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System encryption of Win 10 AU with new Serpent algorithm extremely slow

Topics: Technical Issues
Nov 29, 2016 at 10:56 AM
Edited Nov 29, 2016 at 11:20 AM
I've recently encrypted the WIndows 10 AU (v1607) system partition (actually the whole disk) of my old notebook with VeraCrypt 1.19.

I've did some benchmarking with VeraCrypt beforehand, and since that CPU doesn't have AES support (Core 2 Duo, 2.5 GHz, no UEFI), the new, assembly-based Serpent algorithm turned out to be the fastest on that system. Yay.

So I've encrypted the system with Serpent and SHA-256.

Booting up that system after encryption turned out to be extremely slow (more than 10 minutes boot time - not the passphrase verification in the bootloader, but the booting of Windows itself). After a couple of reboots with the same result, I've decrypted the disk and re-encrypted it with AES/SHA-256. Result: Several times faster.

I'm fine with AES right now, and just like to point out this issue to the developers.