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Encryption is the process of transforming information in such a way that an unauthorized third party cannot read it; a trusted person can decrypt data and access it in its original form though. There are a lot of popular encryption/decryption methods, but the key to security is not a proprietary algorithm.
A Framework for Protecting Data Keys with Master Keys. The AWS Encryption SDK protects the data keys that encrypt your data by encrypting them under one or more master keys. By providing a framework to encrypt data keys with more than one master key, the Encryption SDK helps make your encrypted data portable.