The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 15, 2024
Filed:
Jul. 17, 2019
Nec Corporation, Tokyo, JP;
NEC CORPORATION, Tokyo, JP;
Abstract
Provided is an encryption system that suppresses a communication cost from a key issuing system to a user and controls input to a function in the unit of data. The encryption system includes an encrypting apparatus, a signature apparatus, and a security execution apparatus. The encrypting apparatus generates pseudo-random numbers different for respective pieces of data, and encrypts the generated pseudo-random numbers together with the pieces of data. The signature apparatus regenerates the pseudo-random numbers used by the encrypting apparatus for encrypting the respective pieces of data, and generates control information for certifying validity of the pieces of the data from the regenerated pseudo-random numbers. The security execution apparatus verifies the control information based on the pseudo-random numbers obtained by decrypting ciphertexts of the pieces of the data, and calculates a function value of data obtained by decrypting the ciphertexts when the verification of the control information is successful.