EFS uses a combination of private and public key encryption for securing a user's data.

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Quizplus · Accepted Answer

EFS (Encrypting File System) does indeed use a combination of both private and public key encryption to protect the files and folders on a user's system. The user's files are encrypted with a unique file encryption key (FEK), which is itself encrypted with a public key that is stored in the user's certificate. When the user wants to access their files, they use their private key to decrypt the FEK and access the files. This makes it very difficult for anyone without the proper credentials to access the user's data.

EFS Uses a Combination of Private and Public Key Encryption