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Step 1 . Find out the data you need to work on Use the last 3 digits of your student ID to identify the row
Step Find out the data you need to work on
Use the last digits of your student ID to identify the row that contains bit key, and plain text you need. Determine all intermediate answers and find out the ciphertext.
Last digit of your ID bit key Plain Text
Step SDES Subkeys
In Exercise# you obtain the subkeys using five steps for details of each step, please refer to the exercise notes In the table below, write down your bit key, and complete the table by determining the resulting data and subkeys.
Write your bit key:
Step Hint Resulting data Write K or K if the resulting data is a subkey leave it empty if it is not
Step Use P
Step Split and rotate...
Step Join.. and use P
Step Rotate....
Step Join...and use P
Step SDES Encryption
In Exercise# you obtain the ciphertext using fifteen steps for details of each step, please refer to the exercise notes In the table below, write down your bit plain text; complete the table by determining the resulting data and ciphertext.
Write your bit plain text:
Step Hint
Resulting data
Step Use IP
Step Split and use EP
Step XOR with a subkey...
Step Split and use S and S
Step Use P
Step Apply XOR on two sets of data
Step Join two sets of data
Step Swap...
Step Split and use EP
Step XOR with a subkey...
Step Split and use S and S
Step Use P
Step Apply XOR on two sets of data
Step Join two sets of data
Step Use IP to obtain the ciphertext
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