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Definitions of semantic security

The Programming Works – One-time semantic security. The simplest definition of semantic security is one-time semantic security which naturally applies to stream ciphers: An adversary sends two plaintext messages of equal length to the challenger and receives one encrypted message; semantic security means an adversary can’t distinguish which plaintext message was encrypted. The above is more an intuition than a definition; the strict formal definition involves details not suitable here. In practice a semantically secure stream cipher is as good as perfect one-time pad. The block cipher’s electronic codebook (ECB) ...
Favorite? Off-Topic? Serg @ 2014-02-01 13:25


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