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Our results hold in the multi-user setting as well, constituting the first non-trivial multi-user provable security results on Feistel ciphers. We finally demonstrate applications of our results on de...
Multi-user (mu) security considers large-scale attackers (e.g., state actors) that given access to a number of sessions, attempt to compromise {\em at least} one of them. Mu security of authenticated ...
This paper revisits the multi-user (mu) security of symmetric encryption, from the perspective of delivering an analysis of the AES-GCM-SIV AEAD scheme. Our end result shows that its mu security is co...
By allowing a large number of users to behave as readers or writers, Multi-User Searchable Encryption (MUSE) raises new security and performance challenges beyond the typical requirements of Symmetric...
This paper contributes to understanding the interplay of security notions for PKE, KEMs, and DEMs, in settings with multiple users, challenges, and instances. We start analytically by first studying (...
The keyed duplex construction was introduced by Bertoni et al.(SAC 2011) and recently generalized to full-state absorption by Mennink et al.(ASIACRYPT 2015). We present a generalization of the full-st...
Searchable Encryption (SE) allows a user to upload data to the cloud and to search it in a remote fashion while preserving the privacy of both the data and the queries. Recent research results describ...
It is widely known that double encryption does not substantially increase the security of a block cipher. Indeed, the classical meet-in-the middle attack recovers the 2k2k-bit secret key at the cost o...
We introduce the notion of homomorphic proxy re-authenticators, a tool that adds security and verifiability guarantees to multi-user data aggregation scenarios. It allows distinct sources to authentic...
We initiate the study of multi-user (mu) security of authenticated encryption (AE) schemes as a way to rigorously formulate, and answer, questions about the “randomized nonce” mechanism proposed for...
This paper revisits the concrete security of key-alternating ciphers and key-length extension schemes, with respect to tightness and multi-user security. The best existing bounds on the concrete sec...
Outsourcing data to remote storage servers has become more and more popular, but the related security and privacy concerns have also been raised. To protect the pattern in which a user accesses the ou...
AMAC is a simple and fast candidate construction of a PRF from an MD-style hash function which applies the keyed hash function and then a cheap, un-keyed output transform such as truncation. Spurred...
Three recent proposals for standardization of next-generation ECC signatures have included “key prefixing” modifications to Schnorr’s signature system. Bernstein, Duif, Lange, Schwabe, and Yang stat...
A theorem by Galbraith, Malone-Lee, and Smart (GMLS) from 2002 showed that, for Schnorr signatures, single-user security tightly implies multi-user security. Recently, Bernstein pointed to an error ...

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