Electronics and Telecommunications Research Institute

Chang Soon Park

Tae Geun Kim

Do Hyung Kim

Kyeong Deok Moon

Jun Hee Park

Yong-Seok Seo

Sanghyun Joo

Won Gyum Kim

Sung Woo Tak

An apparatus and method for preventing illegitimate distribution of digital contents on Internet obtains a first wavelet image having a user information-embedding region by performing a wavelet transformation (WT). The user information embedding region of the first wavelet image is wavelet-transformed to obtain a second wavelet image composed of a discrete cosine (DC) region and high-frequency regions second wavelet image. A high-frequency components removed image is obtained by removing high-frequency components in the high-frequency regions of the second wavelet image, and subjected to an inverse WT (IWT) to be outputted as an IWT image. A user information embedding unit embeds user information to the IWT image, wherein data of the user information are sequentially embedded to positions where a difference value between the user information embedding region and the new user information embedding region is small, to thereby reset the user information embedding region as the user information.

Apparatus and method for preventing illegal distribution of digital contents by using a fingerprinting technique

An independent checkpointing method using a memory checkpoint on a distributed system that includes a message transmission routine, a message processing routine, and a periodical checkpoint routine. The message transmission routine adds a self checkpoint number to a message to be transmitted when a current process tries to send a message to another process. The message processing routine performs a memory checkpoint and processes a message in reference to a checkpoint number of a transmission process, a checkpoint number of the current process, a memory checkpoint flag, and a message transmission flag when a message is received from a process. The periodical checkpoint routine performs a checkpoint that records a necessary state information for recovery against faults periodically in reference to the memory checkpoint flag.

Independent checkpointing method using a memory checkpoint on a distributed system

A direct memory access processing device of communication equipment which has a main memory device and communication equipment including queues storing information related to communications between processs and management tables storing physical addresses in the main memory device allotted to the process, and when information to be managed by a destination process is externally transferred to the communication equipment, retrieves information about the destination process stored in the queues from the management tables, thereby storing the received information in the addresses of the main memory device via a direct memory access, the main memory device comprising an area allotted to a process for the immediate use, and a daemon process wholly responsible for managing the area, and the management table comprising a process record for managing the address of the area allotted in the main memory device for the immediate use.

D.M.A. device that handles cache misses by managing an address of an

The present invention relates to a method for preparing safe electronic notarized documents in electronic commerce which provide a safe notarization for a transaction between a customer and a merchant. The method includes steps of a notarizing organization transmitting an electronic notarized document with a digital signature to a customer/merchant, the customer/merchant decoding the electronic notarized document and transmitting the electronic notarized document with digital signature to the notarizing organization, the notarizing organization decoding the electronic notarized document and comparing the decoded electronic notarized document with the electronic notarized document without any digital signatures so as to obtain a message digest of the notarized document and to send the electronic notarized document with digital signature to the customer/merchant, and the customer/merchant storing the electronic notarized document.

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Daejeon, South Korea

Chang Soon Park