System and method for security using one-time execution code

A security server using a one-time execution code in an environment in which the server and a client are connected through a network, comprising:

• a one-time execution code generator generating and transmitting the one-time execution code to the client;
• a result analyzer analyzing an execution result of the one-time execution code transmitted from the client to determine whether or not an error occurs in the result;
• and
• a client connection controller blocking the connection with the client when the result analyzer finds the error.

A security method comprising:

• receiving a one-time execution code from a server;
• loading the received one-time execution code on a code container in a memory area of a client program that is currently executed;
• executing the loaded one-time execution code and transmitting the execution result to the server;
• and
• deleting the loaded one-time execution code after the execution result is transmitted to the server.

A security method comprising:

• generating and transmitting a one-time execution code to a client connected through a network;
• receiving the execution result of the one-time execution code from the client and analyzing the execution result;
• and
• blocking the connection with the client when an error is found in the result.