Method and equipment for encrypting/decrypting physical characteristic information, and identification system utilizing the physical characteristic information
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Accused Products
Abstract
A cryptographic method and equipment decrypting a cryptographic key by generating an auxiliary code based on a randomly determined numeric key and including a result of encryption into a cryptogram. Upon decryption, the cryptographic key is restored using the numeric key restored according to the entire cryptogram. A cryptographic method and equipment scrambles and encrypts physical characteristic information, and descrambles a result of a decryption, thereby enabling any alteration to a cryptogram to be detected because even a minor alteration thereto changes the result of the decryption. A remote identification system encrypts physical characteristic information using a password as a cryptographic key, and fluctuation of the physical characteristic information, authenticating information represented as a different bit pattern at each identifying processing is generated and sent to a transmission medium.
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Citations
13 Claims
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1-6. -6. (canceled)
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7. A cryptographic method comprising:
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receiving physical characteristic information representing a characteristic inherent to an individual;
arithmetically converting each component of said physical characteristic information by using a predetermined reversible function concerning said each component and a plurality of components having a predetermined relationship with said each component, to scramble said physical characteristic information; and
encrypting the scrambled physical characteristic information by using a predetermined cryptographic key.
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8. A decryption method comprising:
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receiving a cryptogram which is an encryption of scrambled physical characteristic information;
decrypting said cryptogram by using a predetermined cryptographic key and obtaining said scrambled physical characteristic information; and
descrambling a result of decryption to restore said physical characteristic information by arithmetically converting the result of decryption by use of an inverse function of a predetermined function used in the scrambling.
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9. A cryptographic equipment comprising:
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an inputting unit inputting physical characteristic information representing a characteristic inherent to an individual;
a scrambling unit arithmetically converting each component of said physical characteristic information by using a predetermined reversible function concerning said each component and a plurality of components having a predetermined relationship with said each component, to scramble said physical characteristic information; and
an encrypting unit encrypting the scrambled physical characteristic information by using the predetermined cryptographic key.
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10. A decryption equipment comprising:
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a decrypting unit decrypting a received cryptogram which is an encryption of a scrambled physical characteristic information, by a predetermined cryptographic key and obtaining said scrambled physical characteristic information; and
a descrambling unit descrambling a result of decryption to restore said physical characteristic information by arithmetically converting the result of decryption by use of an inverse function of a predetermined function used in the scrambling.
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11. A storage media storing a program to read and be executed by a computer, comprising:
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a inputting procedure inputting physical characteristic information representing a characteristic inherent to an individual;
a scrambling procedure arithmetically converting each component of said physical characteristic information by using a predetermined reversible function concerning said each component and a plurality of components having a predetermined relationship with said each component, to scramble said physical characteristic information; and
an encrypting procedure encrypting the scrambled physical characteristic information by using the predetermined cryptographic key.
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12. A storage media for storing a program to read and be executed by a computer, comprising:
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a decrypting procedure for decrypting a received cryptogram which is an encryption of a scrambled physical characteristic information, by a predetermined cryptographic key and obtaining said scrambled physical characteristic information; and
a descrambling procedure descrambling a result of decryption to restore said by arithmetically converting the result of decryption by use of an inverse function of a predetermined function used in the scrambling.
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13-15. -15. (canceled)
Specification