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Proxy signatures, revisited. (English) Zbl 0890.68049
Han, Yongfei (ed.) et al., Information and communications security. 1st international conference, ICICS ’97, Beijing, China, November 11–14, 1997. Proceedings. Berlin: Springer. Lect. Notes Comput. Sci. 1334, 223-232 (1997).
Summary: Proxy signatures, introduced by Mambo, Usuda and Okamoto allow a designated person to sign on behalf of an original signer. This paper first presents two new types of digital proxy signatures called partial delegation with warrant and threshold delegation. Proxy signatures for partial delegation with warrant combines the benefit of Mambo’s partial delegation and Neuman’s delegation by warrant, and then in threshold delegation the proxy signer’s power to sign messages is shared. Moreover, we also propose straightforward and concrete proxy signature schemes satisfying our conditions.
For the entire collection see [Zbl 0877.00018].

68P25 Data encryption (aspects in computer science)
94A60 Cryptography
68M15 Reliability, testing and fault tolerance of networks and computer systems
proxy signature