This is a cryptographic hash of the password generated with the SHA256 function. The way encryption works in these drives is that a user-selected password is used to create a key encryption key (KEK). Due to implementation differences between the different chips, the discovered security issues varied from device to device, but they were all serious, the researchers said in a recently released paper. The researchers tested WD external drive models with six different USB bridges from JMicron Technology, Symwave, Initio and PLX Technology. In other cases the encryption is done by the HDD's own SATA controller, with the USB bridge handling only the password validation. In some cases they found that the encryption is performed by the chip that bridges the USB and SATA interfaces.
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