This question already has answers here:
Is it possible to decrypt MD5 hashes?
(24 answers)
Closed 7 years ago.
This is my encryption password.
$encrypted = md5($password);
Can I Decrypt it?
MD5 is a hash function, which are one-way functions (cannot be undone).
Whilst I would not recommend MD5 for password storage, if you want to verify that a password is correct you do not need to decrypt the hash. The idea is in order to verify a password is correct, rather than decrypting the hash, you encrypt the password given and compare the two hash values. If the two hash values are the same, then the two passwords are the same,
Related
This question already has answers here:
How does password salt help against a rainbow table attack?
(10 answers)
How can bcrypt have built-in salts?
(5 answers)
Password hashing, salt and storage of hashed values
(4 answers)
Closed 3 months ago.
I am wondering about how password_verify() verifies the hash, I have reviewed the documentation and many answers in StackOverflow, but I didn't get the idea
because, as I understood, this function will compare the hash with entered password after hashing it again, and use the same salt and cost and algorithm,
but the question here: if anyone can separate the salt from the hashed password, then anybody also can try to use rehash and try to match, and the salt will be useless here. Am I right, or what?
The salt have to be generated randomly each time the fonction is used (and it's what this function does, and not accept custom salt anymore).
For example:
<?php
$password = "nothing";
echo password_hash($password, PASSWORD_DEFAULT);
echo PHP_EOL;
echo password_hash($password, PASSWORD_DEFAULT);
Give the response :
$2y$10$mdJRjsoc1vR11SKa2JDyS.qSlxja/a0SUPuXC1NKsRLkzmayKwjku
$2y$10$H2th6dRY/i.xZzXSGxDZ1uaiwZx6s0.FM0NXcBcBQ0E2aNEHCJ57m
It's the same password with differents results.
The hashed password is stored in a database or a file. In this case, an admin system (or someone who's hacked the database) can't say if the same password is used by differents users. Another point, rainbow tables can't be used with hashed password with salt. Only brut force can be done.
Using the same salt for all is not more secure than using simple hash algorytm.
This question already has answers here:
Is it possible to decrypt MD5 hashes?
(24 answers)
Closed 8 years ago.
I want to get real password which is converted by wordpress into md5 format.
For example,
my md5 password is - 62cc2d8b4bf2d8728120d052163a77df
Real password - demo123.
I want to get real password from md5 version.
I tried this but didn't give me what I want -http://md5encryption.com/
You cannot unhash a password. That is the whole reason you hash a password in the first place.
It is possible to 'brute' force a password, or use a rainbow table to lookup the password - but that is why you (hopefully) used a salt on the password to ensure the hash is unique.
This question already has answers here:
How do you use bcrypt for hashing passwords in PHP? [duplicate]
(11 answers)
How to decrypt hashed password using php?
(4 answers)
Closed 9 years ago.
The following code is what I've used to encrypt a password in PHP...
$password = sha1(sha1($_POST['password']).sha1("mySalt#$#(%"));
What code can I use so users can log in using what they typed?
sha1 is a hashing algorithm, not a 2-way encryption. You cannot retrieve the original password.
Hash the submitted password using the same algorithm.
Fetch, from your database, the password hash for the user in question.
Compare the two hashes. If they match, the credentials are OK.
Don't use sha1 for password hashing, it isn't safe enough
Use a unique salt per credential, don't reuse the same one each time.
You should use crypt for password hashing, sha1/md5 are too weak.
All you need:
function check_password($password) {
...//get db password to compare
if (crypt($post_password, $db_results[0]['password']) == $db_results[0]['password']) {
return true;
} else { return false; }
}
This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
Can I md5(sha1(password))?
$pass = md5($_POST["pass"].sha1($_POST["pass"]))
I saw this somewhere and was confused. Does this read a password and decrypt it using sha1 then md5 or reverse? Or is there some other things that I'm missing?
It is hashing $_POST['pass'] with the sha1 algorithm, then combining that hash with $_POST['pass'], then hashing the resulting combined string with the md5 algorithm.
Why, I have no idea.
What it is doing is that it is concatenating the password with the sha1 hashed version of it (one of these is the salt) then hashing it into an MD5 value.
Actually it hashes the password.
It concatenates the clear password with the sha1'd password. Then it Md5 the whole thing
It hashes it with MD5.
Takes your password from the form, adds a salt and hashes the whole thing.
Note:
The 'salt' is a another hash. It is not a good idea to do it this way, a salt should be a random value that you have made that keeps the password secure.
This question already has answers here:
Closed 12 years ago.
Possible Duplicate:
Is it possible to decrypt md5 hashes?
Reversing an MD5 Hash
hi there is any way to decrypt md5 password field to allow user to edit password in form using javascript. or php.
MD5 is one way hashing algorithm - not a means of encrypting. As such, there's no means of decrypting it - only checking to see if another source input has the same hash.
No, there is no way, since hashing is not a reversible operation.
Your question is not very clear, but recovery of the origional string for hashes can be done with rainbowtables: http://en.wikipedia.org/wiki/Rainbow_table
(if the hash was salted, this will become troublesome ofcourse)
I wrote an app a few years back that brute-forces MD5 hashes against wordlists and previously-cracked MD5 hashes it finds via search engines, see if it comes up with anything for you:
http://bigtrapeze.com/md5/