A Randomized Encryption Scheme

Cryptography is a vital part in information handling. It renders the message unintelligible to outsider by various transformations. Data cryptography is the scrambling of the content of data like text, image, audio and video to make it unreadable or unintelligible during transmission. As the data may include some sensitive information which should not be accessed by or can only be partially exposed to the general users. The principal goal guiding the design of any encryption algorithm must be security against unauthorized attacks but performance and the cost of implementation are also important concerns. In this paper, we introduce a new randomized encryption/decryption scheme. It depends on the secret key and a randomly chosen number for every encryption process. The secret key and the random number are used to generate a significant subkey for every block of data. Generation of subkeys is done by simulating a physical operation of turning a movable disk by specific values against a fixed pointer. Forwarding the random number to the receiver is not a trivial job. The algorithm shows high strength for attacks and cryptanalysis.