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US 8,527,764 B2Granted
Method and system for secure communication
AssigneeLG Electronics Inc.
InventorsKumar K. Kiran, Sung Hyun Cho, Min Gyu Chung, Koo Yong Pak, Il Gon Park, Soo Jung Kim
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Abstract
A method and system for secure communication is provided. The method for secure communication with devices includes: obtaining a parameter for protecting a content; authenticating each other by exchanging a certificate with the device; and exchanging a key with the device using a key authenticated through the certificate to establish a secure authenticated channel with the device. Accordingly, it is possible to establish the secure authenticated channel and perform secure communication by computing a secure authenticated channel key.
Claims7
A secure communication method between devices, the method comprising:
- obtaining, by a first device from a second device, a parameter for protecting a content;
- performing, based on the obtained parameter, a mutual authentication with the second device which includes:
- transmitting a first authentication message including a certificate of the first device to the second device;
- receiving a second authentication message including a certificate of the second device and an on-line certificate status protocol server response indicating verification of the certificate of the second device, and
- verifying the certificate of the second device using the on-line certificate status protocol server response;
- authenticating the second device using the certificate of the second device;
- exchanging a key with the second device, the key authenticated through the certificate of the second device to establish a secure authenticated channel with the second device;
- and
- changing a content license protection mode corresponding to the content from a first content license protection mode to a second content license protection mode when the content is copied or moved from the second device;
- wherein the content license protection mode includes any one of:
- a secure authenticated channel protection mode which protects the license using a secure authenticated channel key during transfer of the license, an authorized domain secret protection mode which protects the license using an authorized domain secret protection, a secure authenticated channel/authorized domain protection mode which protects the license through the secure authenticated channel and authorized domain secret protection, and a device key protection mode which protects the license using a device key during storage of the license.
8 more elements
A secure communication system comprising:
- a first device;
- and
- a second device, which are interoperable with each other,
- wherein the first device is configured to:
- obtain from the second device a parameter for protecting a content,
- perform, based on the obtained parameter, a mutual authentication with the second device by:
- transmitting a first authentication message including a certificate of the first device to the second device,
- receiving a second authentication message including a certificate of the second device and an on-line certificate status protocol server response indicating verification of the certificate of the second device, and
- verify the certificate of the second device using the on-line certificate status protocol server response,
- authenticate the second device using the certificate of the second device,
- exchange a key with the second device, the key authenticated by the certificate of the second device to establish a secure authenticated channel between the first device and the second device, and
- change a content license protection mode corresponding to the content from a first content license protection mode to a second content license protection mode when the content is copied or moved between the first device and the second device,
- wherein the content license protection mode includes any one of:
- a secure authenticated channel protection mode which protects the license using a secure authenticated channel key during transfer of the license, an authorized domain secret protection mode which protects the license using an authorized domain secret protection, a secure authenticated channel/authorized domain protection mode which protects the license through the secure authenticated channel and authorized domain secret protection, and a device key protection mode which protects the license using a device key during storage of the license.
11 more elements
Dependencies are inferred from the claim text.