KENYA METHODIST UNIVERSITY BBIT 242 TELECOMMUNICATION NETWORKS OKWACHI OJIAMBO NICHOLAS BIT-1-4628-3/2012 1. PSTN refers to a Public Switched Telephone Network. It carries phone traffic between PBX devices and is based on circuit switching, while PSDN refers to a Public Switched Data Network that carries data traffic between company networks and across the internet1.Public Switched Telephone Network is the normal telephone network, based on circuit switching while Packet Switched Data
Words: 1193 - Pages: 5
{F ( s )} 1. 3. 5. 7. 9. 11. 1 t n , n = 1, 2,3,K t sin ( at ) t sin ( at ) sin ( at ) - at cos ( at ) cos ( at ) - at sin ( at ) sin ( at + b ) sinh ( at ) e at sin ( bt ) e at sinh ( bt ) t ne at , n = 1, 2,3,K uc ( t ) = u ( t - c ) Heaviside Function F ( s ) = L { f ( t )} 1 s n! s n +1 Table of Laplace Transforms f ( t ) = L -1 {F ( s )} F ( s ) = L { f ( t )} 1 s-a G ( p + 1) s p +1 1 × 3 × 5L ( 2n - 1) p 2n s 2 s 2 s + a2 s2 - a2 2 n+ 1 2. 4. 6. 8. 2 e at t p , p > -1 t
Words: 594 - Pages: 3
software, people, policies, and procedures needed to create, manage, distribute, use, store, and revoke digital certificates. 4. Does a hash function ensure integrity or privacy? Explain your answer. Pg.309/310. Hash functions help to detect forgeries. They compute a checksum of a message and then combine it with a cryptographic function so that the result is tamperproof. Hashes are usually of a known fixed size based on the algorithm used. A hash is a checksum designed so that no one
Words: 363 - Pages: 2
is a Chosen-prefix collision attack: Much like symmetric-key ciphers are vulnerable to brute force attacks, every cryptographic hash function is inherently vulnerable to collisions using a birthday attack. Due to the birthday problem, these attacks are much faster than a brute force would be. A hash of n bits can be broken in 2n/2 time (evaluations of the hash function). Using a Cisco ASA that utilizes hash cryptography for verification of file integrity is susceptible to a brute force or dictionary
Words: 313 - Pages: 2
Basically the workings of the MD5 is MD5 will process block 512 bits, then divide it into 16 subblok size of 32 bits. Algorithm output is set into 4 blocks, each measuring 32 bits after combinea will form a 128-bit hash value. One of the problems that will occur is the collision. There are two or more text that produce the same hash value. In this case the MD5 inputs along regardless, will produce along the 128-bit hash value. That means very many input possibilities, infinite, but probably only
Words: 811 - Pages: 4
Introduction The AIC triad is one of the many approaches to secure networks in today's complex computing environments. What makes the AIC triad different from any other theory is that when it is used properly it forms the cornerstone of every aspect of computing and network security. Most IT security practices are focused on protecting systems from loss of confidentiality, loss of integrity, and loss of availability; these three together are referred to as the security triad, the CIA triad, and
Words: 1508 - Pages: 7
STAT 2606 Assignment # 3 Fall 2013 Last Name ——————————————- , Student # ———————— Lab section (Important) ———————– Due in class: Tue. Nov. 12 First ———————- Total mark=100. Marks for each question are given in [ ] Part I. Lab questions. Use only blanks left to answer lab questions. Provide all histograms you are asked to print, but DO NOT print data you are asked to generate. 1. Continuous distributions: Generate and store in column c1 10,000 values from the uniform distribution on
Words: 1278 - Pages: 6
Explain and demonstrate the relationship between supply and demand for Mrs. Acres Homemade Pies. Shelly can supply 2000 pies each month for $4.5 each, netting $1.5 profit per pie with three part-time employees, however the demand is higher than what she can do, so eventually Shelly expanded her operations, borrowing money and increasing staff to four full-time employees. The production time increase to 8000 pies per month with profit soared to $12,000 per month. As per the chart showed
Words: 438 - Pages: 2
considered (probability) density functions. We went on to discuss their relationship with cumulative distribution functions. The goal of this section is to take a closer look at densities, introduce some common distributions and discuss the mean and median. Recall, we define probabilities as follows: Proportion of population for Area under the graph of p ( x ) between a and b which x is between a and b p( x)dx a b The cumulative distribution function gives the proportion of the population
Words: 1914 - Pages: 8
wait for repair services on JET’s copier. To model the probability of wait times in the JET Copies simulation, the JET partners generated a random number representing the probability of an occurrence of a breakdown. They then programmed a VLOOKUP function to match this breakdown probability to the corresponding “Repair Time in Days” column of the table. The result is the simulated time to get repair service for each breakdown occurrence. Interval between breakdowns The James, Ernie, and Terri
Words: 862 - Pages: 4
