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lec-07-aes - CSE565 Computer Security Lecture 7 Advanced...

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9/21/10 UB Fall 2010 CSE565: S. Upadhyaya Lec 7.1 CSE565: Computer Security Lecture 7 Advanced Encryption Standard Shambhu Upadhyaya Computer Science & Eng. University at Buffalo Buffalo, New York, 14260
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9/21/10 UB Fall 2010 CSE565: S. Upadhyaya Lec 7.2 Acknowledgments Material is drawn from Lawrie Brown’s slides
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9/21/10 UB Fall 2010 CSE565: S. Upadhyaya Lec 7.3 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
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9/21/10 UB Fall 2010 CSE565: S. Upadhyaya Lec 7.4 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
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9/21/10 UB Fall 2010 CSE565: S. Upadhyaya Lec 7.5 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)
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9/21/10 UB Fall 2010 CSE565: S. Upadhyaya Lec 7.6 AES Shortlist After testing and evaluation, shortlist in Aug-99:
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