Patent ID: 8555337

Claim:
A method of authenticating at least a first device to a user, the method comprising a conversion of a checksum generated within the first device to a user friendly output format, the method comprising: a set up sequence, comprising: receiving and storing at least a first preferred output format selected from at least two user friendly output formats; and receiving and storing a specification of keying material to be included in the checksum calculation, and a device configuration verification sequence comprising: extracting the selected keying material from at least one identification module comprised in the personal device; calculating a checksum based on the keying material; determining which user friendly output format to use, said determination at least partly based on the at least a first preferred output format; and converting the checksum to the selected user friendly output format; wherein the user friendly output format comprises one or a combination of an image, a sound, and a text; and wherein the keying material comprises a device identifier.