 The name was suggested in or before 2002 by Brian Zill at Microsoft Research.The term pseudospoofing had previously been coined by L. Detweiler on the Cypherpunks mailing list and used in the literature on peer-to-peer systems for the same class of attacks prior to 2002, but this term did not gain as much influence as "Sybil attack".Sybil attacks are also called sock puppetry.