Server-assisted regeneration of a strong secret from a weak secret
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United States of America Patent
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Apr 15, 2008
Grant Date -
Dec 27, 2001
app pub date -
Mar 12, 2001
filing date -
Mar 10, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
Methods for regenerating a strong secret for a user, based on input of a weak secret, such as a password, are assisted by communications exchanges with a set of independent servers. Each server holds a distinct secret value (i.e., server secret data). The strong secret is a function of the user's weak secret and of the server secret data, and a would-be attacker cannot feasibly compute the strong secret without access to both the user's weak secret and the server secret data. Any attacker has only a limited opportunity to guess the weak secret, even if he has access to all messages transmitted in the generation and regeneration processes plus a subset (but not all) of the server secret data.
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