DECT Standard Cipher is an encryption standard, used in DECT phones to protect communication between a handset and its associated base station. While most of the DECT standard is publicly available, the part describing the DECT Standard Cipher was only available under a non-disclosure agreement to the phones' manufacturers from ETSI.
On June 8, 2002, a posting was made to the alt.anonymous.messages newsgroup containing what was claimed to be the reverse engineered source code of the implementation of the DECT Standard Cipher for the Samsung SP-R6150 telephone.[1] This claim has since been refuted.[2]
In 2008, members of the deDECTed.org project actually did reverse engineer the DECT Standard Cipher,[3] and as of 2010 there has been a viable attack on it that can recover the key.[4]