1. History Applications Attacks Advantages & Disadvantages Conclusion

2. Based on Rijndael algorithm Designed by Vincent Rijmen and Joan Daemen Successor of DES ( Why not Triple-DES )Triple-DES 128-bit key minimum

3. 15 different designs 5 final nominees Rijndael (86 positive, 10 negative) Serpent (59 positive, 7 negative) Twofish (31 positive, 21 negative) RC6 (23 positive, 37 negative) MARS (13 positive, 83 negative)

4. A standard by NIST Archive and compression tools Disk encryption Local Area Network security Programming language C : Cryptography API C++: Botan, Crypto++ Java: Java Cryptography Extension (JCE) A standard by NIST Archive and compression tools Disk encryption Local Area Network security Programming language C : Cryptography API C++: Botan, Crypto++ Java: Java Cryptography Extension (JCE) On June 2003, AES 128-bit was approved for SECRET level document, and AES 256-bit approved for “TOP SECRET” level

5. Side channel attack Power analysis Timing analysis Fault analysis Acoustic analysis Radiation analysis (TEMPEST) Exhaustive search (Brute force attack) XSL attack ( Extended Sparse Linearization )

6. Published in 2002 Requiring fewer known plaintext Faster than an exhaustive search No real-world implementation “no one knows for certain if XSL can break Rijndael, and no one knows for certain that XSL cannot break Rijndael either..” Bruce Schneier, Twofish designer

7. Advantages Safe Brute Force (128 Bit = 2 128 attempts) Unbreakable, for now.. Disadvantages Too simple algebraic structure

9. Will be used until there is any indication that the cipher system could be broken. Safe for now..

10. [1] AES : http://en.wikipedia.org/wiki/Advanced_Encryption_Standardhttp://en.wikipedia.org/wiki/Advanced_Encryption_Standard [2] WinZip AES Encryption Information: http://www.winzip.com/aes_info.htmhttp://www.winzip.com/aes_info.htm [3] AES Implementations: http://en.wikipedia.org/wiki/AES_implementationshttp://en.wikipedia.org/wiki/AES_implementations [4] Cryptosystem: http://www.cryptosystem.net/aes/http://www.cryptosystem.net/aes/ [5] AES Animations: http://www.cs.bc.edu/~straubin/cs381- 05/blockciphers/rijndael_ingles2004.swfhttp://www.cs.bc.edu/~straubin/cs381- 05/blockciphers/rijndael_ingles2004.swf [6] XSL Attack: http://en.wikipedia.org/wiki/XSL_attackhttp://en.wikipedia.org/wiki/XSL_attack

11. Thank you for your attention!

12. Very slow in software Unsuitable in limited resources platform Only 64 bits block size Back