Cisco Knowledge Suite Cisco SystemsCisco Press
   

   
Home
MyCKS
Cutting Edge
Certification
Core Reference
Guided Learning
   
Networking Architecture
LAN
WAN
Switching
Internet Protocols (IP)
Network Protocols
Transport and Application Protocols
Desktop Protocols
Security and Troubleshooting
Network Resources and Management
Integrated Services
 

ATM Networks and Security

by Dr. Eva Bozoki - May 30, 2000

ATM Networks and Security

1. Introduction

 

2. ATM Connections

 

3. ATM Protocol Basics

 

4. Attacks

 

5. Security Measures

 

6. Placement of the User Plane Security Services

 

7. Secure Call Setup Protocol

 

8. Conclusion

 

Acknowledgement

 

References

 

About the Author

 
   

6. Placement of the User Plane Security Services

In considering the placement of user plane security services, it is important to evaluate the impact of the different locations. Placing the services in or below the ATM layer would require the encryption of the whole cell (header and payload), thereby degrading the switch performance. This would also expose the payload because the switches would have to decrypt and encrypt the cell. The complexity of key management also would be increased because the switches would require encryption/decryption keys. In addition, if the security services were placed in the physical layer, they would have to operate at ATM line speed (in order to deal with invalid and idle cells in addition to the valid cells).

By placing the user plane security services in the AAL layer, the lower-level headers would be transmitted in the clear; therefore, this solution does not provide flow confidentiality. In addition, because AAL is usually implemented as a single unit, no interfaces exist where the security services could be incorporated.

Placing the user plane security services above the AAL layer, the security services would have to be adopted for each higher layer (above AAL), thus multiplying the implementation effort.

This leaves the only suitable solution: The security services must be situated between the AAL and the ATM layers.

 

Previous | Next

 

 

Breaking News

One of the primary architects of OpenCable, Michael Adams, explains the key concepts of this initiative in his book OpenCable Architecture.

Expert Advice

Ralph Droms, Ph.D., author of The DHCP Handbook and chair of the IETF Dynamic Host Configuration Working Group, guides you to his top picks for reliable DHCP-related information.

Just Published

Residential Broadband, Second Edition
by George Abe

Introduces the topics surrounding high-speed networks to the home. It is written for anyone seeking a broad-based familiarity with the issues of residential broadband (RBB) including product developers, engineers, network designers, business people, professionals in legal and regulatory positions, and industry analysts.

             
     

From the Brains at InformIT

|

Contact Us

|

Copyright, Terms & Conditions

|

Privacy Policy

 

© Copyright 2000 InformIT. All rights reserved.