Which is the first algorithm known to be suitable for signing as well as encryption and one of the first great advances in public key cryptography?

Question

Options

• A3DES
• BSEAL
• CTDE
• DRSA

• A
  5% (1)
• B
  10% (2)
• D
  85% (17)

Explanation

RSA (which stands for Rivest, Shamir, and Adleman who first publicly described it) is an algorithm for public-key cryptography. It is the first algorithm known to be suitable for signing as well as encryption, and one of the first great advances in public key cryptography. RSA is widely used in electronic commerce protocols, and is believed to be secure. The RSA algorithm involves three steps: key generation, encryption, and decryption. Answer: C is incorrect. Transparent data encryption (TDE) performs real-time I/O encryption and decryption of the log and data files. It makes use of a database encryption key (DEK), which is stored in the database boot record for availability during recovery. It gives the ability to abide by many laws, regulations, and guidelines established in various industries. This facilitates software developers to encrypt data by using AES and 3DES encryption algorithms without changing existing applications. Answer: A is incorrect. 3DES, also referred to as triple DES, is a mode of the Data Encryption Standard (DES) encryption algorithm. 3DES uses three 64-bit keys to encrypt data thrice. Primarily, it encrypts data with a 64-bit key. Then, the output data is again encrypted with the second 64-bit key. Finally, the third 64-bit key is used for encryption. DES uses the block cipher method to break a data file into 64-bit blocks, which are then encrypted. Answer: B is incorrect. SEAL is an alternative encryption algorithm to software-based DES, 3DES, and AES. It uses a 160-bit encryption key. SEAL provides less impact to the CPU than other software-based encryption algorithms. In Cisco IOS IPSec implementations, SEAL supports the SEAL algorithm. It can be configured through the command-line interface using the crypto ipsec transform-set command and the esp-seal transform option.

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