| Summary: | 碩士 === 明志科技大學 === 電機工程研究所 === 100 === With the advancement of technology, the trends of reading a power meter have been moved from labor to automated meter reading. The advantages of automated meter reading are lower cost and less error.
This thesis proposed a system to ensure the ciphertext transmutation that can prevent the data from stolen by prying eyes. For reacting the principle of time-of-use rate charge according to period, we need a set of accurate time synchronization to assure the basis of the charge. Furthermore, adopting the concept of time and the use of the change of time embedded within this system increases the diversity of ciphertext and make the code-breaking impossible.
To combine the way of encryption with time, the concept of time synchronization is materialized with IEEE 1588 (Precision Time Protocol, PTP) which uses the clock rate of master and slave. Time would be synchronized by using an equation to continue master’s oscillation frequency and fine tuning. With PTP, the timestamp of two connected computer systems can be synchronized such that the encryption and decipher can be assured and avoided losing the efficacy of online transmitting information.
This system adopts LabVIEW combined with Caesar Cipher by Rail Fence Cipher to make encryption and realized the concept of the change of time.
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