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Q1) Consider an improved version of the Vigenere cipher, where instead of using multiple shift ciphers, multiple mono-alphabetic substitution ciphers are used. That is, the key consists of t random permutations of the alphabet, and the plaintext characters inpositions i; t+i; 2t+i, and so on, are encrypted using the ith permutation. Show how to break this version of the cipher.
Suppose a security-aware caching resolver receives DNS RRset at time t0 with signatures on it which expire at time t1 (where t0
As security manager at XYZ Corporation, you are responsible for managing intrusion detection environment. If you were given the ability to build the environment from scratch, would you use network based IDS, host based IDS, or a combination?
Explain to your team the differences between routers and switches. Compare them and list the pros and cons of using each type of hardware.
Social Networking is one of the hottest topics in knowledge management. Is it knowledge management?
Assume that sender sends silence suppressed RTP stream of G.711 audio to receiver (G.711 is the name of standard for 64Kbps PCM). Outline algorithm which uses sequence numbers and time stamps of RTP packets to find out beginning of new talk spurt?
Assume that sender sends silence suppressed RTP stream of G.711 audio to receiver. During talk spurt 20 msecs chunks of quantized audio samples are encapsulated. Determine number of samples are included in each packet?
In Lamport'so mutual exclusion protocol, if process i is implementing critical section, Is this still true when there are no messages in transit?
In using wireless networking and WEP enabled phone, how is security important? would you trust the methods that exist today to secure these technologies?
If IPSec gives security at network layer, why is it that security mechanisms are still require at layers above IP?
You are requested to upgrade bus topology LAN at a friend's house to a star topology LAN. your friend wishes to connect three computers.
Describe Quality of Service (QoS) and explain the motivation behind QoS Referring to the diagram below, configure Routers 1, 2, and 4 with Internet Protocol (IP) addresses, and ping between them to test connectivity. Write down complete commands..
Write down the analogous steps in dimensioning a computer network?
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