MD5 is an algorithm function that calculates a hash for a text. When you need to store a secret or check if a text wasn't modified, you must do a checksum and keep the hash result. In the following verification, we compare the hashes.
MD5 is considered the most popular digest function and is widely used. This can also be considered a con because many hackers have the hash for billions of passwords.
Suppose a website uses the MD5 algorithm to store passwords, and their database is compromised. In that case, most of the users are in serious danger because their password was revealed
Yahoo caused one of the most significant data breaches of MD5. The company used the MD5 function to store passwords, but their database was compromised, and billions of accounts were hacked. The conclusion is not to use MD5 to store passwords.
The most significant is that hashing is a one-way function and encryption can be two ways. This means that from the result of hashing, you cannot get the initial value, so it's irreversible. Encryption can be decrypted.
That's why the passwords must be hashed and not encrypted, because someone can decrypt that password.
The salt is a sequence of random characters that are combined with the initial password and the result is hashed. This is a more secure way to store passwords because hackers cannot use the dictionary method to crack the hashes.
For example, if a user's password is 123456, using a random salt will secure his passwords from a dictionary attack because password hash is different using salt than without salt.
No, this cryptographic function can't be decrypted, but there are many sources where you can find for words their hashes. Based on dictionaries, someone can know for which word is the encryption.
Yes, it's 100% free to use.
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