Encryption
Encryption is the process of transforming information (referred to as plaintext) to make it unreadable to anyone except those possessing special knowledge, usually referred to as a key.
Eudora
Eudora is an e-mail client used on the Apple Macintosh and Microsoft Windows operating systems. It also supports several palmtop computing platforms, including Newton and the Palm OS.
EXE
EXE is the common filename extension for denoting an executable file (a program) in the OpenVMS, DOS, Microsoft Windows, and OS/2 operating systems.