Samsung Electronics Co., Ltd.

Yong-kuk You

Sung-hyu Han

Yang-lim Choi

Bong-seon Kim

Choong-Hoon Lee

Yun-sang Kim

Hee-chul Han

So-young Lee

Ji-Young Moon

Young-sun Yoon

Seong-Soo Kim

Jun Yao

Chang-Yeul Kwon

Myung-Sun Kim

Jun-bum Shin

Jae-heung Lee

Chang-sup Ahn

Chi-hurn Kim

Jung-wan Ko

Hyun-kwon Chung

Yun-ho Choi

Su-hyun Nam

Myung-sun Kim

Sang-su Choi

Yong-jin Jang

Moon-young Choi

Dave Ahn

Jong-ho Rhee

Yao Jun

Hee-jae Park

Hoc-chul Han

Yung-Sang Kim

Yang-Lim Choi

Hee-Chul Han

Provided are a method and apparatus for effectively fixing scrambled content. The method includes checking fixing information for a program map table (PMT) packet of packets constituting the content, the fixing information being used to fix a transformed part of the content; extracting location information of a next PMT packet containing fixing data for fixing the transformed part of the content from the fixing information of the PMT packet; and fixing the transformed part of the content by using the fixing data in the next PMT packet indicated by the extracted location information. Accordingly, it is possible to easily detect a location of the content, which stores the fixing information, thereby expediting fixing of the transformed content.

Method and apparatus for efficiently fixing transformed part of content

A method of and apparatus for installing software for using digital content and are provided. The method of installing software for using digital content includes: transmitting a request for the software; transmitting security information indicating a security status of a device in which the software is to be installed; and receiving the software from an external apparatus that received the request and security information. According to the method and apparatus, the software can be dynamically securely installed, thereby allowing a variety of digital contents to be used and enhancing the utilization of the device.

Method of installing software for using digital content and apparatus for playing digital content

The method of decrypting a ciphertext includes: pre-storing a plurality of polynomial functions into which a secret key decrypting a ciphertext to a plaintext according to a public-key cryptography algorithm is broken down; receiving the ciphertext generated based on the secret key which is broken down into the plurality of polynomial functions from a ciphertext generating device; and decrypting the received ciphertext into the plaintext based on the pre-stored polynomial functions.

Decryption apparatus and method of decrypting ciphertext of the same

A method of checking revocation of a device and software, and transmitting data to a secure device and secure software whose keys have not been leaked is provided. The method includes receiving authentication information of a device requesting transmission of data, and authentication information of software accessing the data in the device; checking revocation of the device and the software, based on the received authentication information; and transmitting the data to the software of the device, when the device and the software are not revoked as a result of the checking. By doing so, during transmission of data, such as content or a license, it is possible to check security of a device and software being executed in the device, so that the data can be more safely transmitted.

Method, system, and data server for checking revocation of content device and transmitting data

A method and apparatus for generating and updating a license for content and for providing content are provided. The method of generating a license includes generating license signature information for authenticating the license; generating use rule information for controlling the use of the content; generating authentication code information for authenticating a coupon for changing at least a portion of the use rule information; and generating key information required for decrypting the content.

Method of generating license, and method and apparatus for providing contents using the same

Provided is a method of preventing digital content from being used despite the presence of copy control information. In the method, a security apparatus capable of restricting use of contents generates a nonce with respect to a storage device and stores the nonce in the storage device and a memory separated from the storage device when content is stored in the storage device; updates the nonces stored in the memory and storage device when movement of the content occurs; and permits use of the content only when the nonce of the storage device, which is stored in the memory, is equal to the nonce stored in the storage device if the content is requested for use, thereby preventing a disk cloning attack.

Method and apparatus for forbidding use of digital content against copy control information

A method for transmitting content to a user device from a home server in a home network is provided. The method includes: receiving an allocated user public key and a user private key of a user to whom the home server belongs; generating an arbitrary session public key and a session private key, generating an encrypted session private key by encrypting the session private key using a device public key that is a public key of the user device, and transmitting the encrypted session private key to the user device; and transmitting the content encrypted using a predetermined content key and a content key encrypted using the session private key to the user device. According to the method, by binding the content to each user, instead of to each device, the content can be safely and conveniently shared.

Method for transmitting content in home network using user-binding

Provided is a method of inserting authentication code into a data packet. The method includes determining whether to insert authentication code into a data packet based on at least one of an importance of the data packet and a type of the data packet, and inserting the authentication code into the data packet based on a result of the determining.

Method and apparatus for inserting authentication code, and method and apparatus for using data through authentication

A method of encrypting data is provided. The method includes dividing data in packet units into N data blocks; generating an initial counter value using a random number used for generating an encryption key for encrypting the data blocks; generating N counter values by increasing the initial value by a predetermined value N times and encrypting the N counter values using the encryption key; and performing an exclusive OR operation on the N encrypted counter values and the N data blocks.

Method and apparatus for encrypting data

A method of protecting important data in digital content and an apparatus therefor are provided. The method includes: receiving digital content which includes first important data; receiving reference data which includes second important data and authentication data for verifying whether the first important data is modified; and selectively correcting the first important data included in the digital content based on the reference data.

Method for protecting important data of contents and apparatus therefor

A method and apparatus of transmitting data using authentication between a first device and a second device are provided. The method includes transmitting an encrypted certificate of the first device using a shared key shared by the first device and the second device, receiving authentication key generation information for generating an authentication key, which is received when it is determined that the certificate of the first device is valid and not revoked, generating a first random number and generating an authentication key based on the first random number and the authentication key generation information, and encrypting and transmitting data using the authentication key.

Method and apparatus for transmitting data using authentication

Disclosed are a method of multi-streaming encrypted contents stored in a storage medium to a second player during streaming the contents to a first player, and an apparatus using the same. The method includes: temporarily storing the encrypted contents streaming to the first player in a temporary storage medium; and streaming the stored contents to the second player in response to a multi-streaming command input by a user to the second player, wherein key generation information required to decrypt the encrypted contents is not stored in the temporary storage medium. It is possible to provide a multi-streaming with a copy protection through temporary storage, and also to reduce noise caused by rotation of the disc in the streaming apparatus.

Multi-streaming apparatus and multi-streaming method using temporary storage medium

A method of managing and restoring an identifier of a storage device and an apparatus therefor are provided. The method includes the operations of generating a storage device identifier; recording the storage device identifier in a non-volatile memory of a host; generating an identifier file including the storage device identifier and a host identifier; and recording the identifier file in the storage device. By doing so, the method and apparatus can efficiently and securely manage the storage device.

Method of managing and restoring identifier of storage device and apparatus therefor

A method of creating a domain based on public key cryptography includes providing, by a content-providing server, a list of devices requesting content, and selecting, by a user, a device from the list; transmitting, by the server, discrimination information on revoked devices to the device; extracting, by the device having received the discrimination information, a secret value from the discrimination information, preparing a certificate using the extracted secret value, and transmitting device information and the certificate of the device to the server; verifying, by the server, the certificate and creating a domain ID and a domain key using the device information; encrypting, by the server, the domain ID and the domain key using a unique public key of the device and transmitting the encrypted domain ID and domain key to the device; and restoring, by the device, the domain key using a unique secret key of the device.

Method of creating domain based on public key cryptography

Provided is a method of key agreement between devices. Using the method, two devices on a network can exchange information using polynomials of a polynomial ring, authenticate each other using the exchanged information, and generate a shared key. Accordingly, an authenticated key agreement protocol, which has better security and a faster processing speed than a conventional encoding system, can be realized.

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Seoul, South Korea

Yong-kuk You