上海交通大学学报(英文版) ›› 2011, Vol. 16 ›› Issue (6): 658-662.doi: 10.1007/s12204-011-1207-3
CHEN Jian-hong (陈剑洪), LONG Yu (龙 宇), CHEN Ke-fei (陈克非) WANG Yong-tao (王永涛),LI Xiang-xue (李祥学)
CHEN Jian-hong (陈剑洪), LONG Yu (龙 宇), CHEN Ke-fei (陈克非) WANG Yong-tao (王永涛),LI Xiang-xue (李祥学)
摘要: To tackle the key-exposure problem in signature settings, this paper introduces a new cryptographic primitive named threshold key-insulated signature (TKIS) and proposes a concrete TKIS scheme.For a TKIS system, at least k out of n helpers are needed to update a user's temporary private key. On the one hand, even if up to k-1 helpers are compromised in addition to the exposure of any of temporary private keys, security of the non-exposed periods is still assured. On the other hand, even if all the n helpers are compromised, we can still ensure the security of all periods as long as none of temporary private keys is exposed. Compared with traditional key-insulated signature (KIS) schemes, the proposed TKIS scheme not only greatly enhances the security of the system, but also provides flexibility and efficiency.
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