$1.$ Let Block be a block cipher consisting of two rounds of a Feistel cipher having block length $8$ with the session keys k$1$ and k$2$ such that k$=$k$1||$k$2$ be the secret key. Suppose the complex function F used in the Feistel cipher is simple XOR with the session key. F $($m$,$ k$)=$ m XOR k for input string m and session key k$.$ Find the ciphertext Block $($m$,$ k$)$ where the message m $=10100101$ and the secret key k is $11001010.$