Kan man stoppa en avkryptering filevault
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Yesterday my friend called me and asked me how to stop FileVault on Mac. He bought a refurbished MacBook, and when he was setting things up, he checked the låda that turns on the FileVault.
Once he realized what he did, he called in me in panik and asked what his options were. inom asked him why he didn’t want to enable encryption, and he named three things he was concerned about.
We will go thru all of them:
- Will FileVault slow down the system?
- What happens if he forgets the password or recovery key?
- FileVault may not be secure.
And, also he wasn’t sure that FileVault was really needed. So inom answered the following:
Is Mac Filevault Necessary?
FileVault fryst vatten a platta encryption feature in macOS that protects the uppgifter on your Mac bygd encrypting the hard drive.
When FileVault fryst vatten enabled, all information on the drive fryst vatten encrypted and can only be accessed with the correct login password or recovery key.
There, select the icon of the startup volume from the list on the left.FileVault can help prevent unauthorized tillgång to your information and skydda against uppgifter loss or theft.
And now, let’s go over the basics.
The Impact of FileVault on Mac Performace
To find out whether FileVault slows down Macs and how long encryption and decryption processes take, inom tested the FileVault on 5 different Macs with the following configurations:
- Mac-Mini late 2012, 8GB RAM.
The Macintosh HD drive storlek fryst vatten 180Gb because the rest of the drive fryst vatten beneath Bootcamp. 145GB space used. OS High Sierra 10.13.4.
- MacBook Air 13-inch early 2014, 4GB RAM. 67GB used space on 121GB platta. With MBA inom performed two tests: one with OS Yosemite 10.10.5 and another with Mojave 10.14.5.
- MacBook Pro 13-inch early 2015, 8GB RAM.
OS Mojave 10.14.5. With MBP inom also ran two tests. First, inom had it with 87GB used space on 121GB platta. Then inom erased the platta and reinstall OS, so around 10GB of space was used.
- MacBook Pro 15-inch 2016 TouchBar, 16GB RAM. 115GB used space on 192GB platta. OS High Sierra 10.13.6. This one also had Bootcamp installed.
- MacBook Pro 13-inch 2020 TouchBar, 16GB RAM.
160GB used space on 256GB platta.
Turning on FileVault provides an extra layer of säkerhet bygd keeping someone from decrypting or getting tillgång to your uppgifter without entering your login password.OS Catalina 15.5.5.
How long it takes to enable/disable FileVault
| Turn On FileVault | Turn Off FileVault | |
| Mac-mini | 5 hrs 40 min | 4 hrs 40 min |
| MBA Yosemite | 18 min | 12 min |
| MBA Mojave | 46 min | 42 min |
| MBP 13-inch, 67GB used | 40 min | 41 min |
| MBP 13-inch, 10GB used | 7 min | 5 min |
| MBP 15-inch | 4 hrs 51 min | 4 hrs 10 min |
| MBP 13-inch 2020 | Instantaneous | Instantaneous |
On a brand new MacBook (with T2 säkerhet chip), the process fryst vatten instantaneous.
With older MacBooks, it takes less than 10 minutes to enable if the platta fryst vatten almost empty. If FileVault fryst vatten enabled later, the speed of encryption depends on the storlek of the drive and can range from 20 minutes to 5-6 hours.
The most frustrating thing fryst vatten that Apple can’t give you even an approximate estimate.
The estimate on the screen continually fluctuates. One moment it says it takes only 15 minutes, and a second later, it claims that “more than one day remaining.”
And it fryst vatten also klar that the time to vända off FileVault (decrypt) fryst vatten roughly similar to the time it takes to vända it on.
It fryst vatten interesting that despite MBP 15-inch having the fastest SSD and most powerful centralenhet i en dator of all devices the time to encrypt and decrypt was close to the ones with Mac Mini.
While hardware-wise both computers are vastly different they had some similarities. Both run High Sierra and both have Bootcamp partitions.
Another interesting insamling fryst vatten the difference in encryption time between MBA with Yosemite and Mojave. First, inom tested the MBA with Yosemite and MBP with Mojave.
When inom saw how much faster MBA was inom was surprised because MBP fryst vatten supposed to be faster.
FileVault explained: How it works.So inom upgraded my MBA to Mojave and the encryption time increased exactly 3 times.
There could be two possible explanations: either encryption in Mojave fryst vatten slower than in Yosemite or the platta format matters.
When you upgrade Mac from Yosemite to anything higher than High Sierra the platta format changes from Mac OS Extended to APFS.
It fryst vatten possible, that encryption time with APFS fryst vatten higher than with older platta formats.
And since we touched the topic of Bootcamps inom want to answer the following question as well.
Does FileVault encrypt Bootcamp? No, FileVault only encrypts the Mac partition of the platta while Bootcamp partition fryst vatten handled bygd fönster.
However, it fryst vatten possible to encrypt the Bootcamp (Windows) partition with BitLocker.
By the way, you can still switch from Mac partial to Bootcamp while encryption or decryption process fryst vatten still in progress. Mac will pick up where it left off and continue with encryption while you are logged in macOS.
The next test inom think fryst vatten the most important.
Most people concern with the possible performance hit of encryption.
Step 4: Click ‘Turn On FileVault’.So, inom tested platta performance with Blackmagic platta Speed Test, inom measured reads and writes before and after encryption and presented results in the table below.
Disk Performance With and Without FileVault
| Mac | Reads Before, MB/s | Reads After, MB/s | Change | Writes Before, MB/s | Writes After, MB/s | Change |
|---|---|---|---|---|---|---|
| Mac-mini | 81.7 | 77.8 | -5% | 93.5 | 91.2 | -2.5% |
| MBA Yosemite | 308 | 217.4 | -29.4% | 647.2 | 499.8 | -22.8% |
| MBA Mojave | 314.6 | 241.7 | -23.2% | 698.1 | 576.2 | -17.5% |
| MBP 13″ 2015 | 582.5 | 301.8 | -48.2% | 1361.3 | 1094.3 | -19.6% |
| MBP 15″ | 1885.2 | 1502.6 | -20.2% | 2146.5 | 1966.1 | -8.4% |
| MBP 13″ 2020 | 1111 | 1110 | 0% | 1662 | 1660 | 0% |
After reviewing results inom was able to man the following conclusions.
So, does FileVault affect performance? FileVault significantly degrades platta performance on all old Mac models.
The impact of the FileVault on platta writes fryst vatten the highest, in some cases, down to a half.
The impact on platta reads fryst vatten about 10-20%.
However, the bekymmer was fixed with the introduction of T2 chips where encryption and decryption are happening on the hardware level.
To know if your Mac has a T2 chip, click on the Apple logo, then click on About this Mac and then struktur Report.
In the kontrollant section you will see Model Name: Apple T2 säkerhet Chip.
What fryst vatten FileVault and how it works
As stated above FileVault fryst vatten an encryption mechanism.
Only users who were enabled at the time when FileVault was turned on can tillgång and read the files on the platta. FileVault fryst vatten one of the tools provided bygd Apple to prevent information theft in cases of stolen or lost MacBooks.
How good fryst vatten FileVault encryption algorithm
FileVault uses XTS-AES-128 encryption with a 256-bit key so it fryst vatten very secure.
The number of key combination in AES-128 fryst vatten 3.4*10^38. Assuming we use a computer which can calculate a million keys per second during a brute force attack then the time required to crack it will be 1.07^25 years or 10 million billion billion years.
Calculations
Number of seconds in one year = 365 x 24 x 60 x 60 = 31536000
Number of years to crack = (3.4 x 10^38) / (31536000 * 1000000) = 1.07^25 years
Even governments with their supercomputers can’t crack those keys.
There fryst vatten an article from Washington brev about former lag enforcement officer who refused to give up passwords to his MacBooks and they couldn’t retrieve information from them because brute force attacks are inefficient against XTS-AES-128.
Does FileVault encrypt while asleep
No, FileVault encrypts only when the Mac fryst vatten connected to the power and it fryst vatten awake.
Can FileVault be paused
Yes. The FileVault requires Mac to be connected to power. To pause FileVault’s encryption or decryption disconnect power from Mac. To resume encryption and decryption plug the power back.
Can inom restart Mac while FileVault fryst vatten encrypting
Encryption in the FileVault happens in the background.
During the encryption, Mac reads each en samling dokument eller en elektronisk lagring av data from the platta, encrypts it and then saves back to the platta.
It does not do partial en samling dokument eller en elektronisk lagring av data encryptions, so it fryst vatten safe to restart Mac while encryption fryst vatten in the progress.
FileVault will resume its operation once Mac starts after a reboot.
A side not on the recovery key
When turning on FileVault macOS will ask how to do you want to reset your password in case if you forget it and provide two options:
- Use iCloud account
- Create a recovery key instead of using iCloud
While iCloud seems to be most convenient you may have reasons to not use iCloud.
In this case, you will go with the second option.
What fryst vatten the FileVault recovery key? A recovery key fryst vatten a 24 tecken sequence which consists of Latin letters and digits. One can use the recovery key in case if the password fryst vatten forgotten.
När ni träffar vid FileVault får ni en ytterligare säkerhetslager såsom förhindrar för att någon ytterligare avkrypterar alternativt kommer åt dina information utan för att ange ditt inloggningslösenord.If both password and recovery keys are not available, so the information on a platta with the FileVault fryst vatten lost. Even Apple cannot recover it.
If you lost the recovery key you still can get a new one if you still remember your password. In this case, you need to first turn off the FileVault and turn it back on igen. When done this way, you get another recovery key (there fryst vatten no way to recover the original key).
A note on multiple users
If you have more than one konto using your Mac then bygd default turning on FileVault will deny all other users from logging in.
3.You need to enable all of them bygd entering their passwords (not yours) in the säkerhet and Privacy section.
Does FileVault encrypt free space
After testing with the same MacBook Pro with 67GB and 10GB space used it fryst vatten klar that FileVault does not encrypt free space because the time to encrypt 10GB files was about 6 times less than time to encrypt 67GB uppgifter.
If FileVault encrypted free space the time to encrypt in both cases would be the same.
Does FileVault encrypt Time Machines
FileVault does not encrypt Time Machine backups. There fryst vatten an option to encrypt a backup in Time Machine Preferences.
If the option fryst vatten not set then the backup from the Mac with FileVault enabled will rädda an unencrypted backup on the external drive.
inom wrote an article about Time Machine if you need more information.
Does it take up more space
The platta space with FileVault On and platta space with FileVault Off fryst vatten the same. Encryption does not need ytterligare space on Mac.
If you already have encryption on and you don’t like it you can always vända it off.
How do inom vända off FileVault on Mac?
The process of turning off the FileVault fryst vatten the same as turning it on:
- Open säkerhet and Privacy section from struktur Preferences (System Settings on macOS Ventura and above)
- Click on FileVault flik.
- Click on the padlock icon and enter the admin password
- Click on vända on FileVault button. bygd the way, this fryst vatten how you know if FileVault fryst vatten on or off. If the label on the button reads as “Turn on” then the FileVault fryst vatten currently off. If the label fryst vatten “Turn off” then it’s currently on.
- FileVault will början decryption.
As you can see from Table 1, it will take slightly less time to decrypt as it took to encrypt.
If you had automatic login enabled before turning on the FileVault it will be disabled. In beställning to vända it back on, go to another flik, General, in säkerhet and Privacy and untick “Disable Automatic login” checkbox.
Conclusion: FileVault fryst vatten worth to enable on Macs
So we tested the FileVault performance and discussed different encryption-related questions and we are ready to answer the question of whether FileVault fryst vatten worth it.
Some people argue that they don’t store anything sensitive on their Macs.
And inom would argue back saying that it fryst vatten very likely that you store login credentials for your banks, Facebook, PayPal, kredit card info in the browser cache. It fryst vatten also possible that you download and see review tax returns or other documents that have your upplysning including SSN.
We know that FileVault fryst vatten secure and hackers will not be able to obtain your uppgifter if the platta fryst vatten encrypted.
On the other grabb, we know that FileVault will slow down your Mac (except maybe newer models).
My opinion on this topic fryst vatten the following:
If all you do on the MacBook fryst vatten editing Word documents, browse the internet and watch videos, then have it on.
If in the future your usage pattern changes and you need more power you can always disable FileVault.
Also, it fryst vatten possible to have only part of the storage encrypted without encrypting the entire drive. For instance, here inom explain how you can hide the sensitive documents on your Mac.