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NEW QUESTION 22 Which of the following is assured by the use of a hash?

• A. Integrity
• B. Availability
• C. Confidentiality
• D. Authentication

Answer: A Explanation: Integrity https://en.wikipedia.org/wiki/Cryptographichashfunction#Verifyingtheintegrityofmessagesandfiles An important application of secure hashes is verification of message integrity. Comparing message digests (hash digests over the message) calculated before, and after, transmission can determine whether any changes have been made to the message or file.   NEW QUESTION 23 In 2007, this wireless security algorithm was rendered useless by capturing packets and discovering the passkey in a matter of seconds. This security flaw led to a network invasion of TJ Maxx and data theft through a technique known as wardriving. Which Algorithm is this referring to?

• A. Wired Equivalent Privacy (WEP)
• B. Wi-Fi Protected Access (WPA)
• C. Wi-Fi Protected Access 2 (WPA2)
• D. Temporal Key Integrity Protocol (TKIP)

Answer: A Explanation: Wired Equivalent Privacy (WEP) https://en.wikipedia.org/wiki/WiredEquivalentPrivacy#Weak_security In 2007, Erik Tews, Andrei Pychkine, and Ralf-Philipp Weinmann were able to extend Klein's 2005 attack and optimize it for usage against WEP. With the new attack it is possible to recover a 104-bit WEP key with probability 50% using only 40,000 captured packets. For 60,000 available data packets, the success probability is about 80% and for 85,000 data packets about 95%. Using active techniques like deauth and ARP re-injection, 40,000 packets can be captured in less than one minute under good conditions. The actual computation takes about 3 seconds and 3 MB of main memory on a Pentium-M 1.7 GHz and can additionally be optimized for devices with slower CPUs. The same attack can be used for 40-bit keys with an even higher success probability.   NEW QUESTION 24 What advantage do symmetric algorithms have over asymmetric algorithms

• A. It is easier to implement them in software
• B. They are more secure
• C. They are faster

Answer: C Explanation: D It is easier to exchange keys Explanation: They are faster Symmetric key encryption is much faster than asymmetric key encryption, because both the sender and the recipient of a message to use the same secret key.   NEW QUESTION 25 ......