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Specific builds/installs of older versions of PHP may or may not support the CRYPT_BLOWFISH and CRYPT_EXT_DES methods - this is system-specific.For example, the Suhosin PHP security hardening patch, included into many distributions' packages of PHP, has been adding support for CRYPT_BLOWFISH for years, many operating systems - such as *BSD's, Solaris 10, SUSE Linux, ALT Linux, and indeed Openwall GNU/*/Linux - are also providing support for CRYPT_BLOWFISH via the system libraries (which PHP uses), and some operating systems - *BSD's, Openwall GNU/*/Linux - also provide support for CRYPT_EXT_DES.The choice of the underlying cryptographic primitive - such as MD5, SHA-1, SHA-256, or even Blowfish or DES (which are block ciphers, yet they may be used to construct one-way hashes) - does not matter all that much. " - It is true that MD5 has been broken as it relates to certain attacks (practical).It's the higher-level password hashing method, employing salting and stretching, that makes a difference. SHA-1 has also been broken in certain other ways (mostly theoretical).Besides, the password hash is typically only computed when a user logs in , which occurs relatively infrequently (compared to the frequency of other requests).Subsequent requests by the logged in user will use a session ID instead.The use of SSL mitigates the risk of having some plaintext passwords captured while in transit. An attacker capable of capturing some of the network traffic is not necessarily capable of getting a copy of the database, and vice versa.Thus, it makes perfect sense to use one of these countermeasures - password hashing and SSL - without the other (which does not address "the other" risk then), and it also makes sense to use both of them together.

Preferably, the number of iterations should not be hard-coded, but rather it should be configurable by an administrator for use when a new password is set (hashed), and it should be getting saved along with the hash (to allow the administrator to change the iteration count for newly set/changed passwords, yet not break support for previously-generated password hashes). That's significant - it is roughly equivalent to each passphrase containing one additional word, without actually adding that extra word and having the users memorize it.More often, people would make an incorrect statement that you don't need password hashing, or don't need to do it right, because you do or because you don't use SSL.) Also, the cost of recovery from an incident like this may be reduced - rather than change all passwords at once, which may be costly or prohibitive to do, a system's administrator may audit the password hashes with a tool such as John the Ripper and only have the weak passwords changed.With proper password hashing and password policy enforcement in place, the majority of the passwords could be considered "strong enough" and would not need to be changed immediately even after a known and otherwise-resolved security compromise.I will start by briefly explaining password/passphrase hashing and how to access the database safely.Then we will proceed through several revisions of the sample program.

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