  Radio Frequency Identification (RFID) is a modern communication technology,
which provides authentication and identification through a nonphysical contact.
Recently, the use of this technology is almost developed in healthcare
environments. Although RFID technology can prepare sagacity in systems, privacy
and security issues ought to be considered before. Recently, in 2015, Li et al.
proposed SRTA, a hash-based RFID authentication protocol in medication
verification for healthcare. In this paper, we study this protocol and show
that SRTA protocol is vulnerable to traceability, impersonation and Dos
attacks. So it does not provide the privacy and security of RFID end users.
Therefore, we propose an improved secure and efficient RFID authentication
protocol to enhance the performance of Li et al. method. Our analyze show that
the existing weaknesses of SRTA protocol are eliminated in our proposed
protocol.

Cryptography and Security