Patent ID: 11956359
Assignee: VISA INTERNATIONAL SERVICE ASSOCIATION
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 7:
8. The method of claim 1, wherein after the user device receives the encrypted first symmetric key, the first nonce, the first doubly encrypted data, and the public encryption key associated with the relying party from the processing network computer, the user device:
decrypts the encrypted first symmetric key using a secret encrypted key associated with the user device;
decrypts the first doubly encrypted data using the first symmetric key and the first nonce to obtain the second encrypted data associated with the user;
generates the third symmetric key;
encrypts the third symmetric key using the public encryption key associated with the relying party to form the encrypted third symmetric key; and
encrypts the second encrypted data associated with the user with the third keystream that is generated using the keystream generation function with the third symmetric key and the third nonce to obtain the second doubly encrypted data.