Patent ID: 7822975

Claim:
A method of authenticating data to be transmitted in a digital transmission system, the data comprising at least one identifier of a certificate to revoke, the method comprising: when the at least one identifier is not for a root certificate: determining one encrypted value for the data, wherein the one encrypted value is determined using a private key associated with an encryption algorithm; and outputting the data and the one encrypted value, when the at least one identifier is for the root certificate: determining at least two encrypted values for the data, wherein each encrypted value is determined using the private key corresponding to a respective encryption algorithm; and outputting the data and the at least two encrypted values to a receiver, wherein the root certificate has a signature value that is calculated using the private key to an equivalent public key, wherein each encrypted value is processed by the receiver using the private key to create a resulting value of a plurality of resulting values, and wherein the plurality of resulting values enable authentication of the data by comparison between each resulting value and the data.