METHOD OF AUTHENTICATING AND REPRODUCING CONTENT USING PUBLIC BROADCAST ENCRYPTION AND APPARATUS THEREFOR
First Claim
1. A method of authenticating a first device and a second device using public broadcast encryption, the method comprising:
- acquiring specific information of the second device from the second device;
transmitting data, containing the acquired specific information of the second device and specific information of the first device, by encrypting the data using a broadcast public key of a group to which the second device belongs; and
determining whether authenticating the first device succeeds by decrypting the encrypted data using a private key of the second device;
wherein, if the authenticating of the first device succeeds;
receiving the specific information of the first device, which is encrypted by a temporary common key generated using the decrypted data; and
authenticating the second device by decrypting the encrypted specific information of the first device using the temporary common key.
1 Assignment
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Accused Products
Abstract
Provided are a method and apparatus for mutually authenticating devices in a group and reproducing content using public broadcast encryption. The method of authenticating a first device and a second device includes acquiring specific information of the second device from the second device, transmitting data, containing the acquired specific information of the second device and specific information of the first device, by encrypting the data using a broadcast public key of a group to which the second device belongs, and determining whether authentication of the first device succeeds by decrypting the encrypted data by using a private key of the second device. If authentication succeeds, receiving the specific information of the first device, which is encrypted by using a temporary common key by using the decrypted data, and authenticating the second device by decrypting the encrypted specific information of the first device by using the temporary common key.
26 Citations
25 Claims
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1. A method of authenticating a first device and a second device using public broadcast encryption, the method comprising:
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acquiring specific information of the second device from the second device; transmitting data, containing the acquired specific information of the second device and specific information of the first device, by encrypting the data using a broadcast public key of a group to which the second device belongs; and determining whether authenticating the first device succeeds by decrypting the encrypted data using a private key of the second device; wherein, if the authenticating of the first device succeeds; receiving the specific information of the first device, which is encrypted by a temporary common key generated using the decrypted data; and authenticating the second device by decrypting the encrypted specific information of the first device using the temporary common key. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of reproducing content using public broadcast encryption, wherein a first device receives the content from a second device, the method comprising:
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acquiring specific information of the second device from the second device, which comprises content, encrypted by a content encryption key, and the content encryption key, encrypted by a broadcast public key of a group to which the first device belongs; transmitting first data, which contains the acquired specific information of the second device and specific information of the first device, by encrypting the first data by a broadcast public key of a group to which the second device belongs; and determining whether authenticating the first device succeeds by decrypting the first data by a private key of the second device;
wherein, if the authenticating of the first device succeeds;receiving second data, which contains the specific information of the first device, re-encrypted by a temporary common key generated using the decrypted first data, and the encrypted content encryption key, and receiving the encrypted content; authenticating the second device by decrypting the second data by the temporary common key; and determining whether authenticating of the second device succeeds; and wherein, if the authenticating of the second device succeeds; re-decrypting the encrypted content encryption key included in the decrypted second data, by a private key of the first device; and decrypting the encrypted content using the decrypted content encryption key. - View Dependent Claims (9, 10, 11, 12, 13, 25)
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14. An apparatus for authenticating a first device and a second device using public broadcast encryption, the apparatus comprising:
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a receiver which acquires specific information of the second device from the second device; an encryption unit which encrypts data, containing the acquired specific information of the second device and specific information of the first device, by using a broadcast public key of a group to which the second device belongs; and a transmitter which transmits the encrypted data, wherein if authenticating of the first device succeeds by decrypting the encrypted data by a private key of the second device, the receiver receives the specific information of the first device encrypted by a temporary common key, wherein the apparatus further comprises; a decryption unit which decrypts the encrypted specific information of the first device by using the temporary common key generated using the data; and an authenticator which authenticates the second device based on the decrypted specific information of the first device. - View Dependent Claims (15, 16, 17, 18, 19)
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20. An apparatus for reproducing content using public broadcast encryption, wherein a first device receives the content from a second device, the apparatus comprising:
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a receiver which acquires specific information of the second device from the second device, which comprises content, encrypted by a content encryption key, and the content encryption key, encrypted by a broadcast public key of a group to which the first device belongs; an encryption unit which encrypts first data, containing the acquired specific information of the second device and specific information of the first device, by using a broadcast public key of a group to which the second device belongs; and a transmitter which transmits the encrypted first data; wherein if the authenticating of the first device succeeds by decrypting the encrypted first data by a private key of the second device, the receiver receives second data, which contains the specific information of the first device, re-encrypted by a temporary common key generated using the decrypted first data, and the encrypted content encryption key, and the encrypted content, wherein the apparatus further comprises; a first decryption unit which decrypts the received second data by using the temporary common key; and an authenticator which authenticates the second device based on the decrypted specific information of the first device. wherein the first decryption unit comprises; a second decryption unit which re-decrypts the encrypted content encryption key included in the decrypted second data by using a private key of the first device, if authenticating of the second device succeeds; and a third decryption unit which decrypts the encrypted content by using the decrypted content encryption key. - View Dependent Claims (21, 22, 23, 24)
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Specification