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On IV Setup of Pomaranch
Zaeim Electronic Industries Company, Tehran, Iran.
Zaeim Electronic Industries Company, Tehran, Iran.
The Selmer Center, University of Bergen, Bergen, Norway.
2006 (English)Conference paper, Published paper (Refereed)
Abstract [en]

Pomaranch is a synchronous bit-oriented stream cipher submitted to eSTREAM, the ECRYPT Stream Cipher Project. Following the recently published chosen IV [1] and correlation [7] key-recovery attacks, the authors changed the configuration of jump registers and introduced two new key-IV setup procedures for the cipher. We call the updated version as Tweaked Pomaranch vs. Original Pomaranch [4]. In this paper we use the findings of [7] to mount a chosen IV key-recovery attack on the Original Pomaranch with computational complexity of O(273.5). The attack is also applicable to the first key-IV setup proposal for Tweaked Pomaranch with computational complexity of O(2 117.7).  The alternative key-IV setup for Tweaked Pomaranch is immune against our attack. Both versions of Pomaranch deal with 128 bit keys.

Place, publisher, year, edition, pages
2006. 7-12 p.
Keyword [en]
ECRYPT Stream Cipher Project, Pomaranch, CJCSG, Jump Register, Cryptanalysis, Linear Equivalence Bias, Clock-Controlled LFSR, Security Evaluation
National Category
Computer Science
Identifiers
URN: urn:nbn:se:kth:diva-71033OAI: oai:DiVA.org:kth-71033DiVA: diva2:486459
Conference
In State of Art of Stream Ciphers (SASC’06)
Note
QC 20120201Available from: 2012-01-30 Created: 2012-01-30 Last updated: 2012-02-01Bibliographically approved

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