Since version 2.1, PGP ("Pretty Good Privacy") has been rigged to allow the NSA to easily break encoded messages. Early in 1992, the author, Paul Zimmerman, was arrested by Government agents. He was told that he would be set up for trafficking narcotics unless he complied. The Government agency's demands were simple: He was to put a virtually undetectable trapdoor, designed by the NSA, into all future releases of PGP, and to tell no-one.
This is wrong, and easily disproven. There was no way to put a trap door in PGP because the source code was made publically available. Modifying every C compiler in the world is just not realistic. However, the situation has become considerably different with PGPfone. Source code to PGPfone is kept extremely secret. A few outsiders may be given the source to review, but they will not be allowed to compile and distribute it. Only binaries of PGPfone compiled by the authors will be available. Some interesting portions of the program have even been intentionally obfuscated to make them extremely difficult to disassemble and analyze. With PGPfone, a back would be considerably easier to install...