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We consider the problem of constructing an unconditionally secure cipher forthe case when the key length is less than the length of the encrypted message.(Unconditional security means that a computationally unbounded adversary cannotobtain information about the encrypted message without the key.) In thisarticle, we propose data compression and randomization techniques combined withentropically-secure encryption. The resulting cipher can be used for encryptionin such a way that the key length does not depend on the entropy or the lengthof the encrypted message; instead, it is determined by the required securitylevel.

Using data compression and randomization to build an unconditionally secure short key cipher