Open AccessGuess‐and‐determine attacks on PANAMA‐like stream ciphers
Author(s) -
Jiao Lin,
Li Yongqiang,
Hao Yonglin
Publication year - 2018
Publication title -
iet information security
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.308
H-Index - 34
eISSN - 1751-8717
pISSN - 1751-8709
DOI - 10.1049/iet-ifs.2017.0553
Subject(s) - stream cipher , computer science , cryptanalysis , cryptography , arithmetic , block cipher , stream cipher attack , slide attack , theoretical computer science , algorithm , mathematics
Guess‐and‐determine attack is a cryptanalysis method that has been applied to various stream ciphers. In this study, the authors study the guess‐and‐determine attacks on two ISO standardised, P anama ‐like stream ciphers: MUGI and Enocoro. Utilising the word‐oriented structure of the two ciphers, they are able to launch heuristic guess‐and‐determine attacks in a more efficient manner. Their first target MUGI is both an ISO standard and a Japanese‐government‐selected CRYPTREC standard. By splitting its basic 64‐bit words into 16‐bit quarter‐words, they are able to conduct a guess‐and‐determine attack with complexity 2 388 , much lower than its 1216‐bit internal state size. Enocoro is a lightweight stream cipher family. It has two versions named according to key‐length as Enocoro‐80 and Enocoro‐128v2. They provide the specific guessing paths and they are able to launch guess‐and‐determine attacks on Enocoro‐80 and Enocoro‐128v2 with complexities 2 88 and 2 144 , respectively. In addition to specific attacking results, they also find some generic rules that may help to improve the efficiency of guess‐and‐determine attacks in the future.