Transcript Project Demonstration

Project Demonstration
Mobile Adaptive Computing
Craig Dowie
28th June 1998
Project Goals
• Investigation 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)
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
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)
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
Physical Configuration
Ricochet
Cree
Ricochet
Ricohet
Arapahoe
Null
Ricochet
Sioux
Null
(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
(TCP/IP) Network Configuration
Cree
1.1.1.11
1.1.1.13
Arapahoe
1.1.1.3
1.1.1.12
Sioux
1.1.1.2
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
Security Configuration
Cree
(Eve)
Arapahoe
(Alice)
Sioux
(Bob)
Demo Information flow
Cree
KEY
KEY
Arapahoe
DATA
KEY
Sioux
DATA
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)
Thank You!
• Please feel free to ask any unanswered
questions!