Unit 3-Symmetric Key Crypto_Part37

Unit 3-Symmetric Key Crypto_Part37 - ECB ) mode Obvious...

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Unit 3 - 73 Multiple Blocks How to encrypt multiple blocks? A new key for each block? As bad as (or worse than) a one-time pad! Encrypt each block independently? Make encryption depend on previous block(s), i.e., “chain” the blocks together? How to handle partial blocks?
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Unit 3 - 74 Many modes of operation we discuss three Electronic Codebook (
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Unformatted text preview: ECB ) mode Obvious thing to do Encrypt each block independently There is a serious weakness Cipher Block Chaining ( CBC ) mode Chain the blocks together More secure than ECB, virtually no extra work Counter Mode ( CTR ) mode Acts like a stream cipher Popular for random access Modes of Operation...
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This note was uploaded on 03/17/2011 for the course ECE 4472 taught by Professor Ouda during the Fall '10 term at UWO.

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Unit 3-Symmetric Key Crypto_Part37 - ECB ) mode Obvious...

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