Before the dissolution of US crypto export regulations, Lotus Notes had a key escrow/backdoor feature called differential cryptography. The export version included 64-bit crypto, with 24 of those bits encrypted for the NSA’s public key. The remaining 40 bits could be brute-forced to obtain the plaintext. It was discovered that the NSA public key had the organizational name “MiniTruth” and the common name “Big Brother.” This alludes to George Orwell’s novel “1984” where the Ministry of Truth is responsible for propaganda and suppression of inconvenient truths, and “Big Brother” is the shadowy leader of the government. The NSA public key is provided in hexadecimal format and as a PGP public key block.
http://www.cypherspace.org/adam/hacks/lotus-nsa-key.html