Cascade Encryption

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Provided by: Comenius University
Topic: Security
Format: PDF
The security of cascade blockcipher encryption is an important and well-studied problem in theoretical cryptography with practical implications. It is well-known that double encryption improves the security only marginally, leaving triple encryption as the shortest reasonable cascade. In a recent paper, the researchers showed that in the ideal cipher model, triple encryption is significantly more secure than single and double encryption, stating the security of longer cascades as an open question. In this paper, the authors propose a new lemma on the in-distinguishability of systems extending Maurer's theory of random systems.
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