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Recent years have shown that more than ever governments and intelligenceagencies try to control and bypass the cryptographic means used for theprotection of data. Backdooring encryption algorithms is considered as the bestway to enforce cryptographic control. Implementation backdoors (at theprotocol/implementation/ma\-nagement level) are generally considered. In thispaper we propose to address the most critical issue of backdoors: mathematicalbackdoors or by-design backdoors, which are put directly at the mathematicaldesign of the encryption algorithm. Considering a particular family (among allthe possible ones) of backdoors, we present BSEA-1, a stream cipher algorithmwhich contains a design backdoor enabling an effective cryptanalysis. TheBSEA-1 algorithm uses a 120-bit key. The exploitation of the backdoor enablesto break the cipher with around 2 Kbits of knowplaintext in a few seconds.

BSEA-1 - A Stream Cipher Backdooring Technique