Cryptographic Algorithm Approach for Low Cost RFID Systems

Today the security of RFID systems is a very important issue especially for low cost RFID tags. Then, it is difficult for several researchers to adopt a strong encryption algorithm due to the extremely limited computational, storage and communication abilities of the tag. So, the priority in RFID systems is to ensure the integrity, confidentiality and authentication of messages using different algorithms (such as encryption and hashing algorithm). In this paper, we propose a lightweight symmetric key encryption approach that includes integrity as part of the encryption process in order to meet the resource limitations of low cost RFID tags. Furthermore we do not need to use separate hash functions to verify message integrity, thus leading to increase the computational efficiency of the system.