Detailed cost estimation of CNTW attack against EMV signature scheme

Tetsuya Izu, Yoshitaka Morikawa, Yasuyuki Nogami, Yumi Sakemi, Masahiko Takenaka

Research output: Chapter in Book/Report/Conference proceedingConference contribution


EMV signature is one of specifications for authenticating credit and debit card data, which is based on ISO/IEC 9796-2 signature scheme. At CRYPTO 2009, Coron, Naccache, Tibouchi, and Weinmann proposed a new forgery attack against the signature ISO/IEC 9796-2. They also briefly discussed the possibility when the attack is applied to the EMV signatures. They showed that the forging cost is $45,000 and concluded that the attack could not forge them for operational reason. However their results are derived from not fully analysis under only one condition. The condition they adopt is typical case. For security evaluation, fully analysis and an estimation in worst case are needed. This paper shows cost-estimation of CNTW attack against EMV signature in detail. We constitute an evaluate model and show cost-estimations under all conditions that Coron et al. do not estimate. As results, it has become clear that EMV signature can be forged with less than $2,000 according to a condition. This fact shows that CNTW attack might be a realistic threat.

Original languageEnglish
Title of host publicationFinancial Cryptography and Data Security - FC 2011 Workshops, RLCPS and WECSR 2011, Revised Selected Papers
Number of pages14
Publication statusPublished - May 29 2012
Event15th International Conference on Financial Cryptography and Data Security, FC 2011 - St. Lucia, QLD, Australia
Duration: Feb 28 2011Mar 4 2011

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume7126 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349


Other15th International Conference on Financial Cryptography and Data Security, FC 2011
CitySt. Lucia, QLD

ASJC Scopus subject areas

  • Theoretical Computer Science
  • Computer Science(all)


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