| 摘要 |
The method of verifying the integrity of an encryption key (K) obtained by combining in a protected zone (3) at least two key parts (KM, M) by using a commutative operator, comprises the steps of performing by the commutative operator a first combination between one key part (KM and one verification encryption key (Kv), successively performing by the commutative operator a combination between one key part not yet combined and a result of an immediately preceding combination up to a last combination (Mv) comprising all key parts, performing in the protected zone (3) a combination between the encryption key (K) to be verified and the last combination (Mv) of the verification encryption key (Kv) with the key parts (KM, M) to obtain a final verification key (Kf), performing an encryption of verification data (Dv) by means of a symmetrical encryption algorithm (DES) by using the final verification key (Kf), and comparing with a verification encryption (Cv) obtained by a direct encryption of the verification data (Dv) by means of the verification encryption key (Kv). |
