RE: Announce loop-AES-v1.3d file crypto package

"IT3 Stuart B. Tener, USNR-R" <stuart@xxxxxxxxxxx> · Sun, 5 Aug 2001 00:38:19 -0700

Mr. Ruusu:

	General questions:

a) Presuming that I create a loop-aes device and place NTFS on the device. Do you plan a Windows 2000 implementation of loop-aes at all, such that loop-aes encrypted files could be decrypted under W2K (there are drivers for W2K to read ext2 filesystems also)? I recently was told of a product called "BestCrypt" (yeah it is commercial, but it does also work, is not badly over priced either).
b) Since loop-aes is an encryption layer between the OS and filesystem, how much overhead do you suspect it will place upon a filesystem to do its encryption work?

	Well let me ask you about a scenario then:

a) LOOP-AES is implemented
b) A filesystem is placed onto a loop device
c) Wont increasing the size of the physical file affect the encryption?
d) How would such an increase in the file size be accomplished?
e) If it was accomplished (with ReiserFS installed), ReiserFS can expand itself to encompass the new physical space

Very Respectfully, 

Stuart Blake Tener, IT3, USNR-R, N3GWG 
Beverly Hills, California
VTU 1904G (Volunteer Training Unit) 
stuart@xxxxxxxxxxx 
west coast: (310)-358-0202 P.O. Box 16043, Beverly Hills, CA 90209-2043 
east coast: (215)-338-6005 P.O. Box 45859, Philadelphia, PA 19149-5859 

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Sunday, August 05, 2001 12:14 AM

 -----Original Message-----
From: 	root@xxxxxxxxxxxxxxxxx [mailto:root@xxxxxxxxxxxxxxxxx]  On Behalf Of Jari Ruusu
Sent:	Sunday, August 05, 2001 12:08 AM
To:	stuart@xxxxxxxxxxx
Cc:	linux-crypto@xxxxxxxxxxxx
Subject:	Re: Announce loop-AES-v1.3d file crypto package

"IT3 Stuart B. Tener, USNR-R" wrote:
> I am curious if your loop-aes virtual filesystem can be resized at all in
> anyway? Suppose I create a 1GB encrypted disk, and need to expand it by
> 500MB, is that possible in a "partition magic" style way? I know partition
> magic is not going to do it (for a plethora of reasons), but do you plan a
> utility to do just that (grow an encrypted drive) if the underlying hard
> ware device has space available?

Loop-AES is not a filesystem. It is a loop device with built in AES
encryption. If you expand the underlying partition or file, the loop device
will grow accordingly. Of course, loop device must not be mounted at time of
expansion.