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Weaknesses and improvements of an efficient certificateless signature scheme without using bilinear pairings
Author(s) -
Tsai JiaLun,
Lo NaiWei,
Wu TzongChen
Publication year - 2014
Publication title -
international journal of communication systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.344
H-Index - 49
eISSN - 1099-1131
pISSN - 1074-5351
DOI - 10.1002/dac.2388
Subject(s) - computer science , key escrow , signature (topology) , public key cryptography , computer security , cls upper limits , scheme (mathematics) , bilinear interpolation , key (lock) , adversary , theoretical computer science , mathematics , encryption , mathematical analysis , geometry , computer vision , medicine , optometry
SUMMARY The certificateless signature (CLS) scheme is a special signature scheme that solves the key escrow problem in identity‐based signature schemes. In CLS schemes, the private key is generated cooperatively by the key generator center (KGC) and signer, such that a malicious KGC cannot masquerade as the signer and sign a message. He et al . in 2011 proposed an efficient CLS scheme without using bilinear pairings. However, we discovered that the CLS scheme by He et al . cannot resist a strong type 2 adversary if this adversary replaces the master public key of the KGC. This work proposes an improved scheme that overcomes this weakness. Copyright © 2012 John Wiley & Sons, Ltd.