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jBCrypt is a Java implementation of OpenBSD's Blowfish password hashing algorithm, as described in "A Future-Adaptable Password Scheme" by Niels Provos and David Mazieres (USENIX, 1999).
Versions of jBCrypt before 0.3 suffered from a bug related to character encoding that substantially reduced the entropy of hashed passwords containing non US-ASCII characters. An incorrect encoding step transparently replaced such characters by '?' prior to hashing. In the worst case of a password consisting solely of non-US-ASCII characters, this would cause its hash to be equivalent to all other such passwords of the same length.
jBCrypt-0.3, available from http://www.mindrot.org/projects/jBCrypt/ fixes this bug. Please note that passwords containing international characters that were hashed using a previous version of jBCrypt will not verify using jBCrypt-0.3. This may necessitate re-hashing of such passwords.
This bug was responsibly disclosed by Aliaksandr Radzivanovich.
Damien Miller <firstname.lastname@example.org> February 1, 2010
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