S-des Key Generation Method
∟Introduction to DES Algorithm
∟DES Key Schedule (Round Keys Generation) Algorithm
- S-DES is a toy cipher intended for learning, defined by Edward F. Schaefer, A Simplified Data Encryption Standard Algorithm, in Cryptologia Volume 20, Issue 1, 1996 (paywalled with free preview). It has the same structure as DES, and uses the same notations: bits vectors (such as key and data) are numbered starting from 1 'on the left'.
- Nov 21, 2018 S-DES encryption technique with an example S-DES key generation link - https://www.youtube.com/watch?v=zptPrAtfJ1Q&t=11s.
Jun 12, 2019 S-DES Encryption Simplified data encryption standard(S-DES) - Key Generation S- DES key generation - Generation of 2 subkeys from a 10 bit key. Determine another row and column. For this second row, combine bits 5 and 8; for this second column, bits 6 and 7. Identify the entry in s-box S0 at the first row/first column you determined. S0 shows it in decimal; convert it to binary (two bits). Enter those bits as the first half of the 4-bit number at right.
This section describes DES (Data Encryption Standard) algorithm - A 16-round Feistel cipher with block size of 64 bits.
Key schedule algorithm:
DES key schedule supporting tables:
Permuted Choice 1 - PC1:
Permuted Choice 2 - PC2:
Left shifts (number of bits to rotate) - r1, r2, .., r16:
Table of Contents
About This Book
Cryptography Terminology
Cryptography Basic Concepts
Introduction to AES (Advanced Encryption Standard)
►Introduction to DES Algorithm
What Is Block Cipher?
S-des Key Generation Methods
DES (Data Encryption Standard) Cipher Algorithm
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►DES Key Schedule (Round Keys Generation) Algorithm
DES Decryption Algorithm
DES Algorithm - Illustrated with Java Programs
DES Algorithm Java Implementation
DES Algorithm - Java Implementation in JDK JCE
DES Encryption Operation Modes
DES in Stream Cipher Modes
PHP Implementation of DES - mcrypt
Blowfish - 8-Byte Block Cipher
Secret Key Generation and Management
Cipher - Secret Key Encryption and Decryption
Introduction of RSA Algorithm
RSA Implementation using java.math.BigInteger Class
Introduction of DSA (Digital Signature Algorithm)
Java Default Implementation of DSA
Private key and Public Key Pair Generation
PKCS#8/X.509 Private/Public Encoding Standards
Cipher - Public Key Encryption and Decryption
MD5 Mesasge Digest Algorithm
SHA1 Mesasge Digest Algorithm
OpenSSL Introduction and Installation
OpenSSL Generating and Managing RSA Keys
OpenSSL Managing Certificates
OpenSSL Generating and Signing CSR
OpenSSL Validating Certificate Path
'keytool' and 'keystore' from JDK
'OpenSSL' Signing CSR Generated by 'keytool'
Migrating Keys from 'keystore' to 'OpenSSL' Key Files
Certificate X.509 Standard and DER/PEM Formats
Migrating Keys from 'OpenSSL' Key Files to 'keystore'
Using Certificates in IE
Using Certificates in Google Chrome
Using Certificates in Firefox
Outdated Tutorials
References
Full Version in PDF/EPUB
Basic but pure DES implementation in PythonI have written it for fun because nothing else.
How it works ?
Everything is made within a class called 'des'. This class can be instanciated once and used to cipher and decipher multiple datas.It also support padding using the PKCS5 specification. (So the data is padding even if it is multiple of 8 to be sure that the last byte il be padding data).The generation of all the keys used is made in the method generatekeys and substitute apply the SBOX permutation.The main method is run which is called by both encrypt and decrypt but in a different mode. This method do basically all the stuff, it loopthrought all the blocks and for each do the 16th rounds.
Be careful: This module implement DES in ECB mode, so you can't make it weaker. I didn't made it to be strong but for fun.
How to use it ?
I have not done any interface to take argument in command line so this module can't be used as a script. (feel free to modify it).To use it from python shell or in another module do:
S-des Key Generation Method 2017
Note: In this exemple no padding is specified so you have to provide a text which is multiple of 8 bytes. The key is cut to 8 bytes if longer.
Key Generator
To use padding: