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In the generation method for RSA-moduli proposed by Boneh and Franklin in [BF97] the partial signing servers generate random shares pi, qi and compute as candidate for an RSA-modulus n = pq where p = (∑ pi) and q = (∑ qi). Then they perform a time-consuming distributed primality test which simultaneously checks the primality both of p and q by computing g(p−1)(q−1) = 1 mod n. The primality...
Key recovery is a technology that allows the owner of encrypted data or a trusted third party to recover encrypted data, mostly by reconstructing lost decryption key. In [HLG99], Harn et al proposed a Global Key Recovery System (GKRS) that combines the functions of the key recovery authorities and the public key certification authorities (CAs). Among other features, user-dominance, i.e., a user is...
The LILI-II keystream generator is a LFSR based synchronous stream cipher with a 128 bit key. LILI-II is a specific cipher from the LILI family of keystream generators, and was designed with larger internal components than previous ciphers in this class, in order to provide increased security. The design offers large period and linear complexity, is immune to currently known styles of attack, and...
A commonly used solution for controlling access to information in a multicast group is to encrypt the data using a group key (session key). The group key is only known by users in the group, but not others. A multicast group is dynamic in the sense that group memberships changes in each session. To start a new session, the session key must be updated through a re-keying scheme. In this paper we propose...
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