Biometric identification method and system

A system comprising:

• at least one biometric data input device;
• and
• a biometric verifier connected to the at least one biometric data input device,
• wherein each of the at least one biometric data input device comprises:
• a biometric data sensor for inputting as biometric data a physical characteristic of an individual to produce digital biometric data;
• and
• an encryptor for encrypting the digital biometric data using an encryption key to transmit encrypted data to the biometric verifier, wherein the encryption key identifies the biometric data input device, and
• the biometric verifier comprises:
• a table storing an encryption key corresponding to each of said at least one biometric data input device;
• a decryptor for decrypting the encrypted data using the encryption key corresponding to the biometric data input device to reproduce digital biometric data;
• a comparator for comparing a feature of the digital biometric data against previously registered biometric features to produce a comparison result;
• and
• a determiner for determining whether the individual is an authorized person, based on the comparison result and correctness of the digital biometric data decrypted by the decryptor.

A system comprising:

• at least one biometric data input device;
• and
• a biometric verifier connected to the at least one biometric data input device,
• wherein each of the at least one biometric data input device comprises:
• a biometric data sensor for inputting as biometric data a physical characteristic of an individual to produce digital biometric data;
• a watermark encoder for embedding secret information as a watermark in the digital biometric data to produce watermarked biometric data;
• an encryptor for encrypting the watermarked biometric data to produce encrypted data;
• and
• a transmitter for transmitting the encrypted data and a device identification identifying the biometric data input device to the biometric verifier, and
• the biometric verifier comprises:
• a table storing secret information corresponding to a device identification for each of said at least one biometric data input device;
• a decryptor for decrypting the encrypted data to produce watermarked digital biometric data;
• a watermark decoder for separating digital biometric data and watermark data from the watermarked digital biometric data decrypted by the decryptor;
• a first comparator for comparing a feature of the digital biometric data against previously registered biometric features to produce a feature comparison result;
• a second comparator for comparing the watermark data separated by the watermark decoder with secret information corresponding to the device identification identifying the biometric data input device to produce a secret information comparison result;
• and
• a determiner for determining whether the individual is an authorized person, based on the feature comparison result and the secret information comparison result.

A system comprising:

• at least one biometric data input device;
• and
• a biometric verifier connected to the at least one biometric data input device,
• wherein each of the at least one biometric data input device comprises:
• a biometric data sensor for inputting as biometric data a physical characteristic of an individual to produce digital biometric data;
• a watermark encoder for embedding secret information as a watermark in the digital biometric data to produce watermarked biometric data;
• a first encryptor for encrypting the watermarked biometric data to produce encrypted biometric data;
• a second encryptor for encrypting the secret information using a public key of asymmetric encryption scheme to produce encrypted secret information;
• and
• a transmitter for transmitting the encrypted biometric data and the encrypted secret information, and
• the biometric verifier comprises:
• a first decryptor for decrypting the encrypted biometric data to produce watermarked digital biometric data;
• a second decryptor for decrypting the encrypted secret information to produce received secret information;
• a watermark decoder for separating digital biometric data and watermark data from the watermarked digital biometric data decrypted by the decryptor;
• a first comparator for comparing a feature of the digital biometric data against previously registered biometric features to produce a feature comparison result;
• a second comparator for comparing the watermark data separated by the watermark decoder with the received secret information to produce a secret information comparison result;
• and
• a determiner for determining whether the individual is an authorized person, based on the feature comparison result and the secret information comparison result.

A biometric data input device connected to a biometric verifier, comprising:

• a biometric data sensor for inputting as biometric data a physical characteristic of an individual to produce digital biometric data;
• a memory storing an encryption key identifying the biometric data input device;
• and
• an encryptor for encrypting the digital biometric data using the encryption key to transmit encrypted data to the biometric verifier.

A biometric data input device connected to a biometric verifier, comprising:

• a biometric data sensor for inputting as biometric data a physical characteristic of an individual to produce digital biometric data;
• a memory storing secret information corresponding to the biometric data input device;
• a watermark encoder for embedding the secret information as a watermark in the digital biometric data to produce watermarked biometric data;
• an encryptor for encrypting the watermarked biometric data to produce encrypted data;
• and
• a transmitter for transmitting the encrypted data and a device identification identifying the biometric data input device to the biometric verifier.

A biometric data input device connected to a biometric verifier, comprising:

• a biometric data sensor for inputting as biometric data a physical characteristic of an individual to produce digital biometric data;
• a watermark encoder for embedding secret information as a watermark in the digital biometric data to produce watermarked biometric data;
• a first encryptor for encrypting the watermarked biometric data to produce encrypted biometric data;
• a second encryptor for encrypting the secret information using a public key of asymmetric encryption scheme to produce encrypted secret information;
• and
• a transmitter for transmitting the encrypted biometric data and the encrypted secret information.

A biometric verifier connected to at least one biometric data input device, comprising:

• a table storing an encryption key corresponding to each of said at least one biometric data input device;
• a decryptor for decrypting encrypted data using the encryption key corresponding to a biometric data input device to reproduce digital biometric data, wherein the encrypted data is received from the biometric data input device;
• a comparator for comparing a feature of the digital biometric data against previously registered biometric features to produce a comparison result;
• and
• a determiner for determining whether the individual is an authorized person, based on the comparison result and correctness of the digital biometric data decrypted by the decryptor.

A biometric verifier connected to at least one biometric data input device, comprising:

• a table storing secret information corresponding to a device identification for each of said at least one biometric data input device;
• a decryptor for decrypting encrypted data to produce watermarked digital biometric data, wherein the encrypted data is received from a biometric data input device;
• a watermark decoder for separating digital biometric data and watermark data from the watermarked digital biometric data decrypted by the decryptor;
• a first comparator for comparing a feature of the digital biometric data against previously registered biometric features to produce a feature comparison result;
• a second comparator for comparing the watermark data separated by the watermark decoder with secret information corresponding to the device identification identifying the biometric data input device to produce a secret information comparison result;
• and
• a determiner for determining whether the individual is an authorized person, based on the feature comparison result and the secret information comparison result.

A biometric verifier connected to at least one biometric data input device, comprising:

• a first decryptor for decrypting encrypted biometric data to produce watermarked digital biometric data, wherein the encrypted data is received from a biometric data input device;
• a second decryptor for decrypting encrypted secret information to produce received secret information, wherein the encrypted secret information is received from the biometric data input device;
• a watermark decoder for separating digital biometric data and watermark data from the watermarked digital biometric data decrypted by the decryptor;
• a first comparator for comparing a feature of the digital biometric data against previously registered biometric features to produce a feature comparison result;
• a second comparator for comparing the watermark data separated by the watermark decoder with the received secret information to produce a secret information comparison result;
• and
• a determiner for determining whether the individual is an authorized person, based on the feature comparison result and the secret information comparison result.

In a system comprising:

• a biometric data input device;
• and a biometric verifier connected to the biometric data input device, a method for verifying identity of an individual, comprising the steps of:
• at the biometric data input device,
• a) inputting as biometric data a physical characteristic of an individual to produce digital biometric data;
• and
• b) encoding the digital biometric data using secret information to transmit encoded data to the biometric verifier, and
• at the biometric verifier,
• c) decoding the encoded data using the secret information to reproduce digital biometric data;
• d) verifying identity of the individual based on the digital biometric data.

In a system comprising:

• a biometric data input device;
• and a biometric verifier connected to the biometric data input device, a method for verifying identity of an individual, comprising the steps of:
• at the biometric data input device,
• a) inputting as biometric data a physical characteristic of an individual to produce digital biometric data;
• and
• b) encrypting the digital biometric data using an encryption key to transmit encrypted data to the biometric verifier, wherein the encryption key identifies the biometric data input device, and
• at the biometric verifier,
• c) storing an encryption key corresponding to each of said at least one biometric data input device;
• d) decrypting the encrypted data using the encryption key corresponding to the biometric data input device to reproduce digital biometric data;
• e) comparing a feature of the digital biometric data against previously registered biometric features to produce a comparison result;
• and
• f) determining whether the individual is an authorized person, based on the comparison result and correctness of decrypted digital biometric data.

In a system comprising:

• a biometric data input device;
• and a biometric verifier connected to the biometric data input device, a method for verifying identity of an individual, comprising the steps of:
• at the biometric data input device,
• inputting as biometric data a physical characteristic of an individual to produce digital biometric data;
• embedding secret information as a watermark in the digital biometric data to produce watermarked biometric data;
• encrypting the watermarked biometric data to produce encrypted data;
• and
• transmitting the encrypted data and a device identification identifying the biometric data input device to the biometric verifier;
• at the biometric verifier,
• storing secret information corresponding to a device identification for each of said at least one biometric data input device;
• decrypting the encrypted data to produce watermarked digital biometric data;
• separating digital biometric data and watermark data from decrypted watermarked digital biometric data;
• comparing a feature of the digital biometric data against previously registered biometric features to produce a feature comparison result;
• comparing the separated watermark data with secret information corresponding to the device identification identifying the biometric data input device to produce a secret information comparison result;
• and
• determining whether the individual is an authorized person, based on the feature comparison result and the secret information comparison result.

In a system comprising:

• a biometric data input device;
• and a biometric verifier connected to the biometric data input device, a method for verifying identity of an individual, comprising the steps of:
• at the biometric data input device,
• inputting as biometric data a physical characteristic of an individual to produce digital biometric data;
• embedding secret information as a watermark in the digital biometric data to produce watermarked biometric data;
• encrypting the watermarked biometric data to produce encrypted biometric data;
• encrypting the secret information using a public key of asymmetric encryption scheme to produce encrypted secret information;
• and
• transmitting the encrypted biometric data and the encrypted secret information, and
• at the biometric verifier,
• decrypting the encrypted biometric data to produce watermarked digital biometric data;
• decrypting the encrypted secret information to produce received secret information;
• separating digital biometric data and watermark data from the decrypted watermarked digital biometric data;
• comparing a feature of the digital biometric data against previously registered biometric features to produce a feature comparison result;
• comparing the separated watermark data with the received secret information to produce a secret information comparison result;
• and
• determining whether the individual is an authorized person, based on the feature comparison result and the secret information comparison result.