Open AccessImproved Side‐Channel Attack on DES with the First Four Rounds Masked
Author(s) -
Kim Jongsung,
Hong Seokhie,
Han DongGuk,
Lee Sangjin
Publication year - 2009
Publication title -
etri journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 46
eISSN - 2233-7326
pISSN - 1225-6463
DOI - 10.4218/etrij.09.0209.0144
Subject(s) - side channel attack , masking (illustration) , hamming code , channel (broadcasting) , computer science , algorithm , block cipher , arithmetic , mathematics , cryptography , telecommunications , art , decoding methods , visual arts , block code
This letter describes an improved side‐channel attack on DES with the first four rounds masked. Our improvement is based on truncated differentials and power traces which provide knowledge of Hamming weights for the intermediate data computed during the enciphering of plaintexts. Our results support the claim that masking several outer rounds rather than all rounds is not sufficient for the ciphers to be resistant to side‐channel attacks.