A decoding service provision system, a processing unit, a safety assessment device, a program, and a recording medium - Nippon Telegraph and Telephone Corporation

Title:

A decoding service provision system, a processing unit, a safety assessment device, a program, and a recording medium

Document Type and Number:

Japanese Patent JP6006809

Kind Code:

B2

Abstract:

A private key is held which conforms to an ElGamal encryption system on a semigroup, calculation of an order of an element of the semigroup being computationally difficult, information corresponding to ciphertext conforming to the ElGamal encryption system is input, a private key s is used to decrypt the information corresponding to the ciphertext in conformance to the ElGamal encryption system, and information corresponding to a result of decrypting the ciphertext is obtained and output. Alternatively, whether it is computationally difficult or easy to calculate the order of the element of the semigroup is determined, and the safety of a decryption service providing device is evaluated based on the determination result.

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Inventors:

Tetsutaro Kobayashi
Tsuyoshi Yamamoto
Fuji Hitoshi
Tomohide Yamamoto
Rei Yoshida

Application Number:

JP2014557480A

Publication Date:

October 12, 2016

Filing Date:

January 15, 2014

Export Citation:

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Assignee:

Nippon Telegraph and Telephone Corporation

International Classes:

H04L9/30; G09C1/00

Domestic Patent References:

JPH10301491A	1998-11-13
JP2012151756A	2012-08-09
JP2007507175A	2007-03-22
JPH10301491A	1998-11-13
JP2012151756A	2012-08-09
JP2007507175A	2007-03-22

Other References:

JPN6013062708; Ｂｏｎｅｈ，　Ｄ．　ｅｔ　ａｌ．: 'Ａ　Ｍｅｔｈｏｄ　ｆｏｒ　Ｆａｓｔ　Ｒｅｖｏｃａｔｉｏｎ　ｏｆ　Ｐｕｂｌｉｃ　Ｋｅｙ　Ｃｅｒｔｉｆｉｃａｔｅｓ　ａｎｄ　Ｓｅｃｕｒｉｔｙ　Ｃａｐａｂｉｌｉｔｉｅｓ' Ｐｒｏｃｅｅｄｉｎｇｓ　ｏｆ　ｔｈｅ　１０ｔｈ　ＵＳＥＮＩＸ　Ｓｅｃｕｒｉｔｙ　Ｓｙｍｐｏｓｉｕｍ , 2001, Ｔｈｅ　Ｉｎｔｅｒｎｅｔ
JPN6013062708; Ｂｏｎｅｈ，　Ｄ．　ｅｔ　ａｌ．: 'Ａ　Ｍｅｔｈｏｄ　ｆｏｒ　Ｆａｓｔ　Ｒｅｖｏｃａｔｉｏｎ　ｏｆ　Ｐｕｂｌｉｃ　Ｋｅｙ　Ｃｅｒｔｉｆｉｃａｔｅｓ　ａｎｄ　Ｓｅｃｕｒｉｔｙ　Ｃａｐａｂｉｌｉｔｉｅｓ' Ｐｒｏｃｅｅｄｉｎｇｓ　ｏｆ　ｔｈｅ　１０ｔｈ　ＵＳＥＮＩＸ　Ｓｅｃｕｒｉｔｙ　Ｓｙｍｐｏｓｉｕｍ , 2001, Ｔｈｅ　Ｉｎｔｅｒｎｅｔ

Attorney, Agent or Firm:

Naoki Nakao
Yukio Nakamura
Yoshimura Munehiro

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