This question was previously asked in

MPPSC General Studies 2020 Official Paper

Option 1 : Symmetric Encryption Algorithm

The correct answer is the **Symmetric Encryption Algorithm.**

__Key Points__

**Blowfish: **

- Blowfish is the
**first symmetric encryption algorithm**created by**Bruce Schneier in 1993. Hence statement 1 is correct.** - The
**sensitive data and the symmetric encryption key**are utilized within the encryption algorithm to turn the sensitive data into ciphertext. - Blowfish, along with its successor
**Twofish,**was in the running to replace the**Data Encryption Standard (DES)**but failed due to the small size of its block. - Blowfish uses a
**block size of 64,**which is considered wholly insecure. Twofish fixed this issue, by implementing a**block with a size of 128.**

**Symmetric algorithm:**

- The symmetric algorithm is a set of instructions in cryptography that
**use one key to encrypt and decrypt data.** - This is the simplest kind of encryption that involves
**only one secret key**to cypher and decipher the information. - Symmetric encryption is an
**old and best-known technique**. It uses a secret key that can either be a number, a word or a string of random letters.