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Perfect ciphers have been a very attractive cryptographic tool ever since C.Shannon described them. Note that, by definition, if a perfect cipher is used,no one can get any information about the encrypted message without knowing thesecret key. We consider the problem of reducing the key length of perfectciphers, because in many applications the length of the secret key is a crucialparameter. This paper describes a simple method of key length reduction. Thismethod gives a perfect cipher and is based on the use of data compression andrandomisation, and the average key length can be made close to Shannon entropy(which is the key length limit). It should be noted that the method caneffectively use readily available data compressors (archivers).

Reduction of the secret key length in the perfect cipher by data compression and randomisation