Arbitrary base value for epid calculation

A method of using arbitrary base values in enhanced privacy ID (EPID) calculations, the method comprising:

• obtaining an arbitrary value at a member device, the member device being a member of a group of member devices, each member device in the group of member devices having a unique private EPID key assigned from a pool of private keys, where any of the pool of private keys is able to sign content that is verifiable by a single group public key, and the arbitrary value being one of a time-based value or a usage-based value;
• constructing an EPID base using the arbitrary value;
• and
• transmitting content signed with the private key using the EPID base to a verifier.

At least one machine-readable medium including instructions for using arbitrary base values in enhanced privacy ID (EPID) calculations, which when executed by a machine, cause the machine to:

• obtain an arbitrary value at a member device, the member device being a member of a group of member devices, each member device in the group of member devices having a unique private EPID key assigned from a pool of private keys, where any of the pool of private keys is able to sign content that is verifiable by a single group public key, and the arbitrary value being one of a time-based value or a usage-based value;
• construct an EPID base using the arbitrary value;
• and
• transmit content signed with the private key using the EPID base to a verifier.