Samsung Electronics Co., Ltd.

Mi Suk Huh

Dae Youb Kim

Hwan Mook Kim

Tae-Chul Jung

Sung Min Kim

Chee Sun Won

Kyung Hun Jang

Byoung Joon Lee

Jong Bu Lim

Hwan Joon Kim

Jae Hoon Kim

Myeong Wuk Jang

Eun Ah Kim

Ki Ho Kim

Byoung-Joon Lee

Won Hyung Lee

Kil Sang Yoo

A method of secure communication in a transmitter, includes determining a method of generating a training sequence that is shared with a receiver. The method further includes generating the training sequence based on the method of generating the training sequence, and secret information. The method further includes communicating with the receiver based on channel information derived from the training sequence.

Method and apparatus for secure communication and determining secret information

A content protection method includes generating content protection information regarding a content to be protected by a content producer, and generating a content name indicating a location of the content in content name based networks based on the content protection information. The content protection information may include at least one of marking information indicating whether the content is protected and policy information indicating a disclosure range of the content.

Network apparatus based on content name and method for protecting content

Provided is a method of generating a user-oriented virtual private community without the need for a server. The method includes generating a first virtual private community for a predetermined user including at least one communication device of the predetermined user.

Method of generating a virtual private community and network using the virtual private community

An apparatus and method for video watermarking are provided. The apparatus and method include receiving a bit stream encoded by a video encoder by a spatial domain information analyzer and extracting information from a spatial domain of an image with respect to code words forming the bit stream, grouping the code words for each segmented domain by a domain classifier based on the information from the spatial domain, determining a sign of the each segmented domain by a domain sign determiner and inserting a watermark in the each segmented domain according to the sign determined by the domain sign determiner by a watermark bit inserter.

Method and apparatus for inserting video watermark in compression domain

A method of transmitting secret information in a transmitting end and a method of receiving secret information at a receiving end, based on multi-input multi-output (MIMO) multiplexing using antennas, are provided. The method of transmitting includes selecting one or more indices of the secret information that correspond to at least one receiving antenna among receiving antennas, and mapping the one or more indices to an information vector. The method of transmitting further includes precoding the information vector based on channel information between transmitting antennas and the receiving antennas, and beamforming the precoded information vector, using the transmitting antennas.

Method of transmitting secret information at transmitting end and method of receiving secret information at receiving end, based on MIMO multiplexing using antennas

A method of generating and authenticating a content name in content-centric networking (CCN) and a network apparatus are provided. A content name generation method includes generating authentication information using a secret key shared by network apparatuses that belong to a domain in content-centric networking (CCN); and generating a content name that includes the authentication information.

Network apparatus based on content name, method of generating and authenticating content name

Provided are a method of connecting BLUETOOTH&#xae; devices using a single BLUETOOTH&#xae; channel and a BLUETOOTH&#xae; device using the method. A public key may be exchanged via a predefined single BLUETOOTH&#xae; channel, thereby preventing a Man-in-the-middle (MITM) attack. For example, when an MITM attacker intercepts the public key and attempts to perform an attack on the other BLUETOOTH&#xae; devices, other BLUETOOTH&#xae; devices may also receive the public key via the single BLUETOOTH&#xae; channel. Accordingly, the other BLUETOOTH&#xae; devices may recognize that the MITM attacker attempts to carry out the MITM attack using a disguised address.

Bluetooth&#xae; device and method of connecting Bluetooth&#xae; devices using a Bluetooth&#xae; channel

The present invention relates to a system and method for restricting recording of contents using a device key of a content reproduction device. A content recording device includes a content recording unit for encrypting contents using a Content Encryption Key (CEK) and recording the encrypted contents in a recording medium; a CEK transmitting/receiving unit for transmitting the CEK to at least one content reproduction device, and receiving, from the at least one content reproduction device, an encrypted CEK being encrypted using a device key of each of the at least one content reproduction device; and a CEK recording unit for recording the encrypted CEK in the recording medium.

System and method of restricting recording of contents using device key of content playback device

A rekey index generation method and a rekey index generation apparatus are provided. The rekey index generation method includes inserting join information to a first field of a rekey index when new members join a group; and inserting node numbers, corresponding to each of the new members, into a second field of the rekey index for a receiver to select a necessary key from among transmitted encoded keys.

Rekey index generation method and rekey index generation apparatus

A method and device for updating a group key are disclosed. The group key updating method comprises determining a start node for a key update on a binary tree, updating a node key of the start node for a key update, updating a node key of a parent node of a node corresponding to the updated node key using the updated node key, and repeatedly performing the updating of the node key of the parent node, and then updating a node key corresponding to a root node of the binary tree. With the disclosed method and device, it is possible to efficiently perform a group key update process.

Method of and device for updating group key

A method and apparatus for updating a group key of a group corresponding to a binary tree are provided. The method includes updating keys of leaf nodes that correspond to new members, in response to a join of at least two new members joining the group; determining whether both of two child nodes of a single ancestor node are updated when updating a key of the single ancestor node of the leaf nodes; establishing one of the two child nodes as an update use node when both the two child nodes are updated; and updating a key of the ancestor node using the updating node. Thus, the group key may be effectively updated with respect to multi-join.

Method and apparatus for updating a group key

A group key update method and a group key update apparatus for updating a key of members in a group are provided. The group key update method includes selecting a sub-root node among nodes on the binary tree; performing a node change with respect to the group according to a type of the sub-root node, and generating a changed binary tree; and performing a node key update with respect to the changed binary tree.

Method of updating group key and group key update device using the same

Provided are a method of generating a node identifier including padding information and location information, in a tree structure, a computer-readable storage medium storing a program for executing a method of generating a node identifier in a tree structure, and a terminal apparatus using the tree structure. The location information is generated by using branch identifiers, each of the branch identifiers being allocated for each branch from a root node to a target node. The padding information is generated by a padding code, which includes information about a group of the target node, and depth information, which includes information about a level of the target node in the tree structure.

Method of generating node indentifier in tree structure

A video watermarking apparatus and method are provided, including an information provider for providing spatial domain segmentation information of an image with respect to a compressed video, a grouping unit for grouping the compressed video, based on the spatial domain segmentation information, and generating a grouped spatial domain, an extraction domain selector for selecting an extraction domain for extracting a watermark from the grouped spatial domain, and a watermark extractor for extracting a watermark bit inserted in the extraction domain.

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Suwon-si, South Korea

Mi Suk Huh