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.

- incorporation of appropriate suggestions, a
**HEKS algorithm**can become a standard for key stretching, just as DES and 3DES are standards for ciphers and SHA1 and MD5 are standards for hash functions. I would argue that deployment of a good standard key stretcher would have a

Contents

- 1 Which are key stretching algorithms?
- 2 What is the meaning of the key stretching technique and how it is related to salt and pepper?
- 3 What is Diffie Hellman most commonly used for quizlet?
- 4 What is the biggest drawback to symmetric key encryption?
- 5 Is Bcrypt a key stretching?
- 6 What are some methods used to strengthen a key?
- 7 What is a secret algorithm?
- 8 What is lightweight cryptography?
- 9 Is a key exchange algorithm that enables two user to securely exchange a key that can then be used for subsequent symmetric encryption of messages?
- 10 Which of the following is not a hashing algorithm?
- 11 What is RSA algorithm in cryptography?
- 12 What is DES algorithm in cryptography?
- 13 What type of encryption algorithm is RSA?

## Which are key stretching algorithms?

Key Stretching Algorithms

- BCRYPT: BCRYPT is a password-hashing algorithm based on the Blowfish cipher.
- PBKDF2: PBKDF2 stores passwords with a random salt and with the password hash using HMAC; it then iterates, which forces the regeneration of every password and prevents any rainbow table attack.

The process of converting a password into a key is accomplished by a type of algorithm known as a key derivation function that may include salt and pepper with the password to make the key more difficult to guess. Overview: Key Stretching.

## What is Diffie Hellman most commonly used for quizlet?

Diffie-Hellman is the first asymmetric encryption algorithm, invented in 1976, using discrete logarithms in a finite field. Allows two users to exchange a secret key over an insecure medium without any prior secrets. Diffie-Hellman (DH) is a widely used key exchange algorithm.

## What is the biggest drawback to symmetric key encryption?

The main advantage of symmetric encryption over asymmetric encryption is that it is fast and efficient for large amounts of data; the disadvantage is the need to keep the key secret – this can be especially challenging where encryption and decryption take place in different locations, requiring the key to be moved

## Is Bcrypt a key stretching?

Bcrypt is a key stretching technique designed to protect against brute force attempts and is the best choice of the given answers. Another alternative is Password-Based Key Derivation Function 2 (PBKDF2). Both salt the password with additional bits.

## What are some methods used to strengthen a key?

One way to use a stronger type of encryption using this weak key is to send it through multiple processes. So you might hash a password, and then hash the hash of the password, and then hash the hash of the hash of the password, and so on. This is called key stretching or key strengthening.

## What is a secret algorithm?

A cryptographic algorithm that uses the same secret key for its operation and, if applicable, for reversing the effects of the operation (e.g., an HMAC key for keyed hashing, or an AES key for encryption and decryption). Also known as a secret-key algorithm.

## What is lightweight cryptography?

Lightweight cryptography is an encryption method that features a small footprint and/or low computational complexity. It is aimed at expanding the applications of cryptography to constrained devices and its related international standardization and guidelines compilation are currently underway.

## Is a key exchange algorithm that enables two user to securely exchange a key that can then be used for subsequent symmetric encryption of messages?

– The purpose of the algorithm is to enable two users to securely exchange a key that can then be used for subsequent symmetric encryption of messages. -The algorithm itself is limited to the exchange of secret values.

## Which of the following is not a hashing algorithm?

DES is an encryption algorithm, not a hashing algorithm. HAVAL is a one-way hashing algorithm is a deterministic algorithm that compresses an arbitrarily long message into a value of specified length.

## What is RSA algorithm in cryptography?

The RSA algorithm is an asymmetric cryptography algorithm; this means that it uses a public key and a private key (i.e two different, mathematically linked keys). As their names suggest, a public key is shared publicly, while a private key is secret and must not be shared with anyone.

## What is DES algorithm in cryptography?

The DES (Data Encryption Standard) algorithm is a symmetric-key block cipher created in the early 1970s by an IBM team and adopted by the National Institute of Standards and Technology (NIST). The algorithm takes the plain text in 64-bit blocks and converts them into ciphertext using 48-bit keys.

## What type of encryption algorithm is RSA?

RSA algorithm is asymmetric cryptography algorithm. Asymmetric actually means that it works on two different keys i.e. Public Key and Private Key. As the name describes that the Public Key is given to everyone and Private key is kept private.