On IV Setup of Pomaranch
2006 (English)Conference paper (Refereed)
Pomaranch is a synchronous bit-oriented stream cipher submitted to eSTREAM, the ECRYPT Stream Cipher Project. Following the recently published chosen IV  and correlation  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 . In this paper we use the findings of  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.
ECRYPT Stream Cipher Project, Pomaranch, CJCSG, Jump Register, Cryptanalysis, Linear Equivalence Bias, Clock-Controlled LFSR, Security Evaluation
IdentifiersURN: urn:nbn:se:kth:diva-71033OAI: oai:DiVA.org:kth-71033DiVA: diva2:486459
In State of Art of Stream Ciphers (SASC’06)
QC 201202012012-01-302012-01-302012-02-01Bibliographically approved