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Q1) Let DES(x, K) represent the encryption of plaintext x with key K using the DES cryptosystem. Suppose y = DES(x, K) and y' = DES(c(x), c(K)), where c(·) denotes the bitwise complement of its argument [i.e. changing all the 1's to 0's and all the 0's to 1's. For example, if t = 10000110, then c(t) = 01111001; equivalently, c(t) = t ⊕ 11111111]. Prove that y' = c(y) (i.e., if we complement the plaintext and the key, then the ciphertext is also complemented).
Research three web browsers. For each browser, try to use it to at least access, if not actively work with, each of the following type of common web sites.
For a language L over alphabet Sigma, let sup(L) denote language of all strings in Sigma* that contain a string of L as s substring.
The security manager is to estimate principal physical characteristics used for biometric user authentication, concepts of enrollment.
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Assume you are responsible for selecting and maintaining your current employers connection to the Internet. Take some time to research routing protocols
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Assume that we are working on a workstation with an instruction rate of 500 MIPS. How many instructions can the processor execute between the receipt of each individual bit of the message?
In terms of spectrum, does AT&T, Verizon, Sprint, etc...have access to amount of spectrum required to deliver VoIP services as well as Internet radio and TV?
Suppose a security-aware caching resolver receives DNS RRset at time t0 with signatures on it which expire at time t1 (where t0
Is Nmap able to recognize operating system running on each system? Is there any Nmap feature which can be utilized to guess OS of host?
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