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Unit 3-Symmetric Key Crypto_Part39

Unit 3-Symmetric Key Crypto_Part39 - 2 Decrypts as Money...

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Unit 3 - 77 Suppose plaintext is Money ⌂for⌂Alice⌂is⌂\$1000 Money ⌂for⌂Trudy⌂is⌂\$2⌂⌂⌂ where is a a blank space Assuming 64-bit blocks and 8-bit ASCII: P 0 = Money ⌂fo P 1 = r ⌂Alice⌂ P 2 = is ⌂\$1000 P 3 = Money ⌂fo P 4 = r ⌂Trudy⌂ P 5 = is ⌂\$2⌂⌂⌂ Ciphertext: C 0 , C 1 , C 2 , C 3 , C 4 , C 5 Trudy cuts and pastes: C 0 , C 1 , C 5 , C 3 , C 4 , C

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Unformatted text preview: 2 Decrypts as Money for Alice is \$2 Money for Trudy is \$1000 ECB Cut and Paste Attack Unit 3 - 78 ECB Weakness Suppose P i = P j Then C i = C j and Trudy knows P i = P j This gives Trudy some information, even if she does not know P i or P j Trudy might know P i Is this a serious issue?...
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Unit 3-Symmetric Key Crypto_Part39 - 2 Decrypts as Money...

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