A Proposed System Concept on Enhancing the Encryption and Decryption Method Using USB Mass Storage Device

Abstract

We have proposed system that involves the security of data by using the external Universal Storage device (USB) and Personal Identification Number (PIN) using as a key .The model should reduce time complexity by altering the traditional method of AES algorithm. We modified the AES algorithm key generation part with SHA to increase the security part. It reduces the time complexity of traditional AES algorithm. It gives the user more control on selection on his/her password, which were random generated earlier We have found that after modifying the AES algorithm, time complexity of overall encryption/decryption is reduced than traditional method, Key generation of AES algorithm takes more time than the message digest of SHA256, so replacing that part increases the time of encryption/decryption of same file. We have also found that using SHA, intruder can’t generate the input (USB’ serial number and user’s PIN) from output. Authors have found that this model can be used for the securing the file from unauthorized access , can be used for personal data encryption/decryption. Authors have improved the AES algorithm after replacing the key generation part with SHA.