Patent ID: 6738912
Filing Date: 2004-05-18
Classification: G06Q,H04L

Abstract:
Method for securing data relating to users of a public key infrastructure who may present certificates (11) at an institution (30) in order to initiate transactions, comprising the steps ofa) providing cryptographic means to the institution (30) which are designed for encrypting and decrypting data, b) generating relational data based on an agreement between a certificate holder and the institution (30), c) generating a secret key or a key pair (35, 36) which is designed for encrypting and decrypting data and which is used and securely stored by the institution (30), d) encrypting the relational data by the institution (30) with said cryptographic means, e) encrypting the relational data with the secret key or the first key of said key pair (35, 36) of the institution (30), f) integrating the encrypted relational data into the certificate (11) of said certificate holder, g) decrypting said encrypted relational data contained in the certificate (11) of said certificate holder with said cryptographic means whenever a transaction is to be performed based on said agreement between the certificate holder and the institution (30) and h) decrypting said encrypted relational data contained in the certificate (11) of said certificate holder by means of the secret key or the second key of said key pair (35, 36) of the institution (30) whenever a transaction is to be performed based on said agreement between the certificate holder and the institution (30).