Encrypting method, deciphering method and certifying method
First Claim
1. An encrypting method comprising:
- a first step, of inputting as a key, predetermined information associated with attribute information of an entity;
a second step, of inputting the attribute information of the entity;
a third step, of normalizing the attribute information input in said second step to be subject to a comparison processing;
a fourth step, of comparing the attribute information normalized in said third step and attribute information obtained based on the key input in said first step; and
a fifth step, of, when said fourth step results in the attribute information provided in said third step being identical with the attribute information obtained based on the input key, encrypting information to be communicated by using the key.
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Abstract
Predetermined information, correlated with the attribute information of an entity, is used as the secret key for encrypting in the public key cipher system or as the secret key for deciphering the enciphered information, thereby enabling to certify the adequacy of the encrypting or deciphering entity at the destination or source of communication. Also predetermined information, correlated with the attribute information of an entity, is used as the public key for encrypting in the public key cipher system or as the public key for deciphering the encrypted information, thereby enabling to certify the adequacy of the entity at the destination or source of communication, at the encrypting or deciphering side.
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Citations
28 Claims
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1. An encrypting method comprising:
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a first step, of inputting as a key, predetermined information associated with attribute information of an entity;
a second step, of inputting the attribute information of the entity;
a third step, of normalizing the attribute information input in said second step to be subject to a comparison processing;
a fourth step, of comparing the attribute information normalized in said third step and attribute information obtained based on the key input in said first step; and
a fifth step, of, when said fourth step results in the attribute information provided in said third step being identical with the attribute information obtained based on the input key, encrypting information to be communicated by using the key. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A decoding method comprising:
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a first step, of inputting as a key, predetermined information associated with attribute information of an entity;
a second step, of inputting the attribute information of the entity;
a third step, of normalizing the attribute information input in said second step to be subjected to a comparison processing;
a fourth step, of comparing the attribute information normalized in said third step and attribute information obtained on the key input in said first step; and
a fifth step, of, when said fourth step results in the attribute information provided in said third step being identical with the attribute information obtained based on the input key, decoding encrypted information by using the key. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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- 25. A certifying method for judging correspondence between information of an entity by comparing predetermined information, correlated with attribute information of said entity, with attribute information of the entity obtained by separately observing the attribute of said entity, wherein the separately observed attribute information is normalized prior to the comparison.
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28. A computer-readable storage medium for storing a program for executing an encrypting method, said encrypting method comprising:
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a first step, of inputting as a key, predetermined information associated with attribute information of an entity;
a second step, of inputting the attribute information of the entity;
a third step, of normalizing the attribute information input in said second step to be subject to a comparison processing;
a fourth step, of comparing the attribute information normalized in said third step and attribute information obtained based on the key input in said first step; and
a fifth step, of, when said fourth step results in attribute information provided in said third step being identical with the attribute information obtained based on the input key, encrypting information to be communicated by using the key.
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Specification