Digital forensic Coursework Example | Topics and Well Written Essays - 1500 words

Digital forensic - Coursework Example So, digital forensic has become very essential and in fact a part of the overall security perspective of any computer based industry, in spite of various challenges associated with the digital forensic investigation process. The increased use of Skype is resulting in increased number of cyber crimes as the users take advantage of the anonymity associated with its use. But with the aid of apt digital forensic tools, valuable evidences can be retrieved and it can reveal the defendant’s activities. This report will discuss about the various available tools that will aid the digital forensic investigation process, document the steps involved in the investigation process along with the challenges that has to be faced during the course of the investigation process. The artifacts collected from a Skype conversation can be analysed with the help of several investigation tools like ‘Skype chat carver’, ‘Belkasoft Evidence Center’, ‘Chat Examiner’, ‘Epilog’, ‘Forensic Assistant’, ‘Internet Evidence Finder’, ‘Skype Extractor’, ‘SkypeAlyzer’, ‘SkypeLogview’, and others (Mikhaylov 2013). It is very important to know where and how to recover the evidences like calls, messages, contacts, file transfers, and voicemails from a user’s accounts in order to utilize the above mentioned tools in the forensic analysis process. The steps stated below will help in the evidence recovery process. There are four users who use Skype application in this example. The file named ‘shared’ is a XML file which contains the main configuration information like time of usage, IP address, and other useful information. Exploring the ‘shared’ file one can retrieve the Unix style time stamp information (Shaw 2014). Here comes the first challenge. This Unix style time stamp information is displayed in a coded format as a string of numbers, which has to be converted to

Investigate shear transfer in bolted members Essay

Investigate shear transfer in bolted members - Essay Example Similarly, â€Å"the stresses at the yield point of the thread, based on the area at bottom of thread, when nuts were screwed on without tightening down by spanner against the bolts tightened by spanner, had reduction of 20 percent†. It is important to understand that the failure of bolt is the characteristics of the minimum residual stresses of the bolt material. During an exercise, consistent stresses were derived for ordinary black, and turned and fitted bolts upon their respective failure. As per Peter (1950) experimentation, â€Å"the yield point of thread, however in the case of the black bolts was approximately 30 percent, which is lower than yield point obtained for turned and fitted bolts†. It is important to specify that in all the failures the damage initiated from the root of the thread, however there were instances when the threads stripped. It has been experimental proven by Peter (1950) that the â€Å"strength of a bolt in direct tension is greatly affected by the amount of initial tension induced when the nuts were made spanner tight; this is a factor which is uncontrollable from design perspective. The strength is dependent upon resistance of the threads against stripping†. It is practically concluded that, â€Å"most of the stress on the threads will be shear as the tendency in screwing up will be to force the threads off the bolt or nut in a direction parallel to the axis i.e. circumferential due to the friction between the adjacent threads†. Peter (1950) has noted that â€Å"when considering the allowable unit stress which may safely be adopted the probability that some of the stock bolts may be wrought iron, instead of mild steel† must not be ignored. The bolts which assist in the hanging of the runways are exposed to direct tension. It is therefore recommended that conservative approach shall be adopted, with specific reference to the determination of the safe loads for these bolts. We shall