Hashed Password Exchange

Document Type Expired Internet-Draft (individual)
Author Steven Bellovin 
Last updated 2012-09-12 (latest revision 2012-03-11)
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


Many systems (e.g., cryptographic protocols relying on symmetric cryptography) require that plaintext passwords be stored. Given how often people reuse passwords on different systems, this poses a very serious risk if a single machine is compromised. We propose a scheme to derive passwords limited to a single machine from a typed password, and explain how a protocol definition can specify this scheme.


Steven Bellovin (bellovin@acm.org)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)