LTCHA: LIGHT-WEIGHT TWO-WAY CRYPTOGRAPHIC HASH ALGORITHM FOR CLOUD

The cryptographic hash algorithms play a significant role in preserving the data security in the wireless networks. The most frequently used hash algorithms such as Message Digest (MD5) and Secure Hash Algorithm (SHA1) need high computational overhead. The energy-starved network does not afford such high computational overhead. The major constraints in the network are communication, computation and storage overheads. To overcome these issues, this paper develops a Light-Weight Two-Way Cryptographic Hash Algorithm (LTCHA) for generating a hash-digest of minimum length for the energy-starved network. This paper proposes an LTCHA for two-way authentication between the user and Cloud Service Provider (CSP). The Third Party Auditor (TPA) approves the CSP if the identity (ID) and hashcode of the user matches with the generated ID and hashcode. After receiving the approval, the user can upload the file to the service provider. File splitting is performed. After splitting the file, it is allocated to the suitable Virtual Machine (VM) in the cloud by using the ACO-based task allocation algorithm. The proposed LTCHA algorithm requires lower energy consumption, overall execution time, key size, time for encryption and file uploading than the existing schemes.