Implementation of Elliptic Curve Digital Signature Algorithm Using Variable Text Based Message Encryption with Message Digest

Digital Signatures are considered as digital counterparts to handwritten signatures, and they are the basis for validating the authenticity of a connection. It is well known that with the help of digital signature, forgery of digital information can be identified and it is widely used in e-commerce and banking applications. Elliptic curve digital signatures (ECDSA) are stronger and ideal for constrained environments like smart cards due to smaller bit size, thereby reducing processing overhead. We have implemented ECDSA over Elliptic Curve (EC) P-192 and P-256 using various Text Message encryptions which are Variable Size Text Message(VTM), Fixed Size Text Message(FTM) and Text Based Message(TBM) encryption methods and compared their performance. In the existing Variable Text Based Message used the plain message for generating digital signature but in the new approach, we have converted plain message to digested message using SHA algorithm and then created digital signature which is more faster than existing approach.