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Scenario: ZYZ Company in Oman has computer and mobile applications for which they desire to apply different security standards for the different modules of the applications. The company needs Python code at various levels, which are given in Part-A. Hence, they can easily adapt to their application.

1. The company requires encryption and decryption using playfair substitution steps, as well as Python code implementation. The plaintext and key are up to you, but the plaintext size should be at least 8 letters, and the key length should be at least 6 letters.

The company requires encryption and decryption for affine substitution steps, implementing the code in Python. The plaintext and key are up to you, but the plaintext and the key length should be at least 6 letters.

3. The company expects you to provide the steps to use Python to add a watermark to employee photos. Provide the python source code and the sample image used.

4. In addition, the company would like you to recommend three cryptographic standards that work with its algorithm for future enhancement by using the following.