復号装置、暗号化装置及び暗号システム

Title:

復号装置、暗号化装置及び暗号システム

Document Type and Number:

Japanese Patent JP6971917

Kind Code:

B2

Abstract:

An inner-product functional encryption scheme in which the maximum length of a ciphertext and the maximum length of a secret key are not restricted can be constructed. An encryption device (20) generates a ciphertext ct_x in which a vector x is encrypted, using encryption setting information that is of a size depending on the size of the vector x and is generated using as input public information of a fixed size. A key generation device (30) generates a secret key sk_y in which a vector y is set, using key setting information that is of a size depending on the size of the vector y and is generated using as input the public information. A decryption device (40) decrypts the ciphertext ct_x with the secret key sk_y to calculate an inner-product value of the vector x and the vector y.

Inventors:

Katsuyuki Takashima
Junichi Tomita

Application Number:

JP2018110987A

Publication Date:

November 24, 2021

Filing Date:

June 11, 2018

Export Citation:

Click for automatic bibliography generation Help

Assignee:

Mitsubishi Electric Corporation
Nippon Telegraph and Telephone Corporation

International Classes:

H04L9/30; G09C1/00

Foreign References:

WO2014061324A1

Other References:

DATTA, P., OKAMOTO, T. and TOMIDA, J.,Full-Hiding (Unbounded) Mulit-Input Inner Product Functional Encryption from the k-Linear Assumption,Cryptology ePrint Archive,Report 2018/061,[online],2018年02月,pp.1-38,,[2021年8月10日検索]
SANS, E. D. and POINTCHEVAL, D.,Unbounded Inner-Product Functional Encryption with Succinct Keys,Cryptology ePrint Archive,Report 2018/487,[online],2018年05月,pp.1-15,,[2021年8月10日検索]
光生滋生,クラウドを支えるこれからの暗号技術,株式会社秀和システム,2015年07月01日,pp.124-132

Attorney, Agent or Firm:

Mizoi International Patent Service Corporation

Previous Patent: Improved system for gripping / releasing wefts on projectile looms

Next Patent: Refrigerant state detector