Question: 1 . Consider a very simple symmetric block encryption algorithm in which 3 2 - bits blocks of plaintext are encrypted using a 6 4

1. Consider a very simple symmetric block encryption algorithm in which 32-bits
blocks of plaintext are encrypted using a 64-bit key. Encryption is defined as:
C=(Po+K0)K1
Where C ciphertext, K secret key, K0 leftmost 32 bits of K,K1 rightmost
32 bits of K,o+ bitwise exclusive OR, and is addition mod264.
a) Show the decryption equation. That is, show the equation for P as a function of C,K0,
and K1.
b) Suppose an adversary has access to two sets of plaintexts and their corresponding
ciphertexts and wishes to determine K. We have the two equations:
C=(Po+K0)K1; and
C'=(P'o+K0)K1
First, derive an equation in one unknown (e.g.,K0). Is it possible to proceed further to
solve for K0?
1 . Consider a very simple symmetric block

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