In regards to your error and what’s missing in your code. m is a name which is not defined for getmd5() function. No offence, I know you are a beginner, but your code is all over the place. Let’s look at your issues one by one 🙂 First, you are not using hashlib.md5.hexdigest() method correctly. … Read more
For storing passwords no fast hash function which include md5 and SHA1/2 (even when salted) is acceptable. You need to use a slow hash, typically in the form of a Key-Derivation-Function to slow down brute-force. PBKDF2 and bcrypt are popular choices. You should also use a random per user salt.
Since everyone until now has simply defined what a hash function was, I will bite. A one-way function is not just a hash function — a function that loses information — but a function f for which, given an image y (“SE” or 294 in existing answers), it is difficult to find a pre-image x … Read more
No. MD5 is not encryption (though it may be used as part of some encryption algorithms), it is a one way hash function. Much of the original data is actually “lost” as part of the transformation. Think about this: An MD5 is always 128 bits long. That means that there are 2128 possible MD5 hashes. … Read more
Joomla passwords are MD5 hashed, but the passwords are salted before being hashed. They are stored in the database as {hash}:{salt} this salt is a random string 32 characters in length. So to create a new password hash you would do md5($password.$salt) EDIT Okay so for checking a password, say a user myguy enters the … Read more
The collision resistance property of MD5 has been broken for a long time. Note that that preimage resistance and second preimage resistance have not yet been cracked, however as there are better algorithms out there (SHA-2) it would be wise to move to these rather than relying on a cryptographic hash that has already begun … Read more
You need to read the file in chunks of suitable size: def md5_for_file(f, block_size=2**20): md5 = hashlib.md5() while True: data = f.read(block_size) if not data: break md5.update(data) return md5.digest() Note: Make sure you open your file with the ‘rb’ to the open – otherwise you will get the wrong result. So to do the whole … Read more
Here is an implementation you can use (updated to use more up to date Java conventions – for:each loop, StringBuilder instead of StringBuffer): public static String md5(final String s) { final String MD5 = “MD5”; try { // Create MD5 Hash MessageDigest digest = java.security.MessageDigest .getInstance(MD5); digest.update(s.getBytes()); byte messageDigest[] = digest.digest(); // Create Hex String … Read more
Basically it’s because the output of MD5 contains less information than the input. This is basically what distinguishes a hash algorithm from an encryption algorithm. Here’s a simple example: imagine an algorithm to compute the hash of a 10-digit number. The algorithm is “return the last 2 digits.” If I take the hash of 8023798734, … Read more
Yes. MD5 has been completely broken from a security perspective, but the probability of an accidental collision is still vanishingly small. Just be sure that the files aren’t being created by someone you don’t trust and who might have malicious intent.