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From "Christopher Tubbs (JIRA)" <>
Subject [jira] [Created] (ACCUMULO-4044) Stronger/standardized password hashing
Date Thu, 29 Oct 2015 17:31:28 GMT
Christopher Tubbs created ACCUMULO-4044:

             Summary: Stronger/standardized password hashing
                 Key: ACCUMULO-4044
             Project: Accumulo
          Issue Type: Improvement
            Reporter: Christopher Tubbs
             Fix For: 1.8.0

Currently, Accumulo stores hashed passwords using SHA-256 and an 8-byte salt, in a custom
output format.

Instead, we should switch to using commons-codec's Crypt class to create crypt(3) style hashes,
the default of which is to use SHA-512 with a 16-byte salt. The format is stored in a standard
way, with an identifier to determine the hashing method which was used.

We'd have to make sure that we can tell the difference between the new format and the old
format, so we know how to properly verify user credentials. This would be easy if we stored
the new form in a different zookeeper node, but we could also use a delimiter (not a fan of
the delimiter, personally, because I'd prefer the standard format, unmodified). We might be
able to automatically migrate to the new format upon authentication, so we can eventually
drop the old format entirely*.

* When we do eventually drop the old format, users will need to reset their passwords, or
have an admin user do it for them. This shouldn't be a big issue if we wait a sufficient number
of releases to drop the old format.

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