Guinet works as a security expert, Suiche is an internationally known hacker, and Delphy took part at night, in his spare time, outside his day job at the Banque de France. The tool, however, works only on computers running on Windows XP.
Read more here: http://clicklancashire.com/2017/05/21/wannacry-ransomware-decryption-tool-released.html
