Modify the algorithm to rectify the above problem

Assignment Help Basic Computer Science

Reference no: EM13298031

3. Consider a simple symmetric encryption algorithm as follows:
1- Input text T and 64 bit key K
2- Divide T into 64 bit size blocks B1...Bn
3- Get first block B1 and perform bit-wise XOR with K to
produce encrypted block E1
4- Repeat
a. Get next block Bi and perform bit-wise XOR with Ei-1
to produce encrypted block Ei
5- Until End of Text
Page 3 of 4
The algorithm is very simple, and naturally, we do not expect the ciphertext to be
cryptographically strong. Given the above algorithm answer the following:
a. Is it a problem if the first block of input happens to be the same as the key?
Explain why?
b. Modify the algorithm to rectify the above problem.

Reference no: EM13298031

Questions Cloud

Needs to manage its telecommunications costs more effective : The retail store knows that it needs to manage its telecommunications costs more effectively. Based on the owner's goals to maximize the Internet for this purpose, provide a solution that will support the telecommunications (phone and fax) nee..

What is the moment of inertia of the merry-go-round : The radius of a park merry-go-round is 2.4 m. To start it rotating, you wrap a rope around it and pull with a force of 260 N for 11 s. What is the moment of inertia of the merry-go-round

What caused your perception to change : What is a perception you have had of another culture that has changed? What caused your perception to change? How might values of different peoples become more alike the more they interact with one another?

How to calculate the concentration of h3o+ of the solution : A 0.010 M HCN solution is .020% ionized. Calculate the concentration of H3O+ of this solution. Please show work and solution.

Modify the algorithm to rectify the above problem : Modify the algorithm to rectify the above problem.

What is global income in 2010 : Suppose that they have no other income, interest expenses are unchanged, and taxes are the same percentage of pretax income as in 2009.

Define flow at a hydraulic jump in terms of flow : Define flow at a hydraulic jump (upstream and downstream) in terms of the types of flow and corresponding Froude number. What is the depth of water at each section (upstream and downstream) compared to critical depth

How large a check could be written without it bouncing : At the present time, how large a check could be written without it bouncing? Round your answer to the nearest hundredth of million, if necessary.

Explain single carbon-carbon bonds represent potential : The polyyne molecules CkH2 with alternating triple and single carbon-carbon bonds represent potential nanowires for molecular electronics. They can be modelled as linear 1D-boxes with 2k

User Account

All Pages