Welcome to the resource topic for 2014/793
Title:
Robust Authenticated-Encryption: AEZ and the Problem that it Solves
Authors: Viet Tung Hoang, Ted Krovetz, Phillip Rogaway
Abstract:With a scheme for \textit{robust} authenticated-encryption a user can select an arbitrary value \lambda \ge 0 and then encrypt a plaintext of any length into a ciphertext that’s \lambda characters longer. The scheme must provide all the privacy and authenticity possible for the requested~\lambda. We formalize and investigate this idea, and construct a well-optimized solution, AEZ, from the AES round function. Our scheme encrypts strings at almost the same rate as OCB-AES or CTR-AES (on Haswell, AEZ has a peak speed of about 0.7 cpb). To accomplish this we employ an approach we call \textit{prove-then-prune}: prove security and then instantiate with a \textit{scaled-down} primitive (e.g., reducing rounds for blockcipher calls).
ePrint: https://eprint.iacr.org/2014/793
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