working principle of p>IC card access control system:
inductive technology, or radio frequency identification (RFID) technology, is a method to read the information on the card without direct contact between the card and the card reader.
encryption of IC card access control:
there is no mechanical contact between RF IC card and card reader, so RF IC card is especially suitable for access control system with large traffic. Radio communication technology is used to communicate between the RF IC card and the card reader, and the radio waves are open in space and easily intercepted by the outside. Therefore, the ordinary logic encrypted RF IC card without CPU can't resist the simplest password attack, and the communication content is easily stolen, tampered and counterfeited, and its security is even worse than that of the ordinary logic encrypted contact IC card.
encryption technology of DES algorithm for p>IC card access control:
DES algorithm is used without any patent and license restrictions. DES algorithm encryption and decryption can use the same program, as long as a small change is added at the end of iteration, so programming is convenient and simple. Strengthen that correct execution. If one of the authenticators and the authenticated party fails to implement the agreement correctly, the agreement will be terminated. Every time the data is sent, it is coded with random numbers. When the same data is sent, the transmitted ciphertext will not be repeated every time. Resisting replay attacks has a good effect. Choosing a good pseudo-random number generation algorithm can further improve the security.