Dynamic Text Encryption

Abstract

Although many encryption algorithms achieve high levels of security, they adopt a static computational behavior that is ensured only by the secret key. If the key is predicted, the ciphered text can be easily decrypted, and thus it is unclear how the security of these algorithms will play out given the tremendous increase in processor power and the availability of sophisticated tools that can analyze ciphered text and predict a key. This paper proposes a dynamic approach to encryption in which a static knowledge of symbols and mapping tools is defined, but also in which the computations of the algorithm, and consequently the encryption, is dynamically controlled by adjusting the behavior of the operations. In addition to a key, the dynamic behavior of the algorithm provides additional tools such as masking and mapping rules to protect ciphered. Experiments conducted with our prototype implementation showed that our system is effective with linear execution time and fixed space requirements.