Apple File Security Encryption Algorithm

About SheepShaver, a PPC Mac emulator for Windows, MacOS X, and Linux that can run System 7.5.3 to MacOS 9.0.4.

Moderators: Cat_7, Ronald P. Regensburg, ClockWise

Post Reply
Amyunimus
Space Cadet
Posts: 4
Joined: Wed Jul 11, 2018 9:29 pm

Apple File Security Encryption Algorithm

Post by Amyunimus »

Does anyone know what encryption algorithm was used the Apple File Security? The only information I can find is that it was 128-bit encryption.

I have some old files that were encrypted on OS9 and I'm hoping to decrypt them using SheepShaver (I know the password), but they aren't recognized as being encrypted (no little yellow key in the corner of the icon) so I'm trying to learn more about the algorithm.
Jorpho
Master Emulator
Posts: 380
Joined: Fri Sep 17, 2004 4:22 am

Re: Apple File Security Encryption Algorithm

Post by Jorpho »

Are you sure the old files were copied and archived correctly? If they were copied to a Windows drive, they may have lost their resource forks, or at least their Type/Creator information.
emendelson
Forum All-Star
Posts: 1706
Joined: Tue Oct 14, 2008 12:12 am

Re: Apple File Security Encryption Algorithm

Post by emendelson »

Try creating an encrypted file and see if you can decrypt it. If so, then Jorpho's guess may be right. You might be able to use an old utility like FileBuddy to restore at least part of the lost resource fork.
Amyunimus
Space Cadet
Posts: 4
Joined: Wed Jul 11, 2018 9:29 pm

Re: Apple File Security Encryption Algorithm

Post by Amyunimus »

Yes, they have been moved around a lot,

I was able to change the file attribute using instructions here
Post Reply