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Ensuring Data Security in X.25 Networks

Learn about X.25 protocol, security mechanisms, device operations, virtual circuits, threats, and solutions for securing data transmission. Explore key management, encryption, and fast processing with RSA technology. Discover the reliability and cost-effectiveness of X.25 for WAN communication.

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Ensuring Data Security in X.25 Networks

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  1. “DATA SECURITY IN X.25 NETWORKS” Advisor: Mr. Anisur Rahman

  2. INTRODUCTION • X.25 : An ITU-T protocol for WAN Communication. • User to Network Interfacing (UNI); DTE – DCE Interface. • Many channels share one physical connection. • Security mechanism: • Data Encryption for secrecy • Data & Entity Authentication for preserving Data Integrity

  3. X.25 Network Devices • DTE – Data Terminal equipment • DCE – Data Circuit-terminating Equipment • PSE – Packet Switching Exchange • PAD – Packet Assembler / Disassembler

  4. X.25 Network Device Operation

  5. Virtual Circuits • Virtual Call • Two Types of Virtual Circuits: • Switched virtual circuit (SVC): Phone call • Permanent virtual circuit (PVC): Leased lines • Up to 4095 VCs on one X.25 interface

  6. X.25 Protocol Suite • PLP – Packet Layer Protocol • LAPB – Link Access Procedure – Balanced • X.21bis Protocol

  7. Threats to Data Security in X.25 • Passive Wiretap : Tapping into the carrier medium and reading the data. • Active Interference : Modification of Data during transmission.

  8. Security Requirements • Operational • Secure Key Management • Approval

  9. X.25 Security Problem • The Key Management Problem • General • Layer 6 and 7 • Layer 3

  10. Basis of Solution • Unit Unique RSA Keys • Key Encrypting Keys (KEKs) • Data Encrypting Keys (DEKs)

  11. Fast RSA Processing • Completely automated key management across the network • Relies on RSA for the secure mechanisms • Reliant on RSA co-processor in each crypto unit • Power to perform a 512-bit RSA decryption under a second

  12. CONCLUSION • Developed to overcome the problems inherent in transmitting the data over low quality copper wires. • Ensured reliable transmission of data over WAN with supported speed of up-to 56 Kbps. • Added overhead and processing imposed on the transmission to achieve high level of reliability was a drawback. • But still remains cost effective and viable alternative for low speed connectivity among many locations.

  13. THANK YOU !

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