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- Hasanzadeh, Mahdi M., et al.
(författare)
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On IV Setup of Pomaranch
- 2006
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Konferensbidrag (refereegranskat)abstract
- 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.
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