Cryptanalysis of Key Issuing Protocols in ID-based Cryptosystems

Details Cryptanalysis of Key Issuing Protocols in ID-based Cryptosystems Cryptanalysis of Key Issuing Protocols in ID-based Cryptosystems

2005-06-06

arxiv.org/abs/cs/0506015v1

Computer Science

Cryptography and Security

Submitted to National Workshop on Cryptology 2005, India

Scientific paper

To remove key escrow problem and avoid the need of secure channel in ID based
cryptosystem Lee et al. proposed a secure key issuing protocol. However we show
that it suffers from impersonation, insider attacks and incompetency of the key
privacy authorities. We also cryptanalyze Sui et al.'s separable and anonymous
key issuing protocol.

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