The decryption key for MEGA is a unique code used to unlock files and folders shared via the platform. Because MEGA uses zero-knowledge encryption , it does not store your keys; only you or the person sharing the link has access to them. How the Decryption Key Works
: Every item on MEGA has a unique decryption key. By default, this key is included in the link you share. However, for added security, you can choose to export and send the decryption key separately
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by researchers from ETH Zurich (2022) provides a deep dive into the platform's vulnerabilities, specifically how an honest-but-curious server could potentially recover user keys. Official Developer Documentation MEGA SDK Documentation