Electronics and Telecommunications Research Institute

Hyunsook Cho

Doo Ho Choi

Kyo Il Chung

Sang-Woo Lee

Byung Ho Chung

You Sung Kang

Sin Hyo Kim

Dowon Hong

Hae Dong Lee

Namsu Jho

Kuyoung Chang

A server provides the user's desired data without the server knowing the contents or keywords of data by using a method of searching the desired data without decrypting the encrypted data, such that the privacy for the important data of the user can be secured. Also, the present invention shortens the operation time when searching the encrypted data, such that it can prevent the degradation in efficiency due to excess operation involved in the previous existing methods based on the pairing operation.

Method for data encryption and method for conjunctive keyword search of encrypted data

A license managing device sets a security area for storing a license file, maintains the security area as an encoded file in an inactive state of the security area by encoding the security area, maintains the security area as a directory in an active state of the security area by decoding the security area, and encodes a license file by using a file encoding key according to the user's request and stores the same in a security area in an active state of the security area.

License managing method and device

An apparatus for generating a secret key generates the secret key by using information of a mobile RFID terminal, transmits the generated secret key to an RFID tag attached on an article, and decrypts a unique item identifier of the article encrypted by using the generated secret key after receiving the unique item identifier of the article encrypted by using the secret key from the RFID tag. By this configuration, it is possible to protect user's personal privacy of the mobile RFID terminal in a state where user's intervention is minimized.

Apparatus and method for generating secret key

Provided is an RFID tag. When no external pressure is applied to a packaging structure, a wire for transmitting power and data from an antenna is separated from an RFID chip by an air layer. When external pressure is applied to the packaging structure, the wire is connected to the RFID chip to transmit the power and data between the antenna and the RFID chip.

Pressure activated passive RFID tag

Growing community of inventors

Daejeon, South Korea

Hyunsook Cho