The market for Personal Digital Assistants (PDAs) is growing at a rapid pace. An increasing number of products, such as the PalmPilot, are addingwireless communications capabilities. PDA users are now able to send andreceive email just as they would from their networked desktop machines. Because of the inherent insecurity of wireless environments, a system is needed for secure email communications. The requirements for the security system will likely be influenced by the constraints of the PDA, including limited memory, limited processing power, limited bandwidth, and a limited user interface.

This paper describes our experience with porting PGP to the Research inMotion (RIM) two-way pager, and incorporating elliptic curvecryptography into PGP's suite of public-key ciphers. Our main conclusionis that PGP is a viable solution for providing secure and interoperableemail communications between constrained wireless devices and desktopmachines.