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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.
The keys which EFS uses to encrypt and decrypt data, is a public and private key pair, and a per file encryption key. EFS generates a file encryption key (FEK) which is a symmetric encryption key to encrypt the data. The File Encryption Key (FEK) is next encrypted by means of asymmetric encryption using the userâs public key. Asymmetric encryption actually uses a public and private key pair for stronger security.