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Delegated multisignature scheme with document decomposition
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DOI：10.1016/S0164-1212(00)00080-7.png)
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Consider the case that a large document including different subjects can be decomposed into a disjoint set of subdocuments and is to be delegated to a group of signatories with different knowledge domains for signing. Based on the intractability of the discrete logarithm problem, the authors propose a novel multisignature scheme, namely the delegated multisignature scheme in which each qualified signatory only signs a subset of the set of subdocuments according to the justification that his/her knowledge domain completely covers these delegated subdocuments' subjects. Meanwhile, any verifier can verify the multisignature of the document with only knowing the group's public key, i.e., the multisignature verification key, not necessarily to know the results regarding document decomposition and subdocument delegation. The proposed scheme has the merit that the size of the subdocuments delegated to the qualified signatories can be further reduced and as balanced as possible. Besides, the proposed scheme is more realistic to practical aspects for multisignature construction and requires smaller communication bandwidth as compared to conventional multisignature schemes. (C) 2001 Elsevier Science Inc. All rights reserved.
Keyword:
digital signature
multisignature
delegated multisignature
discrete logarithm
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