Abstract: A method and system for blockchain-based medicine-taking management for a clinical trial subject are disclosed. The method for managing clinical trial medicine-taking comprises the steps of: providing a notification for managing medication for a clinical trial medicine through a medication management app; receiving a medication log of the clinical trial subject by scanning a QR code on the clinical trial medicine through the medication management application; storing the received medication log in a blockchain as medication management information of the clinical trial subject; and verifying the validity of the medication log by using the blockchain.

Abstract: Disclosed is a method of providing a completely automated public turing test to tell a computer and a human apart (CAPTCHA) based on image. The method comprises the steps of: storing a plurality of randomly-selected images by session when a request for a web page is received from a user client; providing the web page and a session ID to the user client; generating a test image by mixing the plurality of images when a request for a test image corresponding to the session ID is received from the user client; transmitting the generated test image to the user client; receiving at least one of first identification information inputted by the user about the test image from the user client; and comparing the first identification information with second identification information included in Meta information of the test image.

Abstract: Disclosed is a method of providing a completely automated public turing test to tell a computer and a human apart (CAPTCHA) based on image. The method comprises the steps of: storing a plurality of randomly-selected images by session when a request for a web page is received from a user client; providing the web page and a session ID to the user client; generating a test image by mixing the plurality of images when a request for a test image corresponding to the session ID is received from the user client; transmitting the generated test image to the user client; receiving at least one of first identification information inputted by the user about the test image from the user client; and comparing the first identification information with second identification information included in Meta information of the test image.

Abstract: The present invention provides a secure user session managing method and system between a client and a server connected through network in web environment. The user session managing method includes: allowing the server to receive a first HTTP request including a cookie from the client, wherein the cookie includes a client authentication value and the client authentication value is calculated by using a shared key stored in the client and session information included in a HTTP response transmitted right before to the client; comparing a server authentication value with the client authentication value included in the cookie, wherein the server authentication value is calculated by employing the session information and the shared key stored in the server; and determining a transmitter's authentication failure or success of the client according to the result of the comparison. User session can be secured by applying the challenge-response authentication algorithm to the HTTP protocol.