Implementation of new encryption algorithm with random key selection and minimum space complexity

In this paper, we proposed our new symmetric key encryption algorithm with reduced space complexity (AM Encryption Algorithm-AMEA). According to disk encryption theory an encryption technique should use less than or equal to the size of the original file size. There are two most important parameters or characteristics of algorithm time and space. An algorithm should require minimum time to perform their function and should have minimum space complexity (space complexity in terms of storage space after the encryption or the storage space required to store ciphertext). Different types of algorithm has been designed some of them provides better security but the space complexity of all existing algorithm is high. So, we proposed a new cryptographic algorithm based on symmetric key stream cipher that provides better security with minimum space complexity. This algorithm is not same as previous stream cipher algorithm (the most commonly used RC4) it has some new features such as Random Key Selection with transposition that provides better security.