A PLC system that adopts the encrypting or decrypting method, that comprises CPU, memory, bus, multiple I/O modules; wherein the said CPU, memory and I/O modules are all connected to bus; it also includes a mapping module which is connected to the said bus, which is used to map the unique identifier in the said memory to the key K and encrypt or decrypt the information stored in the memory with the said key K used in the symmetrical encryption algorithm.
A decrypting method that corresponds to the encrypting method in the present invention, the system which incorporate the memory reads the unique identifier in the memory, and maps said the unique identifier to a key K using an algorithm F() which is stored in the said system, and decrypt the information stored in the memory with the said key K used in the symmetrical encryption algorithm.
The encryption method as claimed in the present invention comprises the steps as follow: store an algorithm F() in the system, map the unique identifier stored in the memory to a key K by using this algorithm, and encrypt the information stored in the memory with the said key K used in the symmetrical encryption algorithm.
The information stored in the memory is encrypted or decrypted with the symmetrical encryption algorithm that uses KeyIDas the key, wherein the present invention will only use PLC system as an example to describe the encryption and decryption of the control program in the PLC system, of cause the encryption and decryption of the present invention can also be used in the existing computer systems.
The volume encryption algorithm cannot be used on this sector size.
此扇区大小上无法使用卷加密算法。
This article will focus on symmetric and asymmetric encryption algorithms.
本文将重点介绍对称和非对称加密算法。
The encryption algorithm does not support the sector size of that volume.
加密算法不支持该卷的扇区大小。
Apple uses standard encryption algorithms to protects its files.
苹果使用标准的加密算法来保护文件。
That system probably contains the new data encryption algorithm.
那个系统或许包含 一种新的数据加密算法。
Gets or sets the symmetric key encryption algorithm.
获取或设置该对称密钥加密算法。
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