Encryption apparatus, program for use therewith, and method for use therewith

A program stored in a non-transitory computer-readable storage medium that is configured to be read and executed by a data processing apparatus configured to generate encryption data to perform a method comprising:

• inputting first identification data and second identification data different from said first identification data from an external apparatus;
• selecting an encryption method from among a plurality of different encryption methods on the basis of said first identification data;
• selecting plaintext data to be encrypted from among a plurality of different pieces of plaintext data on the basis of said second identification data;
• obtaining encryption data such that said plaintext data selected in said plaintext data selecting step is encrypted by said encryption method selected in said encryption method selecting step,
• wherein said data processing apparatus includes correspondence table data indicating different combinations of at least one of said plurality of different encryption methods and said plurality of different pieces of plaintext data and said encryption data corresponding to each combination, obtains said encryption data from a particular combination included in the correspondence table data corresponding to selection results by said selecting an encryption method and said selecting plaintext data, and when it is determined that encryption data of said combination corresponding to the selection results does not exist within said correspondence table data, generating said encryption data by performing said encryption based on the selection results of selecting said encryption method and said plaintext data without utilizing the correspondence table data;
• and
• authenticating access from the external apparatus based on said encryption data.

A data processing method executed by a data processing apparatus configured to generate encryption data, said data processing method comprising:

• inputting first identification data and second identification data different from said first identification data from an external apparatus;
• selecting an encryption method from among a plurality of different encryption methods on the basis of said first identification data;
• selecting plaintext data to be encrypted from among a plurality of different pieces of plaintext data on the basis of said second identification data;
• obtaining encryption data such that said plaintext data selected in said selecting plaintext data step is encrypted by said encryption method selected in said selecting an encryption method step,
• wherein said data processing apparatus includes correspondence table data indicating different combinations of at least one of said plurality of different encryption methods and said plurality of different pieces of plaintext data and said encryption data corresponding to each combination, obtains said encryption data from a particular combination included in the correspondence table data corresponding to selection results by said selecting an encryption method and said selecting plaintext data, and when it is determined that encryption data of said combination corresponding to the selection results does not exist within said correspondence table data, generating said encryption data by performing said encryption based on the selection results of selecting said encryption method and said plaintext data without utilizing the correspondence table data;
• and
• authenticating access from the external apparatus based on said encryption data.

An authentication system comprising:

• means for outputting first identification data and second identification data different from said first identification data from an external apparatus;
• means for receiving and processing the first identification data and the second identification data to obtain encryption data, said means for receiving and processing including,
• first selection means for selecting an encryption method from among a plurality of different encryption methods on the basis of said first identification data,
• second selection means for selecting plaintext data to be encrypted from among a plurality of different pieces of the plaintext on the basis of said second identification data,
• encryption means for obtaining encryption data such that said plaintext data selected by said second selection means is encrypted by said encryption method selected by said first selection means, and said encryption means includes correspondence table data indicating different combinations of at least one of said plurality of different encryption methods and said plurality of different pieces of plaintext data and said encryption data corresponding to each combination, obtains said encryption data from a particular combination included in the correspondence table data corresponding to selection results by said first selection means and said second selection means, and when it is determined that encryption data of said combination corresponding to the selection results by said first selection means and said second selection means does not exist within said correspondence table data, said encryption means generates said encryption data by performing said encryption based on the selection results of said first selection means and said second selection means without utilizing the correspondence table data;
• and
• authentication means for authenticating access from the external apparatus based on said encryption data.

An authentication apparatus configured to authenticate access from an external apparatus by generating encryption data on the basis of specified identification data, said authentication apparatus comprising:

• a processor;
• an interface configured to receive first identification data and second identification data different from said first identification data from the external apparatus;
• an encryption method selection module configured to select an encryption method from among a plurality of different encryption methods on the basis of said first identification data;
• a plaintext to be encrypted selection module configured to select plaintext data to be encrypted from among a plurality of different pieces of the plaintext data on the basis of said second identification data;
• an encryption module configured to obtain encryption data having said plaintext selected by said plaintext to be encrypted selection section encrypted by said encryption method selected by said encryption method selection module, and said encryption module includes correspondence table data indicating different combinations of at least one of said plurality of different encryption methods and said plurality of different pieces of plaintext data and said encryption data corresponding to each combination, obtains said encryption data from a particular combination included in the correspondence table data corresponding to selection results by said encryption method selection module and said plaintext to be encrypted selection module, and when it is determined that encryption data of said combination corresponding to the selection results by said encryption method selection module and said plaintext to be encrypted selection module does not exist within said correspondence table data, said encryption module generates said encryption data by performing said encryption based on the selection results of said encryption method selection module and said plaintext to be encrypted selection module without utilizing the correspondence table data;
• and
• an authentication module configured to authenticate the access from the external apparatus based on said encryption data.

An authentication system, comprising:

• a processor;
• an output source configured to output first identification data and second identification data different from said first identification data;
• an application module configured to receive and process the first identification data and the second identification data to obtain encryption data, said application module including,
• an interface configured to receive first identification data and second identification data different from said first identification data from an external apparatus,
• an encryption method selection module configured to select an encryption method from among a plurality of different encryption methods on the basis of said first identification data,
• a plaintext to be encrypted selection module configured to select plaintext data to be encrypted from among a plurality of different pieces of plaintext data on the basis of said second identification data;
• an encryption module configured to obtain encryption data having said plaintext selected by said plaintext to be encrypted selection section encrypted by said encryption method selected by said encryption method selection module, and said encryption module includes correspondence table data indicating different combinations of at least one of said plurality of different encryption methods and said plurality of different pieces of plaintext data and said encryption data corresponding to each combination, obtains said encryption data from a particular combination included in the correspondence table data corresponding to selection results by said encryption method selection module and said plaintext to be encrypted selection module, and when it is determined that encryption data of said combination corresponding to the selection results by said encryption method selection module and said plaintext to be encrypted selection module does not exist within said correspondence table data, said encryption module generates said encryption data by performing said encryption based on the selection results of said encryption method selection module and said plaintext to be encrypted selection module without utilizing the correspondence table data;
• and
• an authentication module configure to authenticate the access from the external apparatus based on said encryption data.