Method for decoding secure socket layer for security of packet transmitted in preset operating system

A non-transitory computer-readable medium storing instructions that, when executed by a processor, cause the processor to perform a secure socket layer (SSL) decoding method, comprising:

• detecting, by an SSL decoding device, a packet associated with an SSL handshake for an SSL connection between a client and a server after a transmission control protocol (TCP) session between the client and the server is established;
• verifying whether the packet associated with the SSL handshake is a packet transmitted from a preset operating system (OS);
• when the packet associated with the SSL handshake is the packet transmitted from the preset OS, establishing an SSL between the client and the SSL decoding device and establishing an SSL between the SSL decoding device and the server;
• establishing a TCP session between a virtual client corresponding to the client and a virtual server corresponding to the server, and transmitting, to a security device, a packet transmitted and received between the virtual client and the virtual server when establishing the TCP session;
• and
• when a first SSL packet transmitted from the client to the SSL decoding device is received, decoding the first SSL packet and transmitting the decoded first SSL packet to the security device, and re-encoding the decoded first SSL packet and transmitting the re-encoded first SSL packet to the server,
• when a third SSL packet transmitted from the server to the SSL decoding device is received, decoding the third SSL packet and transmitting the decoded third SSL packet to the security device, and re-encoding the decoded third SSL packet and transmitting the re-encoded third SSL packet to the client,
• wherein the decoding of the third SSL packet and the transmitting of the decoded third SSL packet to the security device, and the re-encoding of the decoded third SSL packet and the transmitting of the re-encoded third SSL packet to the client comprises:
• when the third SSL packet transmitted from the server to the SSL decoding device is received, decoding the third SSL packet;
• generating a second TCP packet including a payload of the decoded third packet and to be transmitted from the virtual server to the virtual client;
• transmitting the second TCP packet to the security device;
• generating a fourth SSL packet including the payload of the decoded third SSL packet;
• and
• transmitting the fourth SSL packet to the client.