Modified Vigenere Encryption Algorithm and Its Hybrid Implementation with Base64 and AES

Security is a mechanism by which information is protected from unintended or unauthorized access, change or destruction. To secure such information process of encryption is used. Encryption is the act of transforming sensitive data through an algorithm to make the data unreadable in such a way that only the person (or computer) with the key can have access to it. In this paper hybrid approach is used for applying encryption algorithms. Different kinds of algorithms such as substitution cipher, symmetric algorithm etc are used. The system's security is greatly improved, through researching several famous data encryption algorithms, improving some data encryption algorithms and arranging them in a suitable order. Avalanche Effect is chosen as a metric for measuring performance of proposed algorithm and its implementation. Proposed algorithm shows significant high Avalanche Effect, as compared with Vigenere Encryption Algorithm.