Patent ID: 7043642

Claim:
Process to manage data stored in a first memory of a first chip of a first chip card in which: a first management code is produced with a first cryptographic algorithm based on a mother key and a first set of identification data of the first chip card, said first management code is recorded in the first memory, the first card is linked to a chip card reader, and editing of data stored in the first memory is authorized if a secret code presented to the reader is compatible with the recorded first management code, wherein the following steps are performed: a second management code is produced with a second cryptographic algorithm based on data relating to the first card and a second set of identification data of a second chip card, said data relating to the first card and the second management code are recorded in a second memory of a second chip of the second chip card, and editing of the data stored in the second memory is authorized if a secret code presented to the reader is compatible with the recorded second management code.