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What is Bcrypt Generator ?

A cryptographic hash function called Bcrypt Generator was created to securely hash passwords and store them in the backend of applications so that dictionary-based cyberattacks are less likely to succeed. Niels Provos and David Mazières developed it in 1999, building on the Blowfish cipher method.

Through the complex hashing algorithm used by Bcrypt, a user's password is converted into a fixed-length string of characters. It makes use of a one-way hash function, which means that once the password has been hashed, it cannot be unhashed. Bcrypt hashes the password again each time a user enters into their account, comparing it to the version kept in the system's memory to see if the passwords match.

Rather than just hashing the supplied password, bcrypt adds a random bit of information, known as salt, to produce a distinct hash that is nearly hard to crack using automated guesses made during hash dictionary and brute force attacks.

Another unique feature of Bcrypt above other hashing algorithms is that it makes use of a cost factor. It allows you to set how many hashing rounds and password iterations to run, which raises the time, effort, and computational resources required to get the final hash result. The cost factor turns bcrypt into a secure password storage tool by making it a slow algorithm that takes a lot longer to generate a hash key.

The password hashing algorithm of bcrypt uses base 64 encoding to generate a 24-byte hash by combining the password string, salt, and cost.

Let's examine each hash element in more detail

string for the password. To generate an unbreakable hash, a strong password is required. For this reason, bcrypt added a feature that strengthens passwords. A plain text password can be extended to be longer and more complex if it is too short. Although typically up to 56 bytes are utilized to construct a 31-character hash, Bcrypt permits up to 72 bytes for a password. The calculated 24-byte hash may contain up to 23 bytes from the password input.

Salt. It adds a random 16-byte salt value before the password in plain text. After that, the salt is hashed, producing a string of 22 characters that is appended to the password hash.

Factor of cost. To indicate how many password iterations were made prior to the hash being generated, a numerical cost is appended before the salt and the password hashes.

The hash algorithm identities for Bcrypt, $2a$, $2y$, or $2b$, are then appended to the hash string.