Verification method, verification apparatus, and storage medium including program stored therein

A verification apparatus that verifies content data to be used in a vehicle, comprising:

• a processor;
• and
• a memory that includes at least one set of instructions that, when executed by the processor, causes the processor to execute operations including:
• acquiring the content data;
• acquiring, from a plurality of pieces of partial data obtained by dividing the content data, a respective plurality of first hash values;
• acquiring a signature generated by using the plurality of first hash values and a key;
• acquiring state information that indicates a state of the vehicle;
• determining an integer N that is greater than or equal to one based on the acquired state information;
• generating, from N pieces of partial data included in the plurality of pieces of partial data, respective second hash values;
• verifying the content data by using each of (a) a subset of the plurality of first hash values which are those respectively generated from partial data other than the N pieces of partial data, (b) the generated second hash values, and (c) the signature;
• and
• outputting information that indicates a result of the verifying.

A non-transitory computer-readable recording medium storing a program for verifying content data to be used in a vehicle, the program causing, when executed by a computer, the computer to implement a method, the method comprising:

• acquiring the content data;
• acquiring, from a plurality of pieces of partial data obtained by dividing the content data, a respective plurality of first hash values;
• acquiring a signature generated by using the plurality of first hash values and a key;
• acquiring state information that indicates a state of the vehicle;
• determining an integer N that is greater than or equal to one based on the acquired state information;
• generating, from N pieces of partial data included in the plurality of pieces of partial data, respective second hash values;
• verifying the content data by using each of (a) a subset of the plurality of first hash values which are those respectively generated from partial data other than the N pieces of partial data, (b) the generated second hash values, and (c) the acquired signature;
• and
• outputting information that indicates a result of the verifying.

A verification method for verifying content data to be used in a mobility, comprising:

• acquiring the content data;
• acquiring, from a plurality of pieces of partial data obtained by dividing the content data, a respective plurality of first hash values;
• acquiring a signature generated by using the plurality of first hash values and a key;
• acquiring state information that indicates a state of the mobility;
• determining an integer N that is greater than or equal to one based on the acquired state information;
• generating, from N pieces of partial data included in the plurality of pieces of partial data, respective second hash values;
• verifying the content data by using each of (a) a subset of the plurality of first hash values which are those respectively generated from partial data other than the N pieces of partial data, (b) the generated second hash values, and (c) the acquired signature;
• and
• outputting information that indicates a result of the verifying.