With EFS, we must have a private key in order to access the encrypted file. If it was encrypted with a public key, we have to use the private to decrypt it. If the file or folder was encrypted with the private key, we have to use the public key to decrypt it. In an asymmetrical system, we basically encrypt files or folders with either a public or private key. These can be trusted third-party certificates, or they can be self signed certificates. Certificates (keys) are used to manage access to files. EFS uses both symmetric and asymmetric cryptography. To implement Encrypting File System (EFS) we have to use NTFS file system on our volumes (EFS is a feature of NTFS). So, anything that we encrypt with the public key can only be decrypted with the private key. The Private key is kept in the users private certificate store. Users can use the public key to encrypt data and the Private key to read the encrypted data. One is a Public key which is stored in the certificate, and a Private key. This process is known as a Public Key Encryption (PKI). These encrypted files can then only be used by using a private key that the user who encrypted the files has access to. Key terms: file, encrypted, key, files, recovery, private, computer, agent, encrypt, access, efs, encryptionĮFS enables us to encrypt files and folders using a public encryption key tied to a specific user. Prerequisites: you should know what is encryption. Objectives: Learn what is Encrypting File System and why should we use this feature in Windows OS.
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