I did some very light digging, and I found out that Drupal uses a stripped down version of PHPass. "A cut-down and reworked version of phpass (supporting the p

I did some very light digging, and I found out that Drupal uses a stripped down version of PHPass. "A cut-down and reworked version of phpass (supporting the portable hashes only and requiring PHP 5+) has been integrated into development versions of Drupal leading to the Drupal 7 release, after a lengthy discussion and many proposed patches against various development versions of Drupal. There's a notion of upgraded hashes - these are phpass portable hashes of md5() hashes (which were used by older versions of Drupal), with the final hash encodings prefixed with a "U" (for "upgraded"). A more recent lengthy discussion has resulted in Drupal 7 switching from MD5 to SHA-512 for the underlying cryptographic primitive in phpass' "portable" hashes (making them less portable) while preserving "read-only" support for the MD5-based portable hashes. There was no valid technical nor security reason for this change, so it was made purely for "political" reasons. Drupal 7's SHA-512 based phpass-like hash encoding strings use "$S$" as the hash type identifier. There's also a module for Drupal 5 & 6 that makes the original phpass available with those versions of Drupal, including support for the more secure but not nearly as portable CRYPT_BLOWFISH and CRYPT_EXT_DES hashes." SOURCE: http://www.openwall.com/phpass/ http://www.openwall.com/phpass/ While MD5 is insufficient, SHA-512 (default D7) and CRYPT_BLOWFISH offer very good alternatives. Overall, from my understanding, the biggest issue with Drupal is websites that are either running an old version, or used to run an old version but never forced users to reset their password.