DES Revision

11. Construct the expansion table used in DES algorithm and expand R6 based on the information given below. 

Input to Round 7 in Hexadecimal form : AB 7F 12 DE 3A 46 F8 91 

            Write the Output after Expansion in hexadecimal form. 

3. Find the 32 bit output of the S box of DES from the information given below   

Input to round 2 in hexadecimal form:  A0  F4  9A  E9  2B  08 

6. Using DES Construct the Initial Permutation table and perform Initial permutation on the input given below: 

 

Input in HexaDecimal Form: 9A 5C 6F C1 B2 C5 5F A3 

9. Using DES Construct the Inverse Initial Permutation table and perform Inverse Initial permutation on the input given below:                                                                               

Input in HexaDecimal Form: 1A 5F 6C C5 B5 C2 5D A2 

7. For DES encryption, construct the initial permutation table and perform initial permutation on the plain text given below: 

 

Plain Text: 53 65 63 72 65 74 20 4D 

4. Using Data Encryption Standard (DES) find the 32 bit output for the S-Box from the information given below:                                                                                      

 

Input to S-Box: 5C FF 10 23 65 21 

 

Find 32 bit output of the S-Box in hexadecimal format:  

Generate the 48 bit output (in hexadecimal) using Expansion table on the given 32-bit input:  85 13 17 AA