On the power of cascade ciphers
ACM Transactions on Computer Systems (TOCS)
Handbook of Applied Cryptography
Handbook of Applied Cryptography
Computers and Intractability: A Guide to the Theory of NP-Completeness
Computers and Intractability: A Guide to the Theory of NP-Completeness
Guesswork and Variation Distance as Measures of Cipher Security
SAC '99 Proceedings of the 6th Annual International Workshop on Selected Areas in Cryptography
CRYPTO '92 Proceedings of the 12th Annual International Cryptology Conference on Advances in Cryptology
Security Amplification by Composition: The Case of Doubly-Iterated, Ideal Ciphers
CRYPTO '98 Proceedings of the 18th Annual International Cryptology Conference on Advances in Cryptology
Ciphers and their products: group theory in private key cryptography
Ciphers and their products: group theory in private key cryptography
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We demonstrate the existence of an efficient block cipher with the property that whenever it is composed with any nonperfect cipher, the resulting product is strictly more secure, against an ideal adversary, than the original cipher. We call this property universal security amplification, and note that it holds trivially for a one-time pad (a stream cipher). However, as far as we are aware, this is the first efficient block cipher with this property. Several practical implications of this result are considered.