CRYPTANALYSIS OF A DYNAMIC THRESHOLD DECRYPTION SCHEME
نویسندگان
چکیده
منابع مشابه
A Dynamic Threshold Decryption Scheme Using Bilinear Pairings
A dynamic threshold sharing scheme is one that allows the set of participants to expand and contract. In this work we discuss dynamic threshold decryption schemes using bilinear pairing. We discuss and analyze existing schemes, demonstrate an attack and construct a significantly more efficient secure scheme.
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The first dynamic threshold decryption scheme from pairing is presented. It is secure in groups equipped with a bilinear map, and caters to some important requirements in real application; including the needs to renew the master key, or to add/remove or update a decryption sever, without leaking any information on the master key and changing other decryption servers’ secret keys.
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A (t, n) threshold proxy signature scheme allows t or more proxy signers out of a designated group of n proxy signers to sign messages on behalf of an original signer. Recently, Hwang et al. proposed a new (t, n) threshold proxy signature scheme based on the RSA cryptosystem. In this paper, we show that their scheme is insecure against the original signer’s forgery and the general forgery.
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Certificateless public key cryptography is a new paradigm with two interesting features. On one hand, it keeps the certificate free property of identity-based public key cryptography (ID-PKC), while on the other hand, it gets rid of the inherent key escrow problem of ID-PKC. These two distinctive features make certificateless threshold signature schemes more applicable in practice as it removes...
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ژورنال
عنوان ژورنال: Communications of the Korean Mathematical Society
سال: 2009
ISSN: 1225-1763
DOI: 10.4134/ckms.2009.24.1.153