Lg Electronics Inc.

Min Gyu Chung

Sung Hyun Cho

Il Gon Park

Koo Yong Pak

Kumar K Kiran

Soo Jung Kim

Man Soo Jeong

Koo-yong Pak

A method for using contents, a method for sharing contents, and a device based on security level are disclosed. A method for using contents based on security level creates a device security level according to the number of device identification elements, receives contents, and if the device security level is found to be a minimum allowed device security level for using the contents, uses the contents. Therefore, a device that does not satisfy the conditions required for using contents cannot use the contents, whereby security is reinforced.

Method for protecting contents, method for sharing contents and device based on security level

A secure signing method, a secure authentication method, and an IPTV system are disclosed. The secure signing method includes preparing digital signature header fields and setting an attribute, calculating a hash digest of content using a hashing algorithm, storing the calculated hash value in a message digest field of the digital signature header, encrypting the message digest using a secret key and inserting the encrypted message digest in a signature field of the digital signature header, and associating the digital signature header with the content by prefixing the digital signature header to the content. The secure authentication method includes checking whether a format and value of a digital signature header of content are appropriate, calculating a hash digest of the content using a hashing algorithm, comparing the calculated hash value with a message digest field of the digital signature header, decrypting the hash value of the signature field of the digital signature header using a public key extracted from a certificate field, and comparing the decrypted hash value with the message digest.

Secure signing method, secure authentication method and IPTV system

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.

Method and system for secure communication

A method and system for processing content are provided. The method of processing content includes: receiving source data from a first system; interoperable-processing the source data and generating a target data; and transmitting the target data to a second system, the first system or the second system include at least one of access control system, copy protection system and use control system. Accordingly, it is possible to easily process non-compliant content in the DRM interoperable system.

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Seoul, South Korea

Min Gyu Chung