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Title:
ENCRYPTION DEVICE, ENCRYPTION/DECRYPTION SYSTEM, ENCRYPTION METHOD, AND COMPUTER PROGRAM FOR ENCRYPTION
Document Type and Number:
Japanese Patent JP2012105068
Kind Code:
A
Abstract:

To improve data confidentiality of an encryption device.

There is provided an encryption device that comprises: an authentication unit that authenticates a registration entity of a cipher key created by a public key encryption system; a cipher key storage unit that stores the cipher key registered by the registration entity authenticated by the authentication unit; a common key storage unit that stores a common key created by a common key encryption system; an encryption common key storage unit that stores the common key encrypted by the cipher key stored in the cipher key storage unit; an encryption unit that encrypts data, which are generated repeatedly, in different ways at every predetermined timing by using the common key before deleting the data; and an encryption data storage unit that stores data encrypted by the encryption unit.


Inventors:
OWARI NOBUYUKI
Application Number:
JP2010251893A
Publication Date:
May 31, 2012
Filing Date:
November 10, 2010
Export Citation:
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Assignee:
MITSUBISHI HEAVY IND LTD
International Classes:
H04L9/08; G06F21/60; G06F21/62; H04L9/14
Domestic Patent References:
JP2006203739A2006-08-03
JP2007189456A2007-07-26
JP2006086795A2006-03-30
JPH10214233A1998-08-11
JP2006238307A2006-09-07
JP2007282064A2007-10-25
JP2005202048A2005-07-28
Attorney, Agent or Firm:
Ryuichiro Mori
Masatake Shiga
Tadashi Takahashi
Tetsuo Yamazaki
Yasushi Matsunuma



 
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