Explaining simple symmetric encryption algorithm

Assignment Help Data Structure & Algorithms

Reference no: EM1355789

Q1) 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. The algorithm is very simple, and naturally, we do not expect the cyphertext 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: EM1355789

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