Creating a CMK involves several steps: 1. Define Data Sources: Identify where your customer data is coming from – CRM systems, email lists, social media, etc. 2. Data Integration: Use data integration tools to merge data from various sources into a single database. 3. Unique Identifier: Assign a unique identifier to each customer. This could be an email address, phone number, or a system-generated ID. 4. Data Cleaning: Ensure that the data is clean and free of duplicates. Use data cleaning tools to normalize your data. 5. Encryption: Use encryption techniques to protect the data associated with each CMK.