Encrypted-data processing method, system, and apparatus

Patent metadata

Field	Value
Publication number	US-10115323-B2
Application number	US-201615259632-A
Country	US
Kind code	B2
Filing date	Sep 8, 2016
Priority date	Sep 11, 2015
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

A first code is generated from data by using a second error correction encoding method, and a second code is generated from the first code and a first random number by using a first error correction encoding method. First masked data is generated by masking registration target data by using the second code, and the first masked data is registered in a database. A third code is generated from a second random number by using the first error correction encoding method. Second masked data is generated by masking matching target data by using the third code. Synthesized data is generated by synthesizing the second masked data and the first masked data registered in the database, and the synthesized data is decoded in accordance with the first error correction encoding method and the second error correction encoding method.

First claim

What is claimed is:

1. An encrypted-data processing method comprising:
generating a first code from secret information by using a second error correction encoding method and generating a second code from the first code and a first random number by using a first error correction encoding method;
generating first masked data by masking a first biometric feature code as registration target by using the second code and registering the first masked data in a database;
generating a third code from a second random number by using the first error correction encoding method;
generating second masked data by masking a second biometric feature code as matching target by using the third code; and
generating synthesized data by synthesizing the second masked data and the first masked data registered in the database and decoding the synthesized data in accordance with the first error correction encoding method and the second error correction encoding method.

2. The encrypted-data processing method according to claim 1 , further comprising:
generating a first hash value from the secret information by using a hash function and registering the first hash value in the database;
generating a second hash value from a decoding result of the synthesized data by using the hash function; and
comparing the second hash value with the first hash value registered in the database.

3. The encrypted-data processing method according to claim 1 ,
wherein the first error correction encoding method is a linear encoding method, and the second error correction encoding method is a linear encoding method or a non-linear encoding method.

4. An encrypted-data processing apparatus comprising:
a storage device; and
a processor that
generates a first code from secret information by using a second error correction encoding method,
generates a second code from the first code and a first random number by using a first error correction encoding method,
generates first masked data by masking a first biometric feature code as registration target by using the second code,
registers the first masked data in the storage device,
generates a third code from a second random number by using the first error correction encoding method,
generates second masked data by masking a second biometric feature code as matching target by using the third code,
generates synthesized data by synthesizing the second masked data and the first masked data registered in the storage device, and
decodes the synthesized data in accordance with the first error correction encoding method and the second error correction encoding method.

5. A non-transitory computer-readable recording medium storing a computer program that causes a computer to perform a procedure comprising:
generating a first code from secret information by using a second error correction encoding method and generating a second code from the first code and a first random number by using a first error correction encoding method;
generating first masked data by masking a first biometric feature code as registration target by using the second code and registering the first masked data in a database;
generating a third code from a second random number by using the first error correction encoding method;
generating second masked data by masking a second biometric feature code as matching target by using the third code; and
generating synthesized data by synthesizing the second masked data and the first masked data registered in the database and decoding the synthesized data in accordance with the first error correction encoding method and the second error correction encoding method.

Assignees

• Fujitsu Ltd

Inventors

• Yasuda Masaya

Classifications

• G09C1/00 Primary

  Apparatus or methods whereby a given sequence of signs, e.g. an intelligible text, is transformed into an unintelligible sequence of signs by transposing the signs or groups of signs or by replacing them by others according to a predetermined system (cryptographic typewriters G09C3/00) · CPC title

• H04L2209/34

  Encoding or coding, e.g. Huffman coding or error correction · CPC title

• H04L2209/12

  Details relating to cryptographic hardware or logic circuitry · CPC title

• H04L9/3231 Primary

  Biological data, e.g. fingerprint, voice or retina (network architectures or network communication protocols for supporting authentication of entities using biometrical features in a packet data network H04L63/0861) · CPC title

• H04L9/0643

  Hash functions, e.g. MD5, SHA, HMAC or f9 MAC · CPC title