IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Online ISSN : 1745-1337
Print ISSN : 0916-8508
Special Section on Cryptography and Information Security
Practical Forgeries and Distinguishers against PAES
Jérémy JEANIvica NIKOLICYu SASAKILei WANG
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2016 Volume E99.A Issue 1 Pages 39-48

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Abstract

We present two practical attacks on the CAESAR candidate PAES. The first attack is a universal forgery for any plaintext with at least 240 bytes. It works for the nonce-repeating variant of PAES and in a nutshell it is a state recovery based on solving differential equations for the S-Box leaked through the ciphertext that arise when the plaintext has a certain difference. We show that to produce the forgery based on this method the attacker needs only 211 time and data. The second attack is a distinguisher for 264 out of 2128 keys that requires negligible complexity and only one pair of known plaintext-ciphertext. The attack is based on the lack of constants in the initialization of the PAES which allows to exploit the symmetric properties of the keyless AES round. Both of our attacks contradict the security goals of PAES.

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© 2016 The Institute of Electronics, Information and Communication Engineers
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