ly/nottscomputer
Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
One of the most elegant solutions for cryptography. Dr Mike Pound explains one of his most favourite ciphers.
https://www.facebook.com/computerphile
https://twitter.com/computer_phile
This video was filmed and edited by Sean Riley.
Computer Science at the University of Nottingham: https://bit.ly/nottscomputer
Computerphile is a sister project to Brady Haran's Numberphile. More at http://www.bradyharan.com
#feistel #encoding
By the end of this video you will learn how to do Feistel Encoding (Encryption, Cipher). Do not get discouraged, if needed watch the video a ...
#feistel #encoding
By the end of this video you will learn how to do Feistel Encoding (Encryption, Cipher). Do not get discouraged, if needed watch the video a few times and I promise you will understand how it works.
If you have not watched the Feistel Decoding (decryption) video you can do so here:
https://youtu.be/shEr8AcIqvI
Here are the steps for Feistel encoding
step1: Divide the plaintext into two parts, L0 and R0 (L - left, R - right)
step2: R0 is encoded using fs(R0) and the result is stored into E
step3: L1 = R0 and R1 = L0 xor E
step4: concatenate L1 and R1 to obtain the result
✅️ Join the Facebook group here:
https://www.facebook.com/groups/172936430762975
🔔 Subscribe here:
https://www.youtube.com/channel/UC6l9EdVQyxNmHASZHCDbPZA?sub_confirmation=1
#feistel #encoding
By the end of this video you will learn how to do Feistel Encoding (Encryption, Cipher). Do not get discouraged, if needed watch the video a few times and I promise you will understand how it works.
If you have not watched the Feistel Decoding (decryption) video you can do so here:
https://youtu.be/shEr8AcIqvI
Here are the steps for Feistel encoding
step1: Divide the plaintext into two parts, L0 and R0 (L - left, R - right)
step2: R0 is encoded using fs(R0) and the result is stored into E
step3: L1 = R0 and R1 = L0 xor E
step4: concatenate L1 and R1 to obtain the result
✅️ Join the Facebook group here:
https://www.facebook.com/groups/172936430762975
🔔 Subscribe here:
https://www.youtube.com/channel/UC6l9EdVQyxNmHASZHCDbPZA?sub_confirmation=1
In this video we discussed the procedure of Feistel Cipher structure.
See Complete Playlists:
Network Security OR Cryptography
https://www.youtube.com/playli...
In this video we discussed the procedure of Feistel Cipher structure.
See Complete Playlists:
Network Security OR Cryptography
https://www.youtube.com/playlist?list...
TOC/Flat:
https://www.youtube.com/playlist?list...
Technical Mcqs:
https://www.youtube.com/watch?v=Fxgt5...
Design and analysis of algorithms:
https://www.youtube.com/playlist?list...
python:
https://www.youtube.com/playlist?list...
Data Structures:
https://www.youtube.com/playlist?list...
Advanced Data Structures:
https://www.youtube.com/playlist?list...
Machine Learning:
https://www.youtube.com/playlist?list...
Operating Systems:
https://www.youtube.com/playlist?list...
Java Programming:
https://www.youtube.com/playlist?list...
C++:
https://www.youtube.com/playlist?list...
Programs on c:
https://www.youtube.com/playlist?list...
Computer Graphics:
https://www.youtube.com/playlist?list...
In this video we discussed the procedure of Feistel Cipher structure.
See Complete Playlists:
Network Security OR Cryptography
https://www.youtube.com/playlist?list...
TOC/Flat:
https://www.youtube.com/playlist?list...
Technical Mcqs:
https://www.youtube.com/watch?v=Fxgt5...
Design and analysis of algorithms:
https://www.youtube.com/playlist?list...
python:
https://www.youtube.com/playlist?list...
Data Structures:
https://www.youtube.com/playlist?list...
Advanced Data Structures:
https://www.youtube.com/playlist?list...
Machine Learning:
https://www.youtube.com/playlist?list...
Operating Systems:
https://www.youtube.com/playlist?list...
Java Programming:
https://www.youtube.com/playlist?list...
C++:
https://www.youtube.com/playlist?list...
Programs on c:
https://www.youtube.com/playlist?list...
Computer Graphics:
https://www.youtube.com/playlist?list...
Feistel Cipher Structure | Feistel Cipher Encryption Decryption Process
Follow my blog : https://www.chiragbhalodia.com/2021/09/feistel-cipher-structure.html
...
Feistel Cipher Structure | Feistel Cipher Encryption Decryption Process
Follow my blog : https://www.chiragbhalodia.com/2021/09/feistel-cipher-structure.html
In this video, I have explained Feistel Cipher encryption and decryption process has been covered. Also explained working of Feistel Cipher Structure.
Introduction of Feistel Cipher Structure:
Feistel proposed a scheme to produced a block cipher using permutation and substitution alternatively. The inputs to the encryption algorithm are a plaintext block of length 2w bits and a key Ki. The plaintext block is divided into two halves, LE0 and RE0. The two halves of the data pass through rounds of processing and then combine to produce the ciphertext block.
Working of Feistel Cipher Structure
A substitution is performed on the left half of the data. This is done by applying a round function F to the right half of the data and then taking the exclusive-OR of the output of that function and the left half of the data. The round function has the same general structure for each round but is parameterized by the round subkey Ki. Permutation is performed that consists of the interchange of the two halves of the data. This structure is a particular form of the substitution-permutation network (SPN) proposed by Shannon.
0:00 Introduction
0:30 Introduction of feistel Cipher Structure
3:19 Working of Feistel Cipher Structure
5:53 Encryption & Decryption Diagram of Feistel Cipher
If you like my video contents, please LIKE, COMMENT, SUBSCRIBE & SHARE with your friends.
--------------------------------------------------------------------------------------------------------------
Check out other video on my channel
Block Cipher and Stream Cipher:
https://youtu.be/-gQrm5j0RkQ
Confusion & Diffusion (Frustrated Statistical Analysis or Claud Shannon Properties):
https://youtu.be/PJrW6ZqQipo
Feistel Cipher Structure (to understand DES):
https://youtu.be/emJ0p6h48u4
Data Encryption Standard (DES) Algorithm:
https://youtu.be/cVhlCzmb-v0
DES Example using Animation:
https://youtu.be/3YBwhWuXZ0o
Strength & Weakness of DES, Avalanche effect in DES:
https://youtu.be/Xy1hver_aaw
Advanced Encryption Standard (AES) Algorithm with structure:
https://youtu.be/X8whYEWoDSI
AES Example using Animation:
https://youtu.be/ZPLEtxxjCYA
Key expansion in AES:
https://youtu.be/14SAn4IEAHk
--------------------------------------------------------------------------------------------------------------
You can always connect with me at:
Follow my blog:
https://www.chiragbhalodia.com
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--------------------------------------------------------------------------------------------------------------
Playlist available on my channel:
Network Security (CNS, INS, IS):
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Computer Network (CN) with animation:
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Comupter Organization & Architecture (COA, CA, CO):
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Computer Graphics:
https://youtube.com/playlist?list=PLzQqHxFtQGycg_TJBA6uFGDLwbotjs68h
#chirag_bhalodia
#chiragbhalodia
#networksecurity
#cryptography
#Feistel_Cipher
#Feistel_Cipher_Structure
#Feistel_Cipher_Encryption
#Feistel_Cipher_Decryption
#Working_of_feistel_cipher_structure
Keep learning, keep supporting 🤝✨💯
Feistel Cipher Structure | Feistel Cipher Encryption Decryption Process
Follow my blog : https://www.chiragbhalodia.com/2021/09/feistel-cipher-structure.html
In this video, I have explained Feistel Cipher encryption and decryption process has been covered. Also explained working of Feistel Cipher Structure.
Introduction of Feistel Cipher Structure:
Feistel proposed a scheme to produced a block cipher using permutation and substitution alternatively. The inputs to the encryption algorithm are a plaintext block of length 2w bits and a key Ki. The plaintext block is divided into two halves, LE0 and RE0. The two halves of the data pass through rounds of processing and then combine to produce the ciphertext block.
Working of Feistel Cipher Structure
A substitution is performed on the left half of the data. This is done by applying a round function F to the right half of the data and then taking the exclusive-OR of the output of that function and the left half of the data. The round function has the same general structure for each round but is parameterized by the round subkey Ki. Permutation is performed that consists of the interchange of the two halves of the data. This structure is a particular form of the substitution-permutation network (SPN) proposed by Shannon.
0:00 Introduction
0:30 Introduction of feistel Cipher Structure
3:19 Working of Feistel Cipher Structure
5:53 Encryption & Decryption Diagram of Feistel Cipher
If you like my video contents, please LIKE, COMMENT, SUBSCRIBE & SHARE with your friends.
--------------------------------------------------------------------------------------------------------------
Check out other video on my channel
Block Cipher and Stream Cipher:
https://youtu.be/-gQrm5j0RkQ
Confusion & Diffusion (Frustrated Statistical Analysis or Claud Shannon Properties):
https://youtu.be/PJrW6ZqQipo
Feistel Cipher Structure (to understand DES):
https://youtu.be/emJ0p6h48u4
Data Encryption Standard (DES) Algorithm:
https://youtu.be/cVhlCzmb-v0
DES Example using Animation:
https://youtu.be/3YBwhWuXZ0o
Strength & Weakness of DES, Avalanche effect in DES:
https://youtu.be/Xy1hver_aaw
Advanced Encryption Standard (AES) Algorithm with structure:
https://youtu.be/X8whYEWoDSI
AES Example using Animation:
https://youtu.be/ZPLEtxxjCYA
Key expansion in AES:
https://youtu.be/14SAn4IEAHk
--------------------------------------------------------------------------------------------------------------
You can always connect with me at:
Follow my blog:
https://www.chiragbhalodia.com
Like my Facebook page:
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--------------------------------------------------------------------------------------------------------------
Playlist available on my channel:
Network Security (CNS, INS, IS):
https://youtube.com/playlist?list=PLzQqHxFtQGyfiYWaDnasLdy1JPK3JS06o
Computer Network (CN) with animation:
https://youtube.com/playlist?list=PLzQqHxFtQGycfs9Vn8BYy0ic0wh-oL9UC
VFX Animation & Fun Videos:
https://youtube.com/playlist?list=PLzQqHxFtQGyd9esvf-t5XYOKhxQS0tDWx
Comupter Organization & Architecture (COA, CA, CO):
https://youtube.com/playlist?list=PLzQqHxFtQGyd-uDzS9vov8hJfm03X_SzC
Assembly Language Programming:
https://youtube.com/playlist?list=PLzQqHxFtQGyeTa82xQyceYxaf-iyZBICw
Computer Graphics:
https://youtube.com/playlist?list=PLzQqHxFtQGycg_TJBA6uFGDLwbotjs68h
#chirag_bhalodia
#chiragbhalodia
#networksecurity
#cryptography
#Feistel_Cipher
#Feistel_Cipher_Structure
#Feistel_Cipher_Encryption
#Feistel_Cipher_Decryption
#Working_of_feistel_cipher_structure
Keep learning, keep supporting 🤝✨💯
Feistel proposed the use of a cipher that alternates substitutions and permutations.
1-it is a practical application of a proposal by Claude Shannon to develop...
Feistel proposed the use of a cipher that alternates substitutions and permutations.
1-it is a practical application of a proposal by Claude Shannon to develop a product cipher that alternates confusion and diffusion functions .
2- it is the structure used by many significant symmetric block ciphers currently in use.
Feistel cipher structure steps:
1- The plaintext block is divided into two halves, LE0 and RE0.
2- The two halves of the data pass through n rounds of processing and then combine to produce the ciphertext block.
3- Each round i has as inputs LEi-1 and REi-1 derived from the previous round, as well as a subkey Ki derived from the overall K.
4- In general, the subkeys Ki are different from K and from each other.
All rounds have the same structure.
5- A substitution is performed on the left-half of the data. This is done by applying a round function F to the right-half of the data and then taking the exclusive-OR of the output of that function and the left-half of the data. The round function has the same general structure for each round but is parameterized by the round subkey Ki.
F is a function of right-half block of w bits and a subkey of y bits, which produces an output value of length w bits: F(REi, Ki+1). Following this substitution, a permutation is performed that consists of the interchange/swap of the two halves of the data.
Feistel proposed the use of a cipher that alternates substitutions and permutations.
1-it is a practical application of a proposal by Claude Shannon to develop a product cipher that alternates confusion and diffusion functions .
2- it is the structure used by many significant symmetric block ciphers currently in use.
Feistel cipher structure steps:
1- The plaintext block is divided into two halves, LE0 and RE0.
2- The two halves of the data pass through n rounds of processing and then combine to produce the ciphertext block.
3- Each round i has as inputs LEi-1 and REi-1 derived from the previous round, as well as a subkey Ki derived from the overall K.
4- In general, the subkeys Ki are different from K and from each other.
All rounds have the same structure.
5- A substitution is performed on the left-half of the data. This is done by applying a round function F to the right-half of the data and then taking the exclusive-OR of the output of that function and the left-half of the data. The round function has the same general structure for each round but is parameterized by the round subkey Ki.
F is a function of right-half block of w bits and a subkey of y bits, which produces an output value of length w bits: F(REi, Ki+1). Following this substitution, a permutation is performed that consists of the interchange/swap of the two halves of the data.
Feistel cipher structure or Feistel cipher network is the building block of many block ciphers and encryption algorithms using secret key encryption. For exampl...
Feistel cipher structure or Feistel cipher network is the building block of many block ciphers and encryption algorithms using secret key encryption. For example, Feistel cipher structure is used in the symmetric key Data Encryption Algorithm (DEA) used by the Data Encryption Standard (DES).
The Feistel cipher is explained with the help a detailed, easy and step by step example. Both the encryption and decryption processes of the Feistel cipher are explained in the worked example.
Email: [email protected]
#cybersecurity #informationsecurity #encryption #decryption #cryptogratis #cipher #secret #confidential
Feistel cipher structure or Feistel cipher network is the building block of many block ciphers and encryption algorithms using secret key encryption. For example, Feistel cipher structure is used in the symmetric key Data Encryption Algorithm (DEA) used by the Data Encryption Standard (DES).
The Feistel cipher is explained with the help a detailed, easy and step by step example. Both the encryption and decryption processes of the Feistel cipher are explained in the worked example.
Email: [email protected]
#cybersecurity #informationsecurity #encryption #decryption #cryptogratis #cipher #secret #confidential
Information Security: Principles and Practice, 2nd edition, by Mark Stamp
Chapter 3: Symmetric Key Crypto
Sections 3.3-3.3.1
block ciphers, Feistel cipher
Class...
Information Security: Principles and Practice, 2nd edition, by Mark Stamp
Chapter 3: Symmetric Key Crypto
Sections 3.3-3.3.1
block ciphers, Feistel cipher
Class Lecture, 2011
Information Security: Principles and Practice, 2nd edition, by Mark Stamp
Chapter 3: Symmetric Key Crypto
Sections 3.3-3.3.1
block ciphers, Feistel cipher
Class Lecture, 2011
Network Security: Feistel Cipher Structure
Topics discussed:
1) Feistel Cipher Structure and explanation of activities.
2) The encryption and decryption process of the Feistel Cipher.
3) Various Design Features of the Feistel Cipher Structure and an explanation of all the Design Features.
4) Explanation of all the Design Features such as Block Size, Key Size, Number of Rounds, Subkey Generation Algorithm, Round Function, Fast Encryption/Decryption Algorithm, and Ease of Analysis.
Follow Neso Academy on Instagram: @nesoacademy (https://bit.ly/2XP63OE)
Contribute: https://www.nesoacademy.org/donate
Memberships: https://bit.ly/2U7YSPI
Books: https://www.nesoacademy.org/recommended-books
Website ► https://www.nesoacademy.org/
Forum ► https://forum.nesoacademy.org/
Facebook ► https://goo.gl/Nt0PmB
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Music:
Axol x Alex Skrindo - You [NCS Release]
#NetworkSecurityByNeso #Cryptography #FeistelCipherStructure
One of the most elegant solutions for cryptography. Dr Mike Pound explains one of his most favourite ciphers.
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#feistel #encoding
By the end of this video you will learn how to do Feistel Encoding (Encryption, Cipher). Do not get discouraged, if needed watch the video a few times and I promise you will understand how it works.
If you have not watched the Feistel Decoding (decryption) video you can do so here:
https://youtu.be/shEr8AcIqvI
Here are the steps for Feistel encoding
step1: Divide the plaintext into two parts, L0 and R0 (L - left, R - right)
step2: R0 is encoded using fs(R0) and the result is stored into E
step3: L1 = R0 and R1 = L0 xor E
step4: concatenate L1 and R1 to obtain the result
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In this video we discussed the procedure of Feistel Cipher structure.
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Feistel Cipher Structure | Feistel Cipher Encryption Decryption Process
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In this video, I have explained Feistel Cipher encryption and decryption process has been covered. Also explained working of Feistel Cipher Structure.
Introduction of Feistel Cipher Structure:
Feistel proposed a scheme to produced a block cipher using permutation and substitution alternatively. The inputs to the encryption algorithm are a plaintext block of length 2w bits and a key Ki. The plaintext block is divided into two halves, LE0 and RE0. The two halves of the data pass through rounds of processing and then combine to produce the ciphertext block.
Working of Feistel Cipher Structure
A substitution is performed on the left half of the data. This is done by applying a round function F to the right half of the data and then taking the exclusive-OR of the output of that function and the left half of the data. The round function has the same general structure for each round but is parameterized by the round subkey Ki. Permutation is performed that consists of the interchange of the two halves of the data. This structure is a particular form of the substitution-permutation network (SPN) proposed by Shannon.
0:00 Introduction
0:30 Introduction of feistel Cipher Structure
3:19 Working of Feistel Cipher Structure
5:53 Encryption & Decryption Diagram of Feistel Cipher
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Feistel Cipher Structure (to understand DES):
https://youtu.be/emJ0p6h48u4
Data Encryption Standard (DES) Algorithm:
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Feistel proposed the use of a cipher that alternates substitutions and permutations.
1-it is a practical application of a proposal by Claude Shannon to develop a product cipher that alternates confusion and diffusion functions .
2- it is the structure used by many significant symmetric block ciphers currently in use.
Feistel cipher structure steps:
1- The plaintext block is divided into two halves, LE0 and RE0.
2- The two halves of the data pass through n rounds of processing and then combine to produce the ciphertext block.
3- Each round i has as inputs LEi-1 and REi-1 derived from the previous round, as well as a subkey Ki derived from the overall K.
4- In general, the subkeys Ki are different from K and from each other.
All rounds have the same structure.
5- A substitution is performed on the left-half of the data. This is done by applying a round function F to the right-half of the data and then taking the exclusive-OR of the output of that function and the left-half of the data. The round function has the same general structure for each round but is parameterized by the round subkey Ki.
F is a function of right-half block of w bits and a subkey of y bits, which produces an output value of length w bits: F(REi, Ki+1). Following this substitution, a permutation is performed that consists of the interchange/swap of the two halves of the data.
Feistel cipher structure or Feistel cipher network is the building block of many block ciphers and encryption algorithms using secret key encryption. For example, Feistel cipher structure is used in the symmetric key Data Encryption Algorithm (DEA) used by the Data Encryption Standard (DES).
The Feistel cipher is explained with the help a detailed, easy and step by step example. Both the encryption and decryption processes of the Feistel cipher are explained in the worked example.
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Information Security: Principles and Practice, 2nd edition, by Mark Stamp
Chapter 3: Symmetric Key Crypto
Sections 3.3-3.3.1
block ciphers, Feistel cipher
Class Lecture, 2011
In cryptography, a Feistel cipher is a symmetric structure used in the construction of block ciphers, named after the German-born physicist and cryptographer Horst Feistel who did pioneering research while working for IBM (USA); it is also commonly known as a Feistel network. A large proportion of block ciphers use the scheme, including the Data Encryption Standard (DES). The Feistel structure has the advantage that encryption and decryption operations are very similar, even identical in some cases, requiring only a reversal of the key schedule. Therefore the size of the code or circuitry required to implement such a cipher is nearly halved.
A Feistel network is an iterated cipher with an internal function called a round function.
Historical
Feistel networks were first seen commercially in IBM's Lucifer cipher, designed by Horst Feistel and Don Coppersmith in 1973. Feistel networks gained respectability when the U.S. Federal Government adopted the DES (a cipher based on Lucifer, with changes made by the NSA). Like other components of the DES, the iterative nature of the Feistel construction makes implementing the cryptosystem in hardware easier (particularly on the hardware available at the time of DES's design).