US 2017/0255503 A1 · METHOD FOR CONTROLLING ERROR RATE OF DEVICE-SPECIFIC INFORMATION AND PROGRAM FOR CONTROLLING ERROR RATE OF DEVICE-SPECIFIC INFORMATION

Abstract

A method and a program capable of controlling an error rate of device-specific information are provided. Provided is the method for controlling an error rate of device-specific information, including a step S1 of: inputting each of i (i is an arbitrary natural number) challenges, j times (j is an arbitrary natural number), into a PUF mounted chip; leaving j responses intact (j′=j) or processing j responses into j′ pieces (0<j′<j); and registering them in the database beforehand in association with each piece of the input data, a step S2 of inputting i challenges into the database, a step S3 of: reading j′ responses corresponding to the respective i challenges from the database; concatenating the j′ responses for each piece of the input data; further concatenating the concatenated data by k′ repetitions (0<k′≦k, and k is an arbitrary natural number, but is a natural number of 2 or more if the i and the j are both 1); obtaining the concatenated (j′×k′) responses for each piece of the input data; and further concatenating them also for different input data to obtain concatenated (i×j′×k′) responses and thereby generate reference data, a step S4 of: inputting i challenges, k times, for each challenge into the PUF mounted chip; leaving obtained k responses intact as k′=k or processing the obtained k responses into k′ pieces (0<k′<k); concatenating obtained k′ responses by j′ repetitions for each response; further concatenating them for all of the k′ responses; further concatenating concatenated (j′×k′) responses also for different input data; and obtaining concatenated (i×j′×k′) responses to generate synthesized output data, and a step S5 of deciding whether or not the synthesized output data matches the reference data (specifically, whether a Hamming distance between both data is a threshold value or less), and the method determines whether or not the error rate of the synthesized output data is within a preset range based on the decision result in step S5, and changes at least one of i, j, j′, k, and k′ to repeat steps S1 to S5 until the error rate falls within the preset range if the error rate is determined not to be within the preset range.

Claims12

Dependent claims

A method for controlling an error rate of device-specific information, the method comprising:

a first step of:
inputting each of i (i is an arbitrary natural number) pieces of input data, j times (j is an arbitrary natural number), into a physically unclonable circuit;
processing j responses into j′ pieces (j′ is an arbitrary natural number, and 0<j′≦j);
and storing them in a storage means beforehand in association with each piece of the input data;
a second step of:
inputting the i pieces of the input data into the storage means;
reading the j′ responses corresponding to the respective i pieces of the input data from the storage means to concatenate the obtained j′ responses for each piece of the input data;
further concatenating the concatenated data by k′ repetitions (k′ is an arbitrary natural number and 0<k′≦k, where k is an arbitrary natural number, and k is 2 or more when the i and the j are both 1);
and further concatenating the obtained data for i pieces for different input data to generate reference data;
a third step of:
inputting the i pieces of the input data, k times, for each piece of the input data into the physically unclonable circuit;
processing the obtained k responses into k′ pieces to concatenate each of the obtained k′ pieces of the responses by j′ repetitions;
further concatenating the j′ responses for all of the k′ pieces to obtain (j′×k′) responses for each piece of the input data;
and further concatenating the (j′×k′) responses for each piece of the input data also for different input data;
and generating synthesized output data including (i×j′×k′) responses;
a fourth step of deciding whether or not the synthesized output data is in a same range as the reference data;
and
a fifth step of determining whether or not an error rate of the synthesized output data is within a preset range as a result of the decision in the fourth step,
wherein if the error rate is determined not to be within the preset range in the fifth step, at least one of the i, j, j′, k, and k′ is changed to repeat the first through fifth steps until the error rate falls within the preset range.

16 more elements

A method for controlling an error rate of device-specific information, the method comprising:

a first step of initially setting input data into a physically unclonable circuit;
a second step of:
inputting each of i (i is an arbitrary natural number) pieces of the initially set input data, j times (j is an arbitrary natural number), into the physically unclonable circuit;
processing j responses into j′ pieces (j′ is an arbitrary natural number, and 0<j′≦j);
and storing them in a storage means beforehand in association with each piece of the input data;
a third step of:
inputting the i pieces of input data into the storage means;
reading the j′ responses corresponding to the respective i pieces of the input data from the storage means to concatenate the j′ responses for each piece of the input data;
further concatenating the concatenated data by k′ repetitions (k′ is an arbitrary natural number and 0<k′≦k, where k is an arbitrary natural number, and k is 2 or more when the i and the j are both 1) to obtain the (j′×k′) responses concatenated for each piece of the input data;
and further concatenating the obtained responses also for different input data to obtain (i×j′×k′) concatenated responses and thereby generate reference data;
a fourth step of:
inputting the i pieces of input data, k times, for each piece of the input data into the physically unclonable circuit;
processing the obtained k responses into k′ pieces;
concatenating the obtained k′ responses by j′ repetitions for each of the responses;
further concatenating them for all of the k′ pieces;
further concatenating the concatenated (j′×k′) responses also for different input data;
and obtaining concatenated (i×j′×k′) responses to generate synthesized output data;
a fifth step of deciding whether or not the synthesized output data is in a same range as the reference data;
and
a sixth step of determining whether or not an error rate of the synthesized output data is within a preset range as a result of the decision in the fifth step,
wherein if the error rate is determined not to be within the preset range in the sixth step, the input data is changed to repeat the first to sixth steps until the error rate falls within the preset range.

18 more elements

A program for controlling an error rate of device-specific information for causing a computer to perform:

a first procedure of:
inputting each of i (i is an arbitrary natural number) pieces of input data, j times (j is an arbitrary natural number), into a physically unclonable circuit;
processing j responses into j′ pieces (j′ is an arbitrary natural number, and 0<j′≦j);
and storing them in a storage means beforehand in association with each piece of the input data;
a second procedure of:
inputting the i pieces of input data into the storage means;
reading the j′ responses corresponding to the respective i pieces of the input data from the storage means;
concatenating the j′ responses for each piece of the input data;
further concatenating the concatenated data by k′ repetitions (k′ is an arbitrary natural number and 0<k′≦k, where k is an arbitrary natural number, and k is 2 or more when the i and the j are both 1);
obtaining the (j′×k′) responses concatenated for each piece of the input data;
and further concatenating the obtained responses also for different input data to obtain concatenated (i×j′×k′) responses and thereby generate reference data;
a third procedure of:
inputting the i pieces of input data, k times, for each piece of the input data into the physically unclonable circuit;
processing obtained k responses into k′ pieces;
concatenating the obtained k′ responses by j′ repetitions for each the responses;
further concatenating them for all of the k′ pieces;
and further concatenating the concatenated (j′×k′) responses also for different input data to obtain concatenated (i×j′×k′) responses and thereby generate synthesized output data;
a fourth procedure of deciding whether or not the synthesized output data is in a same range as the reference data;
and
a fifth procedure of determining whether or not an error rate of the synthesized output data is within a preset range as a result of the decision in the fourth procedure,
wherein if the error rate is determined not to be within the preset range in the fifth procedure, at least one of the i, j, j′, k, and k′ is changed to repeat the first through fifth procedures until the error rate falls within the preset range.

18 more elements

A program for controlling an error rate of device-specific information for causing a computer to perform:

a first procedure of initially setting input data into a physically unclonable circuit;
a second procedure of:
inputting each of i pieces (i is an arbitrary natural number) of the initially set input data, j times (j is an arbitrary natural number), into the physically unclonable circuit;
processing j responses into j′ pieces (j′ is an arbitrary natural number, and 0<j′≦j);
and storing them in a storage means beforehand in association with each piece of the input data;
a third procedure of:
inputting the i pieces of input data into the storage means;
reading j′ responses corresponding to the respective i pieces of the input data from the storage means;
concatenating the j′ responses for each piece of the input data;
further concatenating the concatenated data by k′ repetitions (k′ is an arbitrary natural number and 0<k′≦k, where k is an arbitrary natural number, and k is 2 or more when the i and the j are both 1);
obtaining the concatenated (j′×k′) responses for each piece of the input data;
and further concatenating the obtained responses also for different input data to obtain concatenated (i×j′×k′) responses and thereby generate reference data;
a fourth procedure of:
inputting the i pieces of input data, k times, for each piece of the input data into the physically unclonable circuit;
processing obtained k responses into k′ pieces;
concatenating obtained k′ responses by j′ repetitions for each of the responses;
further concatenating them for all of the k′ pieces;
further concatenating the concatenated (j′×k′) responses also for different input data;
and obtaining concatenated (i×j′×k′) responses so as to generate synthesized output data;
a fifth procedure of deciding whether or not the synthesized output data is in a same range as the reference data;
and
a sixth procedure of determining whether or not an error rate of the synthesized output data is within a preset range as a result of the decision in the fifth procedure,
wherein if the error rate is determined not to be within the preset range in the sixth procedure, the input data is changed to repeat the first to sixth procedures until the error rate falls within the preset range.

20 more elements

A method for controlling an error rate of device-specific information, the method comprising:

a first step of:
inputting each of i (i is an arbitrary natural number) pieces of input data, j times (j is an arbitrary natural number), into a physically unclonable circuit;
processing j responses into j′ pieces (j′ is an arbitrary natural number, and 0<j′≦j);
and storing them in a storage means beforehand in association with each piece of the input data;
a second step of:
inputting the i pieces of the input data into the storage means;
reading the j′ responses corresponding to the respective i pieces of the input data from the storage means to concatenate the obtained j′ responses for each piece of the input data;
further concatenating the concatenated data by k′ repetitions (k′ is an arbitrary natural number and 0<k′≦k, where k is an arbitrary natural number, and k is 2 or more when the i and the j are both 1);
and further concatenating the obtained data for i pieces for different input data to generate reference data;
a third step of:
inputting the i pieces of the input data, k times, for each piece of the input data into the physically unclonable circuit;
processing the obtained k responses into k′ pieces to concatenate each of the obtained k′ pieces of the responses by j′ repetitions;
further concatenating the j′ responses for all of the k′ pieces to obtain (j′×k′) responses for each piece of the input data;
and further concatenating the (j′×k′) responses for each piece of the input data also for different input data;
and generating synthesized output data including (i×j′×k′) responses;
a fourth step of deciding whether or not the synthesized output data is in a same range as the reference data;
and
a fifth step of determining whether or not an error rate of the synthesized output data is within a preset range as a result of the decision in the fourth step,
wherein if the error rate is determined not to be within the preset range in the fifth step, at least one of the i, j, j′, k, and k′ is changed to repeat the first through fifth steps until the error rate falls within the preset range, and
only any one or two of the i, j, and k are a constant 1.

17 more elements

A program for controlling an error rate of device-specific information for causing a computer to perform:

a first procedure of:
inputting each of i (i is an arbitrary natural number) pieces of input data, j times (j is an arbitrary natural number), into a physically unclonable circuit;
processing j responses into j′ pieces (j′ is an arbitrary natural number, and 0<j′≦j);
and storing them in a storage means beforehand in association with each piece of the input data;
a second procedure of:
inputting the i pieces of input data into the storage means;
reading the j′ responses corresponding to the respective i pieces of the input data from the storage means;
concatenating the j′ responses for each piece of the input data;
further concatenating the concatenated data by k′ repetitions (k′ is an arbitrary natural number and 0<k′≦k, where k is an arbitrary natural number, and k is 2 or more when the i and the j are both 1);
obtaining the (j′×k′) responses concatenated for each piece of the input data;
and further concatenating the obtained responses also for different input data to obtain concatenated (i×j′×k′) responses and thereby generate reference data;
a third procedure of:
inputting the i pieces of input data, k times, for each piece of the input data into the physically unclonable circuit;
processing obtained k responses into k′ pieces;
concatenating the obtained k′ responses by j′ repetitions for each the responses;
further concatenating them for all of the k′ pieces;
and further concatenating the concatenated (j′×k′) responses also for different input data to obtain concatenated (i×j′×k′) responses and thereby generate synthesized output data;
a fourth procedure of deciding whether or not the synthesized output data is in a same range as the reference data;
and
a fifth procedure of determining whether or not an error rate of the synthesized output data is within a preset range as a result of the decision in the fourth procedure,
wherein if the error rate is determined not to be within the preset range in the fifth procedure, at least one of the i, j, j′, k, and k′ is changed to repeat the first through fifth procedures until the error rate falls within the preset range, and
only any one or two of the i, j, and k are a constant 1.

19 more elements

Dependencies are inferred from the claim text.

Method for controlling error rate of device-specific information and program for controlling error rate of device-specific information

Life of this patent

Method for controlling error rate of device-specific information and program for controlling error rate of device-specific information

Life of this patent

Abstract

Claims12