lec-05 - 1 9/15/09 UB Fall 2009 CSE565: S. Upadhyaya Lec...

Info iconThis preview shows pages 1–4. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 1 9/15/09 UB Fall 2009 CSE565: S. Upadhyaya Lec 5.1 CSE565: Computer Security Lecture 5 Advanced Encryption Standard Shambhu Upadhyaya Computer Science & Eng. University at Buffalo Buffalo, New York, 14260 9/15/09 UB Fall 2009 CSE565: S. Upadhyaya Lec 5.2 Acknowledgments Material is drawn from Lawrie Browns slides 2 9/15/09 UB Fall 2009 CSE565: S. Upadhyaya Lec 5.3 Origins A replacement for DES was needed because DES is subject to theoretical attacks that can break it exhaustive key search attacks One could use Triple-DES but slow with small blocks US NIST issued call for ciphers in 1997 15 candidates accepted in Jun 98 5 were short-listed in Aug-99 Rijndael was selected as the AES in Oct-2000 Issued as FIPS PUB 197 standard in Nov-2001 9/15/09 UB Fall 2009 CSE565: S. Upadhyaya Lec 5.4 AES Requirements Private key symmetric block cipher 128-bit data, 128/192/256-bit keys Stronger & faster than Triple-DES Active life of 20-30 years (+ archival use) Provide full specification & design details Both C & Java implementations NIST have released all submissions & unclassified analyses 3 9/15/09 UB Fall 2009 CSE565: S. Upadhyaya Lec 5.5 AES Evaluation Criteria Initial criteria: security effort to practically cryptanalyze cost computational algorithm & implementation characteristics Final criteria general security software & hardware implementation ease implementation attacks flexibility (in en/decrypt, keying, other factors) 9/15/09 UB Fall 2009 CSE565: S. Upadhyaya Lec 5.6 AES Shortlist...
View Full Document

This document was uploaded on 09/17/2010.

Page1 / 10

lec-05 - 1 9/15/09 UB Fall 2009 CSE565: S. Upadhyaya Lec...

This preview shows document pages 1 - 4. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online