Abstract: Disclosed are a system and method for key exchange based on user authentication information. The system for key exchange based on user authentication information includes a client configured to generate ciphertext corresponding to authentication information of a user of the client using a random number for the client and server identification information, and a server configured to decrypt the ciphertext received from the client using a private key for the server corresponding to the server identification information to restore the authentication information, authenticate the client using the restored authentication information, and generate a session key for the server corresponding to the authenticated client.

Abstract: A plankton examination apparatus comprises: a sub-pipe in which a transparent pipe unit; a light source unit which radiates only blue-series light; a detection unit which receives light radiated in the direction on the other side outside the transparent pipe unit through the transparent pipe unit from the light source unit and generates an image of the plankton; and a dichroic mirror installed between the transparent pipe unit and the detection unit in such a way as to transmit only red-series light which belongs to the light radiated by the light source unit and passed through the transparent pipe unit and has a wavelength of 620 nm to 780 nm and to deliver the red-series light to the detection unit.

Abstract: A method for determining a number of individuals of microorganisms included in a sample using an optical apparatus, comprising steps of: collecting, by the image acquisition unit, light radiated by microorganisms which radiate only light of a specific wavelength range and are included in the sample; generating, by the image acquisition unit, an image of the collected image; displaying, by the image processing unit, the image generated by the image acquisition unit on a screen, analyzing each of pixels forming the screen on which the image has been displayed, and classifying a plurality of pixels which belongs to the pixels included in the screen and continuously emit light to be a single object; and calculating, by the image processing unit, a total number of objects classified in the screen.

Abstract: An imaging system on an aerial vehicle, includes: a group of rotating camera including at least a first and a second rotating cameras on the aerial vehicle; and a control part which controls a first virtual rotation track of the first rotating camera and a second virtual rotation track of the second rotating camera and allows shots to be taken at multiple photograph-shooting points on the first virtual rotation track and the second virtual rotation track; wherein the control part controls a set of multiple photograph-shooting points on the first virtual rotation track and those on the second virtual rotation track to be substantially in a grid shape. Accordingly, a 3D image could be acquired by using the group of rotating cameras on the aerial vehicle during a relatively short endurance flight and more information on images created in such a method could be estimated.

Abstract: A method for estimating a position of a target by using an image acquired from a camera is provided. The method includes the steps of: (a) setting multiple virtual estimated reference points by dividing a view-path; (b) comparing altitude values of the respective estimated reference points with those of respective points on terrain; (c) searching neighboring virtual estimated reference points among the multiple virtual estimated reference points to satisfy a requirement under which a difference between an altitude zk of one point among the neighboring estimated reference points and that of the terrain corresponding thereto and a difference between an altitude zk+1 of the other point among the neighboring estimated reference points and that of the terrain corresponding thereto have different signs; and (d) determining that the actual position of the target exists between the searched estimated reference points Pk.

Abstract: A method for estimating a position of a target by using an image acquired from a camera is provided. The method includes the steps of: (a) setting multiple virtual estimated reference points by dividing a view-path; (b) comparing altitude values of the respective estimated reference points with those of respective points on terrain; (c) searching neighboring virtual estimated reference points among the multiple virtual estimated reference points to satisfy a requirement under which a difference between an altitude zk of one point among the neighboring estimated reference points and that of the terrain corresponding thereto and a difference between an altitude zk+1 of the other point among the neighboring estimated reference points and that of the terrain corresponding thereto have different signs; and (d) determining that the actual position of the target exists between the searched estimated reference points Pk.

Abstract: Provided is an apparatus for encrypting data including a key determiner configured to determine a cipher key for white-box cryptography (WBC)-based encryption and a symmetric key different from the cipher key and an encrypter configured to generate a ciphertext of the data using the WBC-based encryption and symmetric-key-based encryption with the symmetric key.

Abstract: Disclosed are a system and method for exchanging a key based on user authentication information. The system for exchanging a key based on user authentication information includes a terminal configured to generate an ID-based ciphertext corresponding to authentication information of a user of the terminal using a terminal-side random number and a server ID and a server configured to decrypt the ID-based ciphertext that is received from the terminal using a server-side private key corresponding to the server ID to restore the authentication information, authenticate the terminal using the restored authentication information, and generate a server-side session key corresponding to the authenticated terminal.

Abstract: An authentication method between a server and a client is provided. The authentication method includes transmitting, to the client, an inquiry message including a first modified secret key generated based on a first secret key and a first blinding value, receiving, from the client, a response message including a response value generated based on the first blinding value, a second secret key, and an error value, calculating the error value from the response value, and determining whether authentication of the client has succeeded based on the error value.

Abstract: A system and method for authenticating a resource-constrained client are provided. The method includes transmitting, by the server, a query message including a first modified secret key to the client, wherein the first modified secret key is generated using a first secret key and a first blinding value; receiving, from the client, a response message including a response value, wherein the response value is generated using the first blinding value, a second secret key, and an error value; calculating the error value from the response value; and determining, based on the error value, whether authentication of the client is successful.

Abstract: A congestion-resilient link adaptation method is provided. The link adaptation method for selecting any one of modes having mapped transmission parameters includes the steps of: estimating a channel-induced error number indicating the number of channel-induced transmission failures in a current mode and comparing the estimated channel-induced error number with a mode-down threshold; and determining whether the mode-down is performed based on the comparison result. Thus, higher throughput can be achieved without use of additional hardware or protocols.

Abstract: A congestion-resilient link adaptation method is provided. The link adaptation method for selecting any one of modes having mapped transmission parameters includes the steps of: estimating a channel-induced error number indicating the number of channel-induced transmission failures in a current mode and comparing the estimated channel-induced error number with a mode-down threshold; and determining whether the mode-down is performed based on the comparison result. Thus, higher throughput can be achieved without use of additional hardware or protocols.