Encryption key generating apparatus and computer program product

摘要

According to an embodiment, an encryption key generating apparatus includes a converting unit to convert input data using a physically unclonable function and outputs output data; a memory to store a plurality of pattern data, each of which is a partial data in the output data indicated by one of a plurality of index data; a generating unit to generates an encryption key on the basis of the plural of index data; and a comparing unit to compare the output data with the plural of pattern data to detect plural of locations in the output data at which partial data similar to the plural of pattern data is present. The generating unit reproduces, as the plural of index data, the plural of locations detected by the comparing unit and reproduces the encryption key on the basis of the plural of index data that have been reproduced.

主权项

1. An encryption key generating apparatus that generates an encryption key during an encryption key setting operation and reproduces the encryption key during an encryption key reproducing operation, the apparatus comprising:
a converting circuit configured to convert input data with the use of a physically unclonable function and output data; a confidential data generating circuit configured to generate confidential data that indicates an amount of cyclic shift applied to the output data; an output shifting circuit configured to cyclically shift the output data by the amount of cyclic shift indicated by the confidential data; a memory control circuit to store the cyclically shifted output data as pattern data in a memory; a comparing circuit configured to, while cyclically shifting the output data, compare reference data, which is obtained in a sequential manner by cyclically bit-shifting the output data by one bit each time, with the pattern data and determine whether or not the reference data is similar to the pattern data so as to detect an amount of cyclic shift at the time when the reference data is similar to the pattern data, wherein on the basis of the amount of cyclic shift detected by the comparing circuit, the confidential data is reproduced; during the encryption key setting operation using the converting circuit, the confidential data generating circuit, the output shifting circuit, and the memory control circuit, the apparatus generates one encryption key by using a total round number, R, of confidential data that are generated through R times of round operations and stores R number of pattern data in the memory, andduring the encryption key reproducing operation using the converting circuit and the comparing circuit, the apparatus reproduces the one encryption key by using the R number of confidential data that are reproduced through the R times of round operations.