TRANSEC BASIC VT idirect, Inc.

Transcription

1 TRANSEC BASIC 2008 VT idirect, Inc.

2 Security Tradeoffs DVB-S2 DVB-S2 w/aes Efficiency infiniti infiniti w/aes S2 TRANSEC ACM S2 TRANSEC CCM infiniti TRANSEC Anti-Jam/Low Prob of Detect Security

3 What is TRANSEC? Transmission security (TRANSEC) prevents an adversary from exploiting information available in a communications channel even without defeating encryption With only link encryption, an adversary can still answer questions like: What types of applications are active on the network? Who is talking to whom? Is the network or a particular remote site active now? Based on traffic analysis, what is the correlation between network activity and real world activity? Is a particular remote site moving? Is there significant acquisition activity?

4 TRANSEC Goals TRANSEC Requirement Mask Channel Activity Control Channel Information Hub and Remote Authentication and Validation Benefits Prevents transmission activity from being used as an intelligence gathering Detection of repetitive data streams unsuccessful Ensures only authorized use of network resources

5 TRANSEC Goals Mask Channel Activity Transmission activity can be used as an intelligence gathering mechanism TDMA carriers are based on dynamic traffic bursts so changing traffic volumes and number of active senders can be detected. DVB-S2 carriers send easily identifiable fill frames when there s no user data to send These vulnerabilities allow adversaries to extrapolate information on timing, location or scale of strategic activities

6 TRANSEC Goals Mask Channel Activity TRANSEC negate these risks by: Using Free Slot Allocation for TDMA bandwidth distribution Creates a constant wall of data regardless of traffic profiles Free slots preserve bandwidth efficiencies of TDMA Empty bursts are indistinguishable from user data Creating fill-frames with random data for underutilized DVB-S2 carriers Empty frames are indistinguishable from user data Obfuscating acquisition activity Creates traffic in the acquisition slot when no remotes are actually joining the network Suppresses acquisition slot bursts even when remotes are acquiring

7 TRANSEC Goals Control Channel Information When only user data payloads are encrypted, a great deal of data is still available Both Layer 2 and Layer 3 packets have traffic engineering information (source, destination, priority, size) embedded in their headers Size and priority information can betray the type of application in use Source and destination tell an adversary who is talking and when Control information sent in the clear can reveal network activity levels

8 TRANSEC Goals Control Channel Information TRANSEC solves this by: Encrypting both payload and header information even at Layer 2 Independently encrypting network control information Changing encryption keys frequently

9 TRANSEC Goals Hub and Remote Validation Unauthorized use of network resources can lead to a man-in-the-middle attack A remote might be spoofed and inserted into a secure network A secure remote might be coerced into joining an insecure network While these kinds of attacks are extremely difficult even in non-transec environments, the risk of eavesdropping cannot be ignored

10 TRANSEC Goals Hub and Remote Validation TRANSEC eliminates these threats by: Using public-key cryptography Key distribution Message authentication Employing X.509 standards for: Verifying identities Establishing trust between network elements Providing methods for dealing with security compromises

11 TRANSEC Solution Hub System XXLMXXLLMLX LLVLMXX XLM VMXXMM XXXMVLL Wall of Data KR IV XXLMXXLLMLX LLVLMXX XLM VMXXMM XXXMVLL KR IV SA DA TOS X.509 Certificate ACC key IP encryptor SA DA TOS ACC key DCC key SA DA TOS Demand Header DID Strong Authentication DID # Public Key Signature X.509 Certificate DCC key Evolution e8000 Series Remotes IP encryptor WAN DID # Public Key Signature ACC key DCC key Protocol Processor TRANSEC Hub Evolution e8000 Series Remotes IP encryptor

12 Our TRANSEC Solution At a Glance TRANSEC Requirements Mask channel activity idirect s Solution Free slot allocation creating uniform size of all TDMA slots Wall of Data and Acquisition Obfuscation Benefits Negates the risk of using transmission activity as intelligence gathering mechanism Control Channel Information FIPS certified encryption 256 bit keyed AES encrypted Over-the-air key update feature Detection of repetitive data streams unsuccessful Hub and Remote authentication and validation Public and private key encryption on remotes and hubs X.509 digital certificates Ensures remotes and hubs are authorized and validated Installation of TRANSEC-enabled networks made easy