US Patent 11934554 Information security by preventing unauthorized data access

A decoder is provided for decoding user information. The decoder obtains a random code pattern from at least one of a card or a device owned by a user. The decoder further obtains a personal identifier from the user. The decoder then queries a mapping table based on a combination of the random code pattern and the personal identifier of the user, wherein the mapping table comprises user information associated with each of a plurality of users mapped to a respective unique combination of a random code pattern and a personal identifier of the user. The decoder obtains user information of the user in response to the query, wherein one or more actions are performed based on the user information.