Patent ID: 7769164
Filing Date: 2010-08-03
Classification: G06F

Abstract:
1. A printing apparatus comprising: a transmitting and receiving section which transmits information to an external apparatus and receives information from an external apparatus; a first storing section which stores a first list of entries in a flash memory in which the first list of entries is retained upon a power source being turned on/off, each entry including processing information including an identification number corresponding to one of a plurality of first encryption processing means that can be used by the printing apparatus, the entries of the first list capable of being arranged in a predetermined order by a user; a second storing section which stores a second list of entries in a random access memory in which the second list of entries is erased upon the power source being turned on/off, each entry including processing information corresponding to one of a plurality of second encryption processing means that can be used by the external apparatus, the second list being previously received by the printing apparatus from the external apparatus; and a deciding section which sequentially compares, in the predetermined order of the first list, the entries of the first list with the entries of the second list; wherein if one of the entries of the first list matches one of the entries of the second list, the deciding section selects the processing means corresponding to a first matching entry for use by both the printing apparatus and the external apparatus and notifies the external apparatus of the selected encryption processing means and if a matched entry does not exist, the deciding section notifies the external apparatus of an error.