Open AccessComment on ‘Targeted Ciphers for Format‐Preserving Encryption’ from Selected Areas in Cryptography 2018
Author(s) -
Wang Dachao,
Wang Baocang,
Ping Yuan
Publication year - 2021
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/ise2.12028
Subject(s) - cryptography , computer science , encryption , block cipher , theoretical computer science , key schedule , differential cryptanalysis , computer security
Format‐preserving encryption (FPE) allows encrypting plaintexts while preserving a specific format. In Selected Areas in Cryptography 2018, two targeted ciphers were proposed as new FPE schemes. The second scheme was designed with an algorithm called Mix–Swap–Unmix that is shown to be equivalent to a particular matching exchange process under a specific setting. In this comment paper, we prove that the matching exchange process is invalid. As a result, this equivalence does not exist.