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  4. Can Caesar Beat Galois?
 
conference paper

Can Caesar Beat Galois?

Vaudenay, Serge
•
Vizár, Damian
2018
Lecture Notes in Computer Science
Applied Cryptography and Network Security

The Competition for Authenticated Encryption: Security, Applicability and Robustness (CAESAR) has as its official goal to “identify a portfolio of authenticated ciphers that offer advantages over [the Galois-Counter Mode with AES]” and are suitable for widespread adoption.” Each of the 15 candidate schemes competing in the currently ongoing 3rd round of CAESAR must clearly declare its security claims, i.e. whether it can tolerate nonce misuse, and what is the maximal data complexity for which security is guaranteed. These claims appear to be valid for all 15 candidates. Interpreting “Robustness” in CAESAR as the ability to mitigate damage when security guarantees are void, we describe attacks with 64-bit complexity or above, and/or with nonce reuse for each of the 15 candidates. We then classify the candidates depending on how powerful does an attacker need to be to mount (semi-)universal forgeries, decryption attacks, or key recoveries. Rather than invalidating the security claims of any of the candidates, our results provide an additional criterion for evaluating the security that candidates deliver, which can be useful for e.g. breaking ties in the final CAESAR discussions.

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Type
conference paper
DOI
10.1007/978-3-319-93387-0_25
Author(s)
Vaudenay, Serge
Vizár, Damian
Date Issued

2018

Published in
Lecture Notes in Computer Science
Volume

10892

Start page

476

End page

494

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LASEC  
Event name
Applied Cryptography and Network Security
Available on Infoscience
March 14, 2019
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/155578
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