Patent ID: 11924178
Assignee: MAXIO TECHNOLOGY (HANGZHOU) CO., LTD.
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 12:
13. A method for information distribution, comprising:
executing following steps on a server:
generating a key pair which is required by a public key cryptographic algorithm and includes a public key and a private key;
collecting private identifiers encrypted by said public key of a plurality of terminals;
constructing a group according to the private identifiers submitted by the plurality of terminals;
generating a group shared key;
calculating a key deriving parameter according to the group shared key, an additional parameter and the private identifiers of the plurality of terminals;
encrypting a package of sensitive content by use of the group shared key to obtain a package of encrypted information; and
packaging the encrypted information, the key deriving parameter and the additional parameter together into a package and distributing the package,

executing following steps on each one of the plurality of terminals:
encrypting the private identifier which is global unique and associated with a corresponding one of the plurality of terminals by use of the public key to generate a ciphertext of the private identifier;
receiving the encrypted information and the key deriving parameter distributed by the server via an open channel;
performing an inverse operation according to the key deriving parameter, the additional parameter and the private identifier associated with the corresponding one of the plurality of terminals to obtain the group shared key; and
decrypting the encrypted information by use of the group shared key to obtain the sensitive content.