Key to enter the market does not use the same key to encrypt and decrypt data like some encryption technologies, while public key encryption technology uses a pair of matching keys to encrypt and decrypt data. Each key performs one-way data processing, and the function of each key is just the opposite of the other. When one key is used for encryption, the other key is used for decryption. The public key is made public by its owner, while the private key must be kept secret. In order to send a confidential message, the sender must use the public key of the receiver to encrypt the data. Once encrypted, only the receiver can decrypt it with his own private key. Conversely, users can also process data with their own private keys. In other words, the key pair can work in any direction. This provides the basis of "digital signature". If a user uses his own private key to process data, others can use the public key he provides to process data. Because only the owner knows the private key, the processed message forms an electronic signature-a file that no one else can generate. A digital certificate contains public key information to confirm the identity of the user who owns the key pair. Define keys for authentication and enabling functions. Among the regular activation codes, it is used for online game novice card encryption, online game internal test activation code and open network product invitation code. The universal digital key (universal activation code) mainly promotes the concept of "universal". It aims to endow the digital key "activation code" with the characteristics of "liquidity, expansibility and initiative". It can be extended to the invitation code of various products \ enterprise network publicity activities. In the field of encryption technology, the digital key of 12- 16 digits is relatively mature. Through a set of formulas, 12- 16 letters+numbers are generated. This column of figures is the original form of the product. Establish the official website of "Master Digital Key", and users can get a set of master digital keys (master activation code) belonging to TA by registering as members. Ordinary user function 1, you can log in to official website at any time to query the exclusive key. 2. Users can copy and save it. 3. Users can choose decorations or souvenirs printed with exclusive keys and get them by mail. (Users bear the production and mailing costs) 4. Used for application support products/enterprises/activities. The application supports the user function 1, and integrates the "universal digital key" product into its own system or exists in parallel with its own digital key (encryption/decryption product). 2. Get the benefits of the extended attributes of the "master digital key" (advertising invitation, value-added rights and interests, value-added services). 3, convenient for ordinary users.