摘要:
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.
摘要:
Provided are a system and a method for transmitting and receiving contents at home. The content service method includes: reconstructing encrypted compressed contents back into compressed contents by decrypting the encrypted compressed contents according to a first scheme; encrypting the reconstructed compressed contents according to a second scheme; and transmitting the encrypted compressed contents via a predetermined link. Therefore, the encrypting and decrypting of contents are easily supported without an encoding process in a content server terminal at home.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
An apparatus and method for securely storing data. The apparatus for securely storing data in a predetermined device, includes: a key generator generating a protection key used to encrypt data based on a random number generated by inputting predetermined secret information in a predetermined random number generation function, and generation sequence information, which is information on a generation sequence of the random number, wherein the predetermined secret information is stored in a secure region, and the random number generation function can generate the protection key based on the generation sequence information and the secret information. As described above, the apparatus and method for storing data make it possible to securely store data even if the apparatus for storing data is replaced.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.