Patent ID: 8015401

Claim:
A method of authenticating data to be transmitted by a transmitter in a digital transmission system, comprising: when the data comprises at least one identifier of a certificate to be revoked: calculating at least one digital signature from the data, wherein the at least one digital signature is calculated using a key associated with at least a first encryption algorithm; and outputting, by the transmitter, the data and the at least one digital signature, when the data comprises at least one replacement root certificate: calculating at least two digital signatures from the data, wherein the at least two digital signatures are calculated from the same data, and wherein each digital signature is calculated using a key corresponding to at least a second and a third encryption algorithm, respectively; and outputting, by the transmitter, the data and the at least two digital signatures, wherein the data and the at least two digital signatures are organized in a data file, wherein the data file is output in a data module, and wherein a module encrypted value for the data in the data module is calculated using a key corresponding to a transmitter encryption algorithm and output in the data module.