Rip van Winkle cipher

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In cryptography, the Rip van Winkle cipher is a provably secure cipher with a finite key, assuming the attacker has only finite storage.

[edit] Source

J.L. Massey and I. Ingemarsson. The Rip van Winkle cipher - a simple and provably computationally secure cipher with a finite key. In Proc. IEEE Int. Symp. Information Theory (Abstracts), page 146, 1985.