Welcome to the resource topic for 2014/206
Title:
Reconsidering Generic Composition
Authors: Chanathip Namprempre, Phillip Rogaway, Thomas Shrimpton
Abstract:In the context of authenticated encryption (AE), generic composition has referred to the construction of an AE scheme by gluing together a conventional (privacy-only) encryption scheme and a MAC. Since the work of Bellare and Namprempre (2000) and then Krawczyk (2001), the conventional wisdom has become that there are three forms of generic composition, with Encrypt-then-MAC the only one that generically works. However, many caveats to this understanding have surfaced over the years. Here we explore this issue further, showing how this understanding oversimplifies the situation because it ignores the results’ sensitivity to definitional choices. When encryption is formalized differently, making it either IV-based or nonce-based, rather than probabilistic, and when the AE goal is likewise changed to take in a nonce, qualitatively different results emerge. We explore these alternatives versions of the generic-composition story. We also evidence the overreaching understanding of prior generic-composition results by pointing out that the Encrypt-then-MAC mechanism of ISO 19772 is completely wrong.
ePrint: https://eprint.iacr.org/2014/206
See all topics related to this paper.
Feel free to post resources that are related to this paper below.
Example resources include: implementations, explanation materials, talks, slides, links to previous discussions on other websites.
For more information, see the rules for Resource Topics .