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Radio frequency identification (RFID) is a wireless technology for automatic identification and data capture. Security and privacy issues in the RFID systems have attracted much attention. Many approaches have been proposed to achieve the security and privacy goals. One of these approaches is RFID authentication protocols by which a server and tags can(More)
In 2012, Piao et al. proposed a polynomial-based key management for secure intra-group and inter-group communication. In this notes, we point out that there are some security weaknesses of Piao et al.'s intra-group key distribution scheme. One main problem is that their scheme cannot prevent a group member to obtain other members' secret keys shared with(More)
Key agreement protocols are essential for secure communications in open and distributed environments. Recently identity-based key agreement protocols have been increasingly researched because of the simplicity of a public key management. The basic idea behind an identity-based cryptosystem is that a public key is the identity (an arbitrary string) of a(More)
—Certificateless cryptosystems were proposed by Al-Riyami and Paterson in 2003 [1] to solve problems of public key cryptosystems based on PKI and based on identity. Up to now, various types of certificateless cryptographic primitives as encryption functions, signature schemes, key agreement protocols and etc, have been designed. But to the best of our(More)
In 2012, Xie proposed an authentication scheme based on Elliptic Curve Cryptography (ECC) for Session Initiation Protocol (SIP). However, this paper demonstrates that the Xie's scheme is vulnerable to impersonation attack by which an active adversary can easily forge the server's identity. Based on this attack, we also show that the Xie's scheme is also(More)