Abstract: Disclosed is a method of performing, by a first device, short-range wireless communication with a second device, the method including receiving, from the second device, second authentication information encrypted using first authentication information of the first device, decrypting the encrypted second authentication information by using the first authentication information, determining a secret key based on the decrypted second authentication information, and performing communication between the first device and the second device by using the determined secret key.

Abstract: A method performed by a first device to establish a connection to a second device includes: obtaining identification information of the second device by using a first communication method; obtaining the identification information of the second device by using a second communication method; obtaining first distance information regarding the second device based on characteristics of the first communication method and the second communication method; and determining whether to transmit a connection request to the second device based on the obtained first distance information.

Abstract: The present disclosure relates to technologies for a sensor network, machine-to-machine (M2M) communication, machine type communication (MTC), and an Internet of Things (IoT) network. The present disclosure may be used in intelligence services based on such technologies (smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail business, and security and safety-related services). Provided is a method of transmitting encrypted data for preventing identification of transmitting and receiving devices, from a first device to a second device, the method including: generating an encryption key for encrypting data; generating key identification information by using the generated encryption key and encrypting the data; and transmitting a data set including the encrypted data and the key identification information to the second device.

Abstract: Provided is a method, performed by a first device, of sharing a key, the method including: determining a communication method for exchanging a key between the first device and a second device, based on pre-set channel ranking information; receiving a key of the second device from the second device by using the determined communication method; and authenticating the received key of the second device.

Abstract: Disclosed is a method of performing, by a first device, short-range wireless communication with a second device, the method including receiving, from the second device, second authentication information encrypted using first authentication information of the first device, decrypting the encrypted second authentication information by using the first authentication information, determining a secret key based on the decrypted second authentication information, and performing communication between the first device and the second device by using the determined secret key.

Abstract: A method performed by a first device to establish a connection to a second device includes: obtaining identification information of the second device by using a first communication method; obtaining the identification information of the second device by using a second communication method; obtaining first distance information regarding the second device based on characteristics of the first communication method and the second communication method; and determining whether to transmit a connection request to the second device based on the obtained first distance information.

Abstract: 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.

Abstract: The present disclosure relates to technologies for a sensor network, machine-to-machine (M2M) communication, machine type communication (MTC), and an Internet of Things (IoT) network. The present disclosure may be used in intelligence services based on such technologies (smart homes, smart buildings, smart cities, smart cars or connected cars, healthcare, digital education, retail business, and security and safety-related services). Provided is a method of transmitting encrypted data for preventing identification of transmitting and receiving devices, from a first device to a second device, the method including: generating an encryption key for encrypting data; generating key identification information by using the generated encryption key and encrypting the data; and transmitting a data set including the encrypted data and the key identification information to the second device.

Abstract: Provided is a method, performed by a first device, of sharing a key, the method including: determining a communication method for exchanging a key between the first device and a second device, based on pre-set channel ranking information; receiving a key of the second device from the second device by using the determined communication method; and authenticating the received key of the second device.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: Provided are a method of connecting BLUETOOTH® devices using a single BLUETOOTH® channel and a BLUETOOTH® device using the method. A public key may be exchanged via a predefined single BLUETOOTH® 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® devices, other BLUETOOTH® devices may also receive the public key via the single BLUETOOTH® channel. Accordingly, the other BLUETOOTH® devices may recognize that the MITM attacker attempts to carry out the MITM attack using a disguised address.

Abstract: 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.

Abstract: 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.

Abstract: A method and system for protecting a broadcast frame are provided. A frame broadcasted through a packet switching network is protected and a wireless LAN system is included. A current frame is authenticated based on a TESLA scheme. The authentication of the broadcast frame can be performed without a time difference.