| Summary: | 碩士 === 東海大學 === 資訊工程學系 === 103 === The transmission of information is getting more frequently because of the rapid development of the Internet and cloud. Thus information security protection mechanisms are important. DES and AES are currently the most widely used encryption mechanism. The two encryption methods for logical formula have been suffering from a variety of attacks. A few years ago DES was cracked open. Computer processing speed and computing capability are improving, and AES may not be safe in the future.
A wrapping feedback encryption method based on password is proposed. We use a password or input key channel as an encrypted key, and dynamic rotary displacement box (Dynamic Rotating S-Box, DRS-Box) encryption technology to produce the required subsystem encryption key group. Current time parameters and random number keys are wrapped feedback encryption as dynamic parameters. This password and ciphertext length of the current content and file of time keep changing, so intruder cannot effectively collect the secret plaintext and ciphertext files. Each plaintext block are subject to internal feedback streaming and two-dimensional code encryption operations, which ensures the security of the ciphertext block and enhances the performance. Through theory and analysis, the WFBPW and AES are up to the actual security to cloud communications. The WFBPW has better performance than AES; thus WFBPW is more suitable for the protection of cloud file transmission.
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