Pre-encrypted user data for secure passive UHF RFID communication

A pre-encryption algorithm for passive ultra-high frequency (UHF) radio frequency identification (RFID) systems is described. The algorithm is based on advanced encryption standard (AES) as the core encryption technique with two extra steps; first step is random key generation and the second step is data randomization, which increase the immunity of the encryption process against attacks. The algorithm is implemented using C programming language and is used to encrypt and decrypt the user data of an UHF RFID passive tag. The algorithm is simple, easy to implement and does not require any hardware changes at the reader and tag sides. Moreover, it is difficult to break due to its multiple steps and randomness. The algorithm ensures secured communication for the passive UHF RFID system.