Solid-state imaging device, method for driving solid-state imaging device, and electronic apparatus

A method for driving a solid-state imaging device including:

• a pixel part having a plurality of pixels arranged in a matrix pattern, the pixels having a photoelectric converting function;
• and
• a reading part for reading a pixel signal from the pixel part,
• wherein the method comprises steps of:
• acquiring at least one selected from the group consisting of variation information of the pixels and variation information of the reading part;
• and
• generating response data including a unique key in association with the variation information acquired in the acquiring step, using a fuzzy extractor, and
• wherein, in the response data generating step, when a key is regenerated, a unique key is generated using helper data acquired in generation of an initial key, variation information acquired in the regeneration of the key, and reliability information determined based on the variation information acquired in the regeneration of the key;
• wherein the fuzzy extractor includes:
• an initial key generating part for generating the initial key and the helper data based on variation information acquired as a response when the initial key is generated;
• and
• a key regenerating part for, when a key is regenerated, generating a unique key in a soft-decision manner using the helper data acquired in generation of the initial key, variation information acquired as a response including an error when the key is regenerated, and reliability information determined based on the variation information acquired in the regeneration of the key;
• wherein the initial key generating part includes:
• a first hash part for subjecting the variation information W, which is acquired as a response, to a hash function (Hash) to acquire a hash value and outputting the hash value as the initial key;
• and
• an exclusive OR part for performing an exclusive OR operation on the acquired variation information W and a codeword C of an error correction code generated using a random number and output a result of the exclusive OR operation (WxorC) as the helper data;
• wherein the key regenerating part includes:
• a reliability information acquiring part for acquiring the reliability information Q determined based on the variation information acquired as a response including an error when the key is regenerated;
• a first multiplier for performing a multiplication on the reliability information Q and the variation information W(x)E acquired as a response including an error when the key is regenerated, to acquire first data W(x)E(x)Q;
• a second multiplier for performing a multiplication on the helper data W(x)C and the first data including the reliability information Q to acquire second data C(x)E(x)Q resulting from a multiplication on the codeword C of the error correction code, an error component E and the reliability information Q;
• an error correcting part for decoding the second data C(x)E(x)Q using correlation decoding using the reliability information Q to acquire an estimated codeword C′;
• a third multiplier for performing a multiplication on the estimated codeword C′ provided by the error correcting part and the helper data W(x)C to acquire estimated variation information W′;
• and
• a second hash part for subjecting the estimated variation information W′ to a hash function (Hash) to acquire a hash value and outputting the hash value as a regenerated key.

An electronic apparatus comprising:

• a solid-state imaging device;
• and
• an optical system for forming a subject image on the solid-state imaging device,
• wherein the solid-state imaging device includes:
• a pixel part having a plurality of pixels arranged in a matrix pattern, the pixels having a photoelectric converting function;
• a reading part for reading a pixel signal from the pixel part;
• and
• a response data generating part including a fuzzy extractor, the response data generating part generating response data including a unique key in association with at least one selected from the group consisting of variation information of the pixels and variation information of the reading part, and
• wherein the response data generating part generates, when regenerating a key, a unique key using helper data acquired in generation of an initial key, variation information acquired in the regeneration of the key, and reliability information determined based on the variation information acquired in the regeneration of the key;
• wherein the fuzzy extractor includes:
• an initial key generating part for generating the initial key and the helper data based on variation information acquired as a response when the initial key is generated;
• and
• a key regenerating part for, when a key is regenerated, generating a unique key in a soft-decision manner using the helper data acquired in generation of the initial key, variation information acquired as a response including an error when the key is regenerated, and reliability information determined based on the variation information acquired in the regeneration of the key;
• wherein the initial key generating part includes:
• a first hash part for subjecting the variation information W, which is acquired as a response, to a hash function (Hash) to acquire a hash value and outputting the hash value as the initial key;
• and
• an exclusive OR part for performing an exclusive OR operation on the acquired variation information W and a codeword C of an error correction code generated using a random number and output a result of the exclusive OR operation (WxorC) as the helper data;
• wherein the key regenerating part includes:
• a reliability information acquiring part for acquiring the reliability information Q determined based on the variation information acquired as a response including an error when the key is regenerated;
• a first multiplier for performing a multiplication on the reliability information Q and the variation information W(x)E acquired as a response including an error when the key is regenerated, to acquire first data W(x)E(x)Q;
• a second multiplier for performing a multiplication on the helper data W(x)C and the first data including the reliability information Q to acquire second data C(x)E(x)Q resulting from a multiplication on the codeword C of the error correction code, an error component E and the reliability information Q;
• an error correcting part for decoding the second data C(x)E(x)Q using correlation decoding using the reliability information Q to acquire an estimated codeword C′;
• a third multiplier for performing a multiplication on the estimated codeword C′ provided by the error correcting part and the helper data W(x)C to acquire estimated variation information W′;
• and
• a second hash part for subjecting the estimated variation information W′ to a hash function (Hash) to acquire a hash value and outputting the hash value as a regenerated key.