Digital Signature Security Enhancement: Using X-OR Operation on RSA and AES with 4096 Bits Key Length

In the face of escalating digital threats, the robustness of cryptographic techniques, especially digital signatures, is paramount for ensuring data integrity and authenticity. The impact of Digital Signatures has increased to a great extent while communicating through the digital messaging. It is very important to protect the important message that is being sent from the sender to receiver from some third party trying to access the message. Integrity and non-repudiation are the two key aspects of cryptography that Digital Signatures try to maintain. The objective of this paper is to provide high level security to the sender as well as the receiver with the kind of system that the authors has designed. The system designed is very robust and practical to implement which reduces the brute force due to its high complexity. In the implementation section RSA and AES algorithms are combined for designing this system. The private keys for both the AES and RSA has been converted to 4096 bit from 256 bits in order to reduce the chances of error. Then the XOR operation is performed on both these private keys to get a combined private key which is highly secure. Similarly, 4096-bit public key is also being generated for the decryption process. Once the message is reached to the sender with digital signature, it is then being decrypted to check the integrity of the message. As result, the proposed method (digital signature generation) is able to implement and work in different kind of applications.