Digital watermarking apparatus, digital watermark extraction apparatus, digital watermarking method, digital watermark extraction method and program
AssigneeNippon Telegraph and Telephone Corporation
InventorFuyuki KITAGAWA
Life of this patent
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Abstract
An electronic watermark embedding apparatus according to an embodiment is an electronic watermark embedding apparatus capable of embedding an electronic watermark into a decoding circuit of secret-key encryption, and includes an embedding unit configured to generate the decoding circuit. The decoding circuit is embedded with the electronic watermark by being input with a common parameter generated in a setup of the secret-key encryption, a secret key of the secret-key encryption, and the electronic watermark, and is capable of decoding an encrypted text encrypted using the secret-key encryption.
Claims17
An electronic watermark embedding apparatus capable of embedding an electronic watermark into a decoding circuit of secret-key encryption, the apparatus comprising a processor configured to execute a method comprising:
- receiving input including a common parameter generated in a setup of the secret-key encryption, a secret key of the secret-key encryption, and the electronic watermark;
- and
- generating, based on the input, the decoding circuit embedded with the electronic watermark, the decoding circuit being capable of decoding an encrypted text encrypted using the secret-key encryption.
An electronic watermark extraction apparatus capable of extracting an electronic watermark embedded in a decoding circuit of secret-key encryption, comprising a processor configured to execute a method comprising:
- receiving input including a combination of a common parameter generated by a setup of the secret-key encryption and the decoding circuit:
- and
- extracting, based on the input, the electronic watermark embedded in the decoding circuit, the decoding circuit being capable of decoding an encrypted text encrypted using the secret-key encryption.
A computer implemented method, comprising:
- receiving input including a common parameter generated in a setup of secret-key encryption, a secret key of the secret-key encryption, and an electronic watermark;
- and
- generating, based on the input, a decoding circuit embedded with an electronic watermark the decoding circuit being capable of decoding an encrypted text encrypted using the secret-key encryption.
7-8. (canceled)
Dependencies are inferred from the claim text.