Disk utility not responding

In the Disk Utility app on your Mac, choose View > Show All Devices. In the sidebar, select the volume you want to restore, then click the Restore button . This is the volume that is erased and becomes the exact copy. Click the Restore pop-up menu, then choose the volume you want to …

Data encryption algorithm

A personal encryption key, or name, known only to the transmitter of the message and its intended receiver, is used to control the algorithm’s encryption of the data, thus yielding unique ciphertext that can be decrypted only by using the key. Since the late 1970s, two types of encryption have emerged.