Eran Richardson

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Skipjack is the secret key encryption algorithm developed by the NSA for the Clipper chip and Fortezza PC card. It uses an 80-bit key, 128 table lookup operations, and 320 XOR operations to map a 64-bit plaintext into a 64-bit ciphertext in 32 rounds. This paper describes an eecient attack on a variant, which we call Skipjack-3XOR (Skipjack minus 3 XORs).(More)
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