What is Bcrypt?
Bcrypt is a widely-used cryptographic hashing function specifically designed to securely store passwords. It is part of the Blowfish cipher family and includes a built-in feature that makes the hashing process slow, which helps defend against brute-force attacks.
Why Use Bcrypt?
Security Against Brute-Force Attacks: Bcrypt introduces computational complexity, making it much harder for attackers to guess passwords through brute force.
Salting: Bcrypt automatically adds a unique salt to each password before hashing it. This makes identical passwords have different hashes, protecting against rainbow table attacks.
Adjustable Work Factor: You can configure the “cost” or work factor, which defines how many rounds of processing it will take to hash a password. As hardware improves, you can increase the work factor to keep password security strong without changing the stored hashes.
Well-Tested and Secure: Bcrypt has been around for decades and is trusted by many in the security community. It’s widely used in production applications.
How to Use Bcrypt
To get started with Bcrypt in a Node.js app, you can install it using npm:
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npm install bcrypt
Here’s a typical way to use Bcrypt in your code:
<ol>
<li>Hashing a Password
First, you need to hash the password before storing it in the database:</li>
</ol>
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const bcrypt = require(‘bcrypt’);
// Generate a salt and hash the password
const saltRounds = 10; // The cost factor (higher = slower but more secure)
const plainPassword = ‘userpassword123’;
bcrypt.hash(plainPassword, saltRounds, (err, hash) =&gt; {
if (err) throw err;
// Store the hash in the database
console.log(‘Hashed password:’, hash);
});
2. Verifying a Password
When a user logs in, you need to compare the provided password with the stored hashed password:
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const hashedPassword = ‘stored-hash-from-db’;
bcrypt.compare(plainPassword, hashedPassword, (err, isMatch) =&gt; {
if (err) throw err;
if (isMatch) {
console.log(‘Passwords match!’);
} else {
console.log(‘Passwords do not match.’);
}
});
When to Use Bcrypt
Bcrypt should be used in any application where user authentication is involved and passwords are stored. This includes web apps with login systems, APIs that handle user credentials, and any service where sensitive data like passwords must be protected.

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Bcrypt is a cryptographic hashing function designed for securely storing passwords. It offers protection against brute-force attacks by introducing computational complexity, automatically adds a unique salt to each password to prevent rainbow table attacks, and allows for an adjustable work factor to stay secure as hardware improves. Bcrypt is trusted by the security community and is commonly used in applications requiring user authentication.

How does bcrypt make websites secured