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Posted to dev@couchdb.apache.org by "Klaus Trainer (JIRA)" <ji...@apache.org> on 2011/02/05 19:49:30 UTC
[jira] Commented: (COUCHDB-1060) CouchDB should use a secure
password hash method instead of the current one
[ https://issues.apache.org/jira/browse/COUCHDB-1060?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12991031#comment-12991031 ]
Klaus Trainer commented on COUCHDB-1060:
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Do you really think choosing a slow hash function would be a good idea, considering that CouchDB would have to take way more CPU cycles every time somebody authenticates?
I'd approach that concern in a more pragmatic manner. For instance, you could protect the _users database, so that e.g. non-admins cannot read the salts and hashes.
> CouchDB should use a secure password hash method instead of the current one
> ---------------------------------------------------------------------------
>
> Key: COUCHDB-1060
> URL: https://issues.apache.org/jira/browse/COUCHDB-1060
> Project: CouchDB
> Issue Type: Improvement
> Components: Database Core
> Affects Versions: 1.0.2
> Reporter: Nuutti Kotivuori
> Priority: Minor
>
> CouchDB passwords are stored in a salted, hashed format of a 128-bit salt combined with the password under SHA-1. This method thwarts rainbow table attacks, but is utterly ineffective against any dictionary attacks as computing SHA-1 is very fast indeed.
> If passwords are to be stored in a non-plaintext equivalent format, the hash function needs to be a "slow" hash function. Suitable candidates for this could be bcrypt, scrypt and PBKDF2. Of the choices, only PBKDF2 is really widely used, standardized and goverment approved. (Note: don't be fooled that the PBKDF2 is a "key derivation" function - in this case, it is exactly the same thing as a slow password hash.)
> http://en.wikipedia.org/wiki/PBKDF2
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