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Unit 3-Symmetric Key Crypto_Part38

# Unit 3-Symmetric Key Crypto_Part38 - codebook cipher A new...

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Unit 3 - 75 Notation: C=E ( P , K ) Given plaintext P 0 ,P 1 ,…,P m ,… Obvious way to use a block cipher is Encrypt Decrypt C 0 = E(P 0 , K), P 0 = D(C 0 , K), C 1 = E(P 1 , K), P 1 = D(C 1 , K), C 2 = E(P 2 , K),… P 2 = D(C 2 , K),… For a fixed key K , this is an electronic version of a

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Unformatted text preview: codebook cipher A new codebook for each key ECB Mode Unit 3 - 76 ECB Mode Encryption sent sent … … … P E C P 1 E C 1 sent … … … P m E C m...
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Unit 3-Symmetric Key Crypto_Part38 - codebook cipher A new...

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