Question 4) Cert-XK0-002 – CompCert: Linux+

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Objective : Security
SubObjective : Given security requirements, implement appropriate encryption configuration

Single Answer Multiple Choice

 

Which encryption algorithm is defined in the Wi-Fi standards for wireless LANs?

 

 

  1. AES
  2. WEP
  3. 3DES
  4. Blowfish

 

 

 

Answer:
B. WEP

Tutorial:
The Wired Equivalent Privacy (WEP) protocol is defined in the Wi-Fi standard for wireless LANs. The Wi-Fi standard, previously known as the 802.11 standard, was formulated by the Institute of Electrical and Electronics Engineers (IEEE). The Wi-Fi standard was developed to evolve the wired Ethernet conforming to the 802.3 standards to the wireless world. To provide a secure data transmission to wireless LAN (WLAN), the WEP protocol is used to encrypt the data before transmission.

The Advanced Encryption Standard (AES) is not defined in the Wi-Fi standards. AES is a symmetric-key cryptography algorithm that ciphers a block length of 128 bits by using a key length of 128, 192, or 256 bits. The AES cryptographic technique is based on the Rijndael algorithm and is recognized by the US government as its official encryption technology. A symmetric-key cryptography algorithm is a mechanism in which a single key is used to encrypt and decrypt a message. The transfer of the key from the sender to the receiver over the network is a security threat because the network is prone to unauthorized access. The Triple Data Encryption Standard (3DES) is not defined in the Wi-Fi standards. The 3DES algorithm uses the Cipher Block Chaining (CBC) technique while encryption. The 3DES algorithm is a cryptographic algorithm that encrypts a block of data three times by using a different 168-bit key each time. The 3DES algorithm is an advanced version of the DES algorithm.

The Blowfish algorithm is not defined in the Wi-Fi standards. The Blowfish algorithm uses the CBC technique while encryption. The Blowfish algorithm is a symmetric encryption algorithm that encrypts a 64-bit block of data by using a key length ranging between 32 and 448 bits.

The WLAN requires the configuration of access points for the transmission of radio signals. There are various programs available to manage the configuration of access points on a WLAN. On a Linux system, these programs can be executed using terminal emulators, such as Wine Is Not an Emulator (WINE). WINE is a software program used to run Windows programs on Linux or UNIX systems.

 

Reference:
WEP, http://www.webopedia.com/TERM/W/WEP.html
802.11, http://www.webopedia.com/TERM/8/802_11.html

 

These questions are derived from the Transcender Practice Test for the CompTIA Linux+ certification exam.

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