Patent ID: 11888984
Assignee: GIESECKE+DEVRIENT MOBILE SECURITY GMBH
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 8:
9. The microprocessor device according to claim 2, wherein the cryptographic operation is either one of:, a key generation operation according to an operational cryptographic system, with the output being a cryptographic key, and with at least the output cryptographic key being encrypted according to said additive homomorphic cryptographic system; or, a cryptographic signature generation operation according to an operational cryptographic system constructed to generate a cryptographic signature {r, s} based on a secret key (d), with the output being the cryptographic signature {r,s}, and with at least the secret key (d) or/and a value (v1) derived from the secret key (d) being encrypted according to said additive homomorphic cryptographic system; or, a key exchange operation between different parties according to an operational cryptographic system, with the output being a common secret key (R) shared between the different parties and calculated based on an own secret key (d) and a public key (P) of the other party, and with at least the secret key (d) of each party being encrypted according to said additive homomorphic cryptographic system.