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EUROCRYPT
2010
Springer

Cryptographic Agility and Its Relation to Circular Encryption

9 years 4 months ago
Cryptographic Agility and Its Relation to Circular Encryption
We initiate a provable-security treatment of cryptographic agility. A primitive (for example PRFs, authenticated encryption schemes or digital signatures) is agile when multiple, individually secure schemes can securely share the same key. We provide a surprising connection between two seemingly unrelated but challenging questions. The first, new to this paper, is whether wPRFs (weak-PRFs) are agile. The second, already posed several times in the literature, is whether every secure (IND-R) encryption scheme is secure when encrypting cycles. We resolve the second question in the negative and thereby the first as well. We go on to provide a comprehensive treatment of agility, with definitions for various different primitives. We explain the practical motivations for agility. We provide foundational results that show to what extent it is achievable and practical constructions to achieve it to the best extent possible. On the theoretical side our work uncovers new notions and relation...
Tolga Acar, Mira Belenkiy, Mihir Bellare, David Ca
Added 19 Jul 2010
Updated 19 Jul 2010
Type Conference
Year 2010
Where EUROCRYPT
Authors Tolga Acar, Mira Belenkiy, Mihir Bellare, David Cash
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