Honeywords: Making Password-Cracking Detectable

Abstract
 
We suggest a simple method for improving the security of hashed passwords: the maintenance of additional "hon-eywords" (false passwords) associated with each user's account. An adversary who steals a file of hashed passwords and inverts the hash function cannot tell if he has found the password or a honeyword. The attempted use of a honeyword for login sets off an alarm. An auxiliary server (the "honeychecker") can distinguish the user password from honeywords for the login routine, and will set an alarm if a honeyword is submitted.
 
Authors: Ari Juels, Ronald L. Rivest
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