Securing key exchange and key agreement security schemes for RFID passive tags

In the last decade, various types of RFID security schemes have been proposed which have tried to provide all security and privacy requirements of end-users. In this paper, we cryptanalyze two new-found key exchange and key agreement security schemes which are proposed by Zhang et al. and Kim in 2012 and 2013 respectively. We present the reveal secret parameter, tag impersonation and traceability attacks on Zhang et al's protocol with success probability “1”, and also we show that an attacker can impersonate the tag and the reader of Kim's protocol both with success probabilities “1/4”. We also present some modifications on the structure of studied schemes and propose two modified schemes which overcome all the discovered flaws. Finally, the improved protocols are compared with some similar protocols in terms of security and privacy.