1, encryption mechanism is a special method, which can change the original information data, so even if unauthorized users get the encrypted information, they can't know the content of the information because they don't know the decryption method. In aviation, encryption mechanism can be used to ensure the security of information during transmission.

2. Digital signature mechanism is a kind of digital signature that must be transmitted when data interface requests, which is used to verify the source and integrity of information. When all data interfaces request, a digital signature must be passed in, and the digital signature uses MD532 bit specification.