C
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Cipher
text block
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DK()
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Decryption algorithm using encryption/decryption key
K
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EK()
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Encryption algorithm using encryption/decryption key
K
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H()
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Hash function
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i
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Block index for n-bit blocks; n is context-dependent
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K
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Cryptographic key
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P
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Plaintext block
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^
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Bitwise exclusive-OR operation (XOR)
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Modulo 2n addition, where n is the bit size of the left-most operand and of the resultant value (e.g., if the left operand is a 1-bit value, and the right operand is a
2-bit value, then: 1 0 = 1; 1 1 = 0; 1 2 = 1; 1 3 = 0; 0 0 = 0; 0 1 = 1; 0 2 = 0; 0 3 = 1)
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Modular multiplication of two polynomials over the binary field GF(2), modulo x128+x7+x2+x+1 (GF stands for Galois Field)
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||
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Concatenation
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