A TIME-VARIANT APPROACH FOR ENCRYPTED DIGITAL COMMUNICATIONS

Abstract

Two new approaches, a time-variant key and a random transmission rate, are introduced to strengthen the security of encrypted digital communications in which a “black-box” type of crypto-device is employed. These approaches not only further upgrade present crypto-methodology, but may also secure the system against the possibility of the cryptographic key’s falling into the hands of an unauthorized listener after initial communication has begun. Therefore, communication privacy could be maintained even under the most scrutinizing post-recorded ciphertext attack.