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The tutorial explains using the JSON Web Encryption (JWE) standard to encrypt a purchase order during web checkout. It highlights the npm package for JSON object signing and encryption, noting that JWE enables standardizing the packaging of data meant for encryption, so that the decryption process knows the algorithm used. The tutorial also mentions utilizing the "dotenv" package to manage environment variables in a .env file, where public and private keys will be stored. If the .env file lacks keys, the tutorial instructs on creating them. It covers generating symmetric key pairs using a function that requires an algorithm identifier. This process ensures secure key management and encryption for the purchase order.