Patent ID: 11887508
Assignee: SONY GROUP CORPORATION
Field: Digital communication (Electrical engineering)
Classification: CPC G  H | IPC G  H

Claim 9:
10. An information processing method comprising, by a processor:
generating an encrypted bit string in which a hash value calculated by using keyed hashing from a keyword for an information search is mapped into a bit string having a predetermined length;
selecting a predetermined number of bits from the encrypted bit string on a basis of a dynamically generated random number, and inverting the predetermined number of selected bits;
receiving, as a search result, encrypted inverted-bit-number information corresponding to an encrypted index in which the predetermined number of bits are inverted, the encrypted index corresponding to a sent encrypted keyword;
generating inverted-bit-number information before encryption on a basis of the encrypted inverted-bit-number information;
sending the inverted-bit-number information regarding a number of inverted bits and the encrypted bit string to an external apparatus; and
calculating logical AND of the encrypted keyword and the inverted-bit-number information before the encryption to determine whether or not the search result includes an erroneous determination on a basis of a result of the calculation.