Cryptography Reference
In-Depth Information
to capital letters before generating the key in the software. How long does an
average key search take with a single PC?
3.13.
This problem deals with the lightweight cipher PRESENT.
1. Calculate the state of PRESENT-80 after the execution of one round. You can use
the following table to solve this problem with paper and pencil. Use the following
values (in hexadecimal notation):
plaintext =
0000 0000 0000 0000
,
key =
BBBB 5555 5555 EEEE FFFF
.
Plaintext
0000 0000 0000 0000
Round key
State after KeyAdd
State after S-Layer
State after P-Layer
2. Now calculate the round key for the second round using the following table.
Key
BBBB 5555 5555 EEEE FFFF
Key state after rotation
Key state after S-box
Key state after CounterAdd
Round key for Round 2
