Editing Data Encryption Standard (section)

== Simplified DES ==

Simplified DES (SDES) was designed for educational purposes only, to help students learn about modern cryptanalytic techniques.
SDES has similar structure and properties to DES, but has been simplified to make it much easier to perform encryption and decryption by hand with pencil and paper.
Some people feel that learning SDES gives insight into DES and other block ciphers, and insight into various cryptanalytic attacks against them.<ref>Sanjay Kumar; Sandeep Srivastava.
[http://research.ijcaonline.org/volume104/number2/pxc3899070.pdf "Image Encryption using Simplified Data Encryption Standard (S-DES)"] {{Webarchive|url=https://web.archive.org/web/20151222123315/http://research.ijcaonline.org/volume104/number2/pxc3899070.pdf |date=2015-12-22 }}.
2014.</ref><ref>
Alasdair McAndrew.
[https://books.google.com/books?id=9lTRBQAAQBAJ "Introduction to Cryptography with Open-Source Software"].
2012.
Section "8.8 Simplified DES: sDES".
p. 183 to 190.
</ref><ref>
William Stallings.
[http://mercury.webster.edu/aleshunas/COSC%205130/G-SDES.pdf "Appendix G: Simplified DES"].
2010.
</ref><ref>
Nalini N; G Raghavendra Rao.
[http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.521.9332&rep=rep1&type=pdf "Cryptanalysis of Simplified Data Encryption Standard via Optimisation Heuristics"].
2006.
</ref><ref>
Minh Van Nguyen.
[http://doc.sagemath.org/html/en/reference/cryptography/sage/crypto/block_cipher/sdes.html "Simplified DES"].
2009.
</ref><ref>
Dr. Manoj Kumar.
[https://books.google.com/books?id=jdo6eUKdrVkC "Cryptography and Network Security"].
Section 3.4: The Simplified Version of DES (S-DES).
p. 96.
</ref><ref>
Edward F. Schaefer.
"A Simplified Data Encryption Standard Algorithm".
{{doi|10.1080/0161-119691884799}}
1996.
</ref><ref>
Lavkush Sharma; Bhupendra Kumar Pathak; and Nidhi Sharma.
[http://ijcsi.org/papers/IJCSI-9-3-1-307-313.pdf "Breaking of Simplified Data Encryption Standard Using Binary Particle Swarm Optimization"].
2012.
</ref><ref>
[https://web.archive.org/web/20110829213229/http://www.scu.edu/cas/research/cryptography.cfm "Cryptography Research: Devising a Better Way to Teach and Learn the Advanced Encryption Standard"].
</ref>