METHOD FOR MANAGING ELECTRONIC FILE AND ELECTRONIC FILE MANAGEMENT APPARATUS
First Claim
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1. A method for managing an electronic file, comprising:
- creating an electronic signature of a user who is generating an electronic file by encrypting the electronic file using a private key of the user; and
embedding the created electronic signature of the user and a public key certificate of the user, in the electronic file,the public key certificate of the user certifying a public key of the user corresponding to the private key of the user and including a link to a certificate list that shows whether or not the public key certificate of the user is valid.
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Abstract
In accordance with one embodiment, a method for managing an electronic file include creating an electronic signature of a user who is generating an electronic file by encrypting the electronic file using a private key of the user, and embedding the created electronic signature of the user and a public key certificate of the user, in the electronic file. The public key certificate of the user certifying a public key of the user corresponding to the private key of the user and including a link to a certificate list that shows whether or not the public key certificate of the user is valid.
17 Citations
20 Claims
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1. A method for managing an electronic file, comprising:
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creating an electronic signature of a user who is generating an electronic file by encrypting the electronic file using a private key of the user; and embedding the created electronic signature of the user and a public key certificate of the user, in the electronic file, the public key certificate of the user certifying a public key of the user corresponding to the private key of the user and including a link to a certificate list that shows whether or not the public key certificate of the user is valid. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for managing an electronic file, comprising:
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acquiring from a time stamp authority a time stamp of an electronic file and a public key certificate of the time stamp authority, and embedding the acquired time stamp of the electronic file and the acquired public key certificate of the time stamp authority, in the electronic file, wherein the public key certificate of the time stamp authority certifies a public key of the time stamp authority corresponding to a private key of the time stamp authority and includes a link to a certificate list that shows whether or not the public key certificate of the time stamp authority is valid. - View Dependent Claims (10, 11, 12, 13)
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14. An electronic file management apparatus comprising:
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a controller configured to; create an electronic signature of a user who is generating an electronic file by encrypting the electronic file using a private key of the user; and embed the created electronic signature of the user and a public key certificate of the user, in the electronic file, the public key certificate of the user certifying a public key of the user corresponding to the private key of the user and including a link to a certificate list that shows whether or not the public key certificate of the user is valid. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification