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The major points in the database are given as: Block Cipher Modes, Newer Mode, Electronic Code Book, Encrypts, Identical Plaintexts, Identical Texts, Encrypted Values, Transmitting, Cipher Block Chaining, Denotes Plaintext
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C (^) i = E(K, P (^) i ⊕ Ci-1 ) for i = 1, 2, …, k
C 1 = E(K, P 1 ⊕ C 0 ) The value C 0 is known as the Initialization Vector or IV
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CBC CTR
Padding needed No padding
No parallel processing Parallel processing
Separate encryption and decryption functions
Encryption function alone is enough Random IV or a nonce Unique nonce
Nonce reuse leaks some information about initial plaintext block
Nonce reuse will leak information about the entire message
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Mode Description Application
OFB Similar to CFB except that the output is fed back
Stream cipher well suited for transmission over noisy channels CTR Key calculated using the nonce and the counter value. Counter is incremented for each block
General purpose block oriented transmission. Used for high-speed communications
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