Wireless Security

Question 1

Defense against digital dark arts
Video link: https://youtu.be/Ug5DZcF2NvY


What are some of the weaknesses of the WEP scheme? Check all that apply. 

1 / 1 point

Its use of ASCII characters for passphrases 

Its use of the RC4 stream cipher 

Correct

You nailed it! The RC4 stream cipher had a number of design flaws and weaknesses. WEP also used a small IV value, causing frequent IV reuse. Lastly, the way that the encryption keys were generated was insecure.

Its poor key generation methods

Correct

You nailed it! The RC4 stream cipher had a number of design flaws and weaknesses. WEP also used a small IV value, causing frequent IV reuse. Lastly, the way that the encryption keys were generated was insecure.

Its small IV pool size 

Correct

You nailed it! The RC4 stream cipher had a number of design flaws and weaknesses. WEP also used a small IV value, causing frequent IV reuse. Lastly, the way that the encryption keys were generated was insecure.

Question 2

What symmetric encryption algorithm does WPA2 use? 

1 / 1 point

DES

AES

DSA

RSA

Correct

Great work! WPA2 uses CCMP. This utilizes AES in counter mode, which turns a block cipher into a stream cipher.

Question 3

How can you reduce the likelihood of WPS brute-force attacks? Check all that apply. 

1 / 1 point

Implement lockout periods for incorrect attempts.

Correct

Exactly! Ideally, you should disable WPS entirely if you can. If you need to use it, then you should use a lockout period to block connection attempts after a number of incorrect ones.

Disable WPS.

Correct

Exactly! Ideally, you should disable WPS entirely if you can. If you need to use it, then you should use a lockout period to block connection attempts after a number of incorrect ones.

Use a very long and complex passphrase.

Update firewall rules.

Question 4

Select the most secure WiFi security configuration from below: 

1 / 1 point

None

WEP 128 bit

WPA2 personal

WPA enterprise

WPA2 enterprise

WPA personal

Correct

Exactly right! WPA2 Enterprise would offer the highest level of security for a WiFi network. It offers the best encryption options for protecting data from eavesdropping third parties, and does not suffer from the manageability or authentication issues that WPA2 Personal has with a shared key mechanism. WPA2 Enterprise used with TLS certificates for authentication is one of the best solutions available.

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