# What is key stretching algorithm?

## What is key stretching algorithm?

In cryptography, key stretching techniques are used to make a possibly weak key, typically a password or passphrase, more secure against a brute-force attack by increasing the resources (time and possibly space) it takes to test each possible key.

## What is the difference between salting and key stretching?

They could guess passwords, hashing each with a salt value, to see if any hash values match. They would start with the most common passwords and probably get some matches. Key stretching is a way to make this brute force search more time consuming by requiring repeated hashing.

What is Rfc2898DeriveBytes C#?

The Rfc2898DeriveBytes class can be used to produce a derived key from a base key and other parameters. In a password-based key derivation function, the base key is a password and the other parameters are a salt value and an iteration count.

### What are two key stretching algorithms?

Two common key stretching techniques are bcrypt and Password-Based Key Derivation Function 2 (PBKDF2): Bcrypt. Based on the Blowfish block cipher, bcrypt is used on many Unix and Linux distributions to protect the passwords stored in the shadow password file.

### What is salting in cryptography?

In cryptography, a salt is random data that is used as an additional input to a one-way function that hashes data, a password or passphrase. Salts are used to safeguard passwords in storage.

bcrypt is a password-hashing function designed by Niels Provos and David Mazières, based on the Blowfish cipher and presented at USENIX in 1999.

#### How long is password salt?

Every salt should ideally have a long salt value of at least the same length as the output of the hash. If the output of the hash function used is 256 bits or 32 bytes, the length of the salt value should at least be 32 bytes.

#### What is Rijndaelmanaged in C#?

This C# program is used to demonstrate how to generate a persistent (i.e. non-random) symmetric key using the Rijndael and use this key to encrypt and decrypt a text string. The key is derived from several characteristics passed to encryption and decryption routines.

Is Argon2 better than Bcrypt?

Argon2 – Practical Cryptography for Developers. ​Argon2 is modern ASIC-resistant and GPU-resistant secure key derivation function. It has better password cracking resistance (when configured correctly) than PBKDF2, Bcrypt and Scrypt (for similar configuration parameters for CPU and RAM usage).

## What is salting in cyber security?

Password salting is a technique to protect passwords stored in databases by adding a string of 32 or more characters and then hashing them. Salting prevents hackers who breach an enterprise environment from reverse-engineering passwords and stealing them from the database.

## Is salting legal?

One of the ways unions organize workers is by salting—when a union organizer gets a job at a company with the intent of organizing workers from within. Salting is legal, but employers tend to not be too fond of people who do it.

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