Vol. 7, Special Issue 2 (2025)

Encryption and decryption are significant applications of cryptography, which allows data security by disrupting third-party access, and the key feature behind this is congruence, a modular arithmetic technique that codes text using a congruence function where alphabets in text get converted into numeral values according to their order in the alphabet and decodes back to the original text for the recipient. Computer science and number theory are two distinct disciplines that are combined in this study. The applicability of this approach to solve the linear congruences is demonstrated by a few sample instances.
This mathematical procedure has led to great usage in digital security, like website security, emails, confidential/sensitive data, online transactions, VPNs, and social platforms.