NDLI: On the Security of Identity Based Threshold Unsigncryption Schemes

Content Provider	IEEE Xplore Digital Library
Author	Selvi, S.S.D. Vivek, S.S. Rangan, C.P. Priti, S.
Copyright Year	2010
Abstract	Signcryption is a cryptographic primitive that provides confidentiality and authenticity simultaneously at a cost significantly lower than that of the naive combination of encrypting and signing the message. Threshold signcryption is used when a message to be sent needs the authentication of a certain number of members in an organisation, and until and unless a given number of members (known as the threshold) join the signcyption process, a particular message cannot be signcrypted. Threshold unsigncryption is used when this constraint is applicable during the unsigncryption process. In this work, we cryptanalyze two threshold unsigncryption schemes. We show that both these schemes do not meet the stringent requirements of insider security and propose attacks on both confidentiality and unforgeability. We also propose an improved identity based threshold unsigncryption scheme and give the formal proof of security in a new stronger security model.
Starting Page	554
Ending Page	559
File Size	433491
Page Count	6
File Format	PDF
ISBN	9781424484843
DOI	10.1109/NSS.2010.99
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-09-01
Publisher Place	Australia
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Computational modeling Public key Identity Based Cryptography Receivers Bismuth Book reviews Random Oracle Model Self-Proxy Signatures Delegation
Content Type	Text
Resource Type	Article

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