Protection of data that is to be transmitted over a network, e.g. the Internet, has a stage where data is encoded using a physical key associated with the computer and a stage where an electronic signature is attached to it

摘要

Procedure in which data to be encoded is encoded (1000) so that a set of encoded data (CE) is generated. An electronically signed envelope (ES) comprises an electronic signature associated (1001) with encoded data for transmission or stocking together. An Independent claim is made for a data protection system. Procedure is for a computer with a physical key that contains specific cryptographic parameters. All data processed by the computer is encoded using the cipher key and an electronically signed enveloped is associated with the data comprising non-encoded data such as a random number of p bits, an identification sign for verifying the existence of encoded data, a number representative of the physical key and a linked electronic signature (SEC).