Which of the following encryption algorithm is used by Wired Equivalent Privacy (WEP)?

Question

Options

• ARC4
• BRSA
• CIDEA
• DSHA

• A
  78% (38)
• B
  6% (3)
• C
  4% (2)
• D
  12% (6)

Explanation

The RC4 encryption algorithm is used by Wired Equivalent Privacy (WEP). Wired Equivalent Privacy (WEP) is a security protocol for wireless local area networks (WLANs). It has two components, authentication and encryption. It provides security, which is equivalent to wired networks, for wireless networks. WEP encrypts data on a wireless network by using a fixed secret key. WEP incorporates a checksum in each frame to provide protection against the attacks that attempt to reveal the key stream. Answer option D is incorrect. The Secure Hash Algorithm (SHA) is a cryptographic hash algorithm. It generates a fixed-length digital representation (message digest) of an input data sequence of any length. The SHA algorithm is very secure, as it is computationally very difficult to find a message that corresponds to a given message digest. In this algorithm, any change to a message will result in a completely different message digest. There are five SHA algorithms: SHA-1, SHA- 224, SHA-256, SHA- 384, and SHA-512. Answer option B is incorrect. The RSA algorithm is an example of the public key algorithm in which the public key is generated from the private key. In the RSA algorithm, public and private keys are generated as follows: 1. Choose two large prime numbers p and q of equal lengths, and compute n=pq. 2. Choose a random public key e such that e and (p-1)(q-1) are relatively prime. 3. Calculate ed=1mod[(p-1)*(q-1)]. Here, d is a private key. 4. Calculate d=e^(-1)mod[(p-1)(q-1)]. 5. Now (e,n) and (d,n) are the public and private keys respectively. Answer option C is incorrect. International Data Encryption Algorithm (IDEA) is a block cipher. IDEA operates on 64-bit blocks using a 128-bit key. This algorithm was intended as a replacement for the Data Encryption Standard. IDEA was used in Pretty Good Privacy (PGP) v2.0, and was incorporated after the original cipher used in v1.0 was found to be insecure. It is an optional algorithm in OpenPGP. The cipher is patented in a number of countries but is freely available for non- commercial use. IDEA is a minor revision of an earlier cipher, PES (Proposed Encryption Standard). It was originally known as IPES (Improved PES).

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