Encryption system with time-dependent decryption

a technology of encryption system and time-dependent decryption, which is applied in the field of encryption system with time-dependent decryption, can solve the problems that the general certificate cannot be added to the condition for limiting the time during which user a can decrypt data, and the technique does not teach a method for designing a time for enabling decryption of encrypted data

Inactive Publication Date: 2001-12-13
IBM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, a condition for limiting the time during which user A can decrypt data can not be added to the general certificate.
However, this technique does not teach a method for designating a time for enabling decryption of encrypted data.

Method used

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  • Encryption system with time-dependent decryption
  • Encryption system with time-dependent decryption
  • Encryption system with time-dependent decryption

Examples

Experimental program
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Embodiment Construction

[0035] The preferred embodiment of the present invention will now be described while referring to the drawings. FIG. 5 is a schematic diagram illustrating an example hardware arrangement for a system according to the present invention. A system 100 includes a central processing unit (CPU) 1 and a memory 4. The CPU 1 and the memory 4 communicate across a bus 2 with a hard disk drive 13, which is an auxiliary storage device. A floppy disk drive (or a memory medium driver for an MO or a CD-ROM) 20 is connected to the bus 2 via a floppy disk controller 19.

[0036] A floppy disk (or a memory medium for an MO or a CD-ROM) is inserted into the floppy disk drive (or a memory medium driver for an MO or a CD-ROM) 20. Code for a computer program for accomplishing the present invention can be recorded on the floppy disk or the hard disk drive 13, or in a ROM 14. The computer program, which interacts with an operating system to issue commands to the CPU 1, is loaded into the memory 4 for execution...

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PUM

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Abstract

An object of the invention is to provide an encryption system and method for inhibiting the decryption of encrypted data unless a decryption condition is satisfied. Thus, according to the present invention, in order to provide the encryption system for inhibiting the decryption of encrypted data unless a decryption condition is satisfied, decryption enabled time is designated as a decryption condition, and an encryption system incorporating time-dependent decryption is constituted by a time-key certificate and a time-key certificate manager. A time-key certificate is employed when a third party proves that a public encryption key added to the certificate satisfies the decryption condition. The time-key certificate manager issues a time-key certificate and then manages a decryption key.

Description

[0001] The present invention is directed to the field of encryption. It is more specifically directed to an encryption system.Background Art[0002] An explanation will be given for a difference between the use of a general certificate and the use of a time-key certificate.[0003] The use of a general certificate is shown in FIG. 1. When user B desires to encrypt data (M) and to transmit the encrypted data to user A, user B requests that a certification authority issue a certificate for user A. This certificate includes the name of user A and a public encryption key (KEa) for user A, and also the digital signature of the certification authority for all the contents. User B obtains the certificate for user A and confirms that the certification authority has provided the digital signature for the public encryption key for user A. If the digital signature is correct, user B encrypts the target message M by using the public encryption key (KEa) for user A, and transmits the encrypted messa...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H04L9/08G06Q10/00G06Q20/00G06Q20/02G06Q20/06G06Q20/30G06Q20/36G06Q30/06G06Q30/08G06Q40/00G06Q40/02G06Q50/00G06Q50/10G06Q50/34H04L9/32
CPCH04L9/321H04L9/3263H04L9/3297H04L9/3294
Inventor KUDO, MICHIHARUNUMAO, MASAYUKIKAWAZOE, HIROSHI
Owner IBM CORP
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