<prompt> I-EFS isebenza ngokubethela ifayela ngekhiphedi ye-bulk symmetric key eyaziwa nangokuthi i-File Encryption Key, noma i-FEK, esetshenziswa ngoba kuthatha isikhathi esincane ukubethela nokuqaqa inani elikhulu ledatha kunokuthi uma kusetshenziswa i-asymmetric key cipher. Ikhiphedi ye-symmetric key esetshenziselwa ukubethela ifayela bese ibethelwa ngekhiphedi ye-public key ehambisana nomsebenzisi obethele ifayela, futhi le datha ebethelwe ibethelwa kwenye i-encrypted alternate of the encrypted file stream. Nokho, i-EFS isebenza ngokubethela ifayela ngekhiphedi ye-bulk symmetric key eyaziwa nangokuthi i-File Encryption Key, noma i-FEK, esetshenziswa ngoba kuthatha isikhathi esincane ukubethela nokuqaqa inani elikhulu ledatha kunokuthi uma kusetshenziswa i-asymmetric key cipher.  <response>: okhiye abengeziwe bokuvula 