Q3)A well known authentication technology requires users to enter a user ID and 10-digit code to log in. The first 4 digits of the code were chosen by the user when setting up the account, and the last 6 digits are shown on a physical token given to the user by an administrator. State the number of authentication factors used in this scenario, and for each factor state the type of factor and briefly describe the data corresponding to that factor. (2 points)
Q4. In the PHP function password_hash , the default algorithm is brcypt which produces a text string derived from a 16-byte “salt” value and a 24-byte salted hash of the supplied password. How many entries would be needed in a “rainbow table” that included all possible salt values and all possible salted hash values? Show your calculations. (2 points)
Q5. On Lecture 7 slide 56 (Kerberos – Version 4 dialog), the first field under Message 2 is EKc . Briefly explain how the key used to encrypt/decrypt data between the user’s client and the Authentication Server is generated. (2 points)
Q6. State the minimum and maximum possible values for the lifetime of a ticket in Kerberos Version 4. Show your calculations. Note: A lifetime of 0 is valid but not useful as the ticket expires before it can be used – calculate the minimum useful value.
ation out of the 167 nations that were surveyed. Inadequate Infrastructure Despite the efforts made to improve infrastructure in Nigeria, Mr Tony Elumelu and other Nigerian Africapitalists believe that there is much more that can be done. Load shedding or intermittent power outages is still a prominent problem that hinders many businesses in rural areas from operating efficiently and effectively. The limited number of innovation hubs hinder further processing of creative innovations. Other infrastructures such as roads slow down transportation of goods across the country which in turn slows down economic growth within Nigeria. In short, distribution channels for products to the customers is generally affected when the road networks are not well maintained. Distribution of supplies to remote schools and health facilities become a challenge. High Government Maintenance Cost High ranking government officials in Nigeria allocate themselves more money per ministry than the government budget allocated. This in turn leaves the government bank balance in huge deficits. Under the the administration of former President Goodluck Jonathan, the Nigerian military was allocated funds of roughly 2 billion USD to purchase weapons, however it was later discovered that high ranking army officials split the funds amongst themselves. Some of the army officials were arrested for these actions however this is only one of the many cases of over supply of budget in government ministries. Such acts of exploitation put the citizens of Nigeria at the risk of exposure to poverty. Figure 4: Graph showing the increase in government spending Source: http://www.imf.org/external/country/ Despite the increase in the Nigerian government’s revenue, as seen above it is evident that the Nigerian government is spending more than it is making therefore leaving the government’s account balance in a deficit. Internal Conflicts At the moment, Nigeria is facing many internal issues such as terrorist organisations and tribalism. Nigeria consists of many ethnic groups with the two biggest ethnic groups in terms of population size and political power being, Hausas and Yorubas. Currently there are many economic conflicts between the two ethn>GET ANSWER