Cryptographic processing method and cryptographic processing device
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United States of America Patent
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Jan 16, 2018
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N/A
app pub date -
Aug 20, 2015
filing date -
Oct 10, 2014
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Abstract
A computer generates a third encrypted polynomial that corresponds to a result of encrypting a third polynomial by use of a result of multiplying a first encrypted polynomial by a second encrypted polynomial, and outputs cryptographic information that represents the third encrypted polynomial. The first encrypted polynomial is a polynomial obtained by encrypting a first polynomial that corresponds to a first vector, and the second encrypted polynomial is a polynomial obtained by encrypting a second polynomial that corresponds to a second vector. The third polynomial includes a first term that has a coefficient based on an inner product of the first vector and the second vector and a second term other than the first term, in which a coefficient of the second term is masked.
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