Similar to the requirements from the previous recipe, there might be a need to mask data before saving it in DynamoDB. Masking is replacing real data with realistic data for sensitive information, such as names, dates of birth, Social Security number (SSN), credit/debit card numbers, and so on. Generally, when it comes to the security of testing data, people prefer masking over encryption. In this recipe, we will see how to mask such data before saving it in DynamoDB.