1. Project Demonstration Mobile Adaptive Computing Craig Dowie 28th June 1998

2. Project Goals multiple, physically disjointInvestigation into improving the security and reliability of data transmissions between hosts by the use of multiple, physically disjoint communications links E.g. naturally disjoint wireless links ( RF modems, Infra-Red, etc), distinct network links on WAN (e.g. Internet)

3. This demo... … demonstrates some concepts behind project work … demonstrates secure transmission of data between hosts using two physically disjoint paths …illustrates how a single path can be compromised without affecting data security … uses a trivial (XOR) encryption scheme

4. System Components Hosts: 3 Pentium MMX Laptops with additional serial comms interfaces (PC card) Operating System Environment: Windows NT 4.0 Connections: Null modems, Ricochet SX RF wireless modems, FreeWave DGR-115/H RF wireless modems (not used in demo)

5. Physical Configuration 3 physical connections:- Arapahoe to Cree : Wireless Ricochet Sioux to Cree : Wireless Ricochet Arapahoe to Sioux : Null Modem (RS-232) Additional possible paths: Telephone connections, ethernet LAN connections, Freewave wireless connections

6. Physical Configuration Ricohet Arapahoe Null Ricochet Sioux Null Ricochet Cree Ricochet

7. (TCP/IP) Network Configuration The connections are designed to model two disjoint data paths between hosts Arapahoe and Sioux (the left and right laptops) Cree (in the middle) models an eavesdropper - ‘snooping’ on one of the paths (or TTP) In practice, stores from Arapahoe and forwards it to Sioux

8. (TCP/IP) Network Configuration 1.1.1.13 Arapahoe 1.1.1.3 1.1.1.12 Sioux 1.1.1.2 Cree 1.1.1.11

9. Demo Information Flow Arapahoe: reads data to be sent from a file; generates a key and encrypts the data Transmits the data along null modem connection (directly to Sioux) Transmits the key along the wireless (Ricochet) path to Sioux (via Cree) Cree ‘intercepts’ and displays the key

10. Security Configuration Arapahoe (Alice) Sioux (Bob) Cree (Eve)

11. Demo Information flow KEY Arapahoe DATA KEY Sioux DATA Cree KEY

12. Continuing Work Multiple path socket class based on TCP/IP sockets Multiple path and node management software (COMPASS) Further investigation of wireless and communications hardware (e.g. wireless ethernet technology)

13. Thank You! Please feel free to ask any unanswered questions!