Dynamic Port Selection for Headless Server Security
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Solution Overview
Problem
Existing access control systems for headless servers, such as those in critical infrastructure like electrical power grids, lack sufficient security measures to prevent eavesdropping and tampering, particularly when an eavesdropper identifies a known port used for encrypted message exchange, allowing potential injection of instructions or code into the server.
Innovation Solution
A system and method that establishes secure access by authenticating a client device through a hashing algorithm and encryption/decryption means, then randomly selects a port and generates a session key for secure communication, ensuring only authorized personnel can modify server resources, using a combination of microcontrollers and encryption techniques to secure access to end-point server programs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a known port is used for encrypted message exchange between client and server, then access control and communication are established, but the system becomes vulnerable to eavesdropping and injection attacks when the port is identified
Solution Approach 1:
The patent implements dynamic port selection where the server randomly selects a port number for each communication session instead of using a fixed known port. This dynamic change prevents eavesdroppers from targeting a specific port, as the port number varies with each session. The system maintains reliability by establishing secure encrypted communication through this dynamic port mechanism while eliminating the vulnerability of static port exposure.
Solution Approach 2:
The patent performs preliminary port selection and encryption key generation before actual data transmission begins. The server randomly selects a port number and generates encryption keys in advance of the communication session, then uses these predetermined values to establish secure encrypted communication. This preliminary action ensures that the communication channel is secured before any data exchange occurs, preventing eavesdropping and injection attacks.
2Productivity
If symmetric encryption is used for message transmission, then communication efficiency is improved, but key distribution creates security vulnerabilities as the secret key must traverse the transmission medium
Solution Approach 1:
The patent introduces an intermediary key generation mechanism where the server generates random encryption keys and transmits them to the client through a secure key distribution channel. This intermediary process separates the key distribution function from the data transmission function, allowing symmetric encryption to be used efficiently for bulk data communication while the key exchange is handled through a dedicated secure mechanism, thus maintaining both productivity and reliability.
3Reliability
If asymmetric encryption with digital certificates is used, then authentication and key distribution security are improved, but system complexity increases
Solution Approach 1:
The patent segments the encryption system into distinct functional components: a key management module that handles asymmetric encryption and digital certificate verification, and a data transmission module that uses symmetric encryption for efficient communication. This segmentation allows the system to leverage the security benefits of asymmetric encryption for authentication and key exchange while using the efficiency of symmetric encryption for bulk data transfer, thereby improving reliability without proportionally increasing overall system complexity.
Data Source
AI summary
Provided is a system and method for enabling secure access to a desired end-point server program of at least one end-point server program. The system includes a server having a security server program and the end-point server programs, and a client. During operation, the server establishes a first connection with the client via a known port, causes an end-point program applet and web page associated with the desired end-point server program to be forwarded to the client. While executing the security server program, the server: verifies client access rights via a first encryption means, generates, encrypts and transmits to the client a random port number and a session key, and detects establishment of a second connection between the client and a random port of the server. The second connection enables secure access by the client to the desired end-point server program using a second encryption means and the session key.