Abstract:
The present invention relates to a homomorphic encryption which provides an operation function for original data only using public information such as encryption data and a public key without receiving corresponding private information for encrypted data so as to decrypt a plaintext only with the private information of a specific user. A compressed encryption and decryption providing system according to the present invention includes: a key generation module for receiving a predetermined stability reference value and compression ratio value and generating a public key and a private key to encrypt and decrypt plaintext information; an encryption module for compressing and encrypting the plaintext information using the generated public key; and a decryption module for decrypting the encrypted compressed ciphertext.
Abstract:
본 발명은 부분 연결성을 제공하는 익명 서비스 방법에 관한 것으로, 서비스단말이 익명인증서버와 상호 협력하여 서비스 이용자의 그룹서명 비밀키를 획득하는 서비스 이용자 가입 과정; 서비스제공서버가 익명ID확인서버와 상호 협력하여 서비스제공자의 부분 연결용 공개키(LL 공개키) 및 비밀키(LL 비밀키) 쌍을 획득하는 서비스제공서버 가입 과정; 상기 서비스단말이 상기 서비스제공서버로부터 상기 LL 공개키를 제공받고, 그룹 공개키와 상기 LL 공개키, 상기 그룹서명 비밀키를 기반으로 하여 상기 서비스 이용자의 그룹서명을 생성하는 그룹서명 생성과정; 상기 서비스 제공서버가 상기 그룹 공개키와 상기 LL 공개키를 이용하여 상기 그룹서명의 유효 여부를 검증하는 그룹서명 검증과정; 상기 익명ID확인서버가 상기 그룹서명으로부터 익명ID를 계산한 후, 상기 익명인증서버와 상호 협력하여 상기 익명ID를 가지는 서비스 이용자를 확인하는 서명자 확인 과정; 및 상기 서비스제공서버가 상기 LL 비밀키를 통해 상기 그룹서명으로부터 상기 서비스 이용자의 가상인덱스를 획득하여, 상기 서비스 이용자의 부분 연결성을 확보하는 부분 연결 과정을 포함할 수 있다.
Abstract:
PURPOSE: A generation device of a dynamic multidimensional code combining time information and visual recognition information, a recognition device and a method thereof are provided to display moving pictures or a dynamic advertisement including an image of original information in the dynamic multidimensional code, thereby easily grasping intended contents of the original information. CONSTITUTION: A preprocessing unit(100) receives original information and visual recognition information for generating a multidimensional code. A multidimensional code generation unit(102) encodes a dynamic multidimensional code by combining the original information and the visual recognition information corresponding to time. The visual recognition information is connected to the original information. The visual recognition information is changed corresponding to the time and is dynamic image information capable of recognition. [Reference numerals] (100) Preprocessing unit; (102) Multidimensional code generation unit; (104) Multidimensional code display unit; (120) Multidimensional code recognition unit; (122) Decoding unit
Abstract:
PURPOSE: A RAID(Redundant Array of Inexpensive Disks) control device for RAID level 5 acceleration using a parity cache and a method thereof are provided to increase a data transmitting speed and input/output numbers per second. CONSTITUTION: A parity cache memory(122) includes a binary cell and parity cells. The binary cell stores previous parity information. The parity cells include XOR gate. If the parity information is inputted, the XOR gate performs XOR on newly inputted parity information and previous parity information stored in the binary cell and stores the result in the binary cell. A parity cache controller(121) controls the parity cache memory.
Abstract:
PURPOSE: A video watermark insertion device, system and method for evaluating a watermarking algorithm using the same are provided to quantitively measure toughness performance of an watermark algorithm. CONSTITUTION: A watermark inserting unit(110) inserts a watermark including user information into a video content. According to deformation kind and intensity of video, a video transforming unit(120) performs video deformation about the content. A watermark detecting unit(130) detects watermark from a watermarked content. The water mark detecting unit outputs roughness information of a watermarking algorithm.