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util/crypt/Dextor.lha

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Short:Good, fast, and easy encryption. v1.0
Author:Msi Software <msi at sn.no>
Uploader:Roger Hågensen <msi sn no>
Type:util/crypt
Version:1.0
Architecture:m68k-amigaos
Distribution:Freely Distributable Shareware
Date:1997-06-23
Download:http://aminet.net/util/crypt/Dextor.lha - View contents
Readme:http://aminet.net/util/crypt/Dextor.readme
Downloads:1152
$VER: Dextor.readme 1.0 (23.6.1997) #TEXT © Msi Software

Dextor 1.0 © Msi Software 1997 - All Rights Reserved!
DEX-I "Dynamical Encoded Xor scheme 1" Encryption

For Amiga OS 2.x/3.x, cli/shell only.
Created in Norway in a city know as Trondheim.
----------------------------------------------------------------------------
Shell Usage: Dextor <filename> <key> [<level>]

filename - the name of the file to encrypt/decrypt
key - the key to encrypt/decrypt with (max 256 characters)
level - optional, supported are 0,1,2,3 (0 is default)
        the higher the level, the better encryption.

----------------------------------------------------------------------------
History:

v1.0 - 23.Jun.1997
       First release!

----------------------------------------------------------------------------
Please note that the key is not stored in the encrypted file,
so if you forget it you are stuck forever :-)

Please note that Dextor currently do not allow encrypting
an already encrypted file.

Dextor will store the encryption level in the
encrypted file, so there is no need to have to remember
what level you used for encryption.
You just worry about remembering that key :-)

Please note that Dextor will replace the original file,
(it will use the same name).
If you want to make it easier to recognize files made by Dextor,
please use the extension ".DEX" (add it to the end of the name).

Please note that files are loading directly into memory.

----------------------------------------------------------------------------
Here is a tip:

Pack/Archive a file then encrypt it with Dextor.
or pack the file, encrypt it, then pack it again.
Packing it first will not only make the file smaller,
but Dextor will encrypt faster.
And it will be very hard trying to crack the encrypted file,
since there hardly is anything senssible in a LHA/LZX/XPK file etc.

Dextor will also clean up it's memory after use.

Dextor is also usable from scripts etc.
It returns RC 5 (RC = return code) with user based errors,
and RC 10 at general errors,
and RC 20 at unknown errors.
RC 0 is returned if all went well.

Dextor can encrypt any binary files (meaning ALL files :-)
Why not try to archive more than one file,
or even a directory with LHA or LZX.
Then encrypt the resulting archive with Dextor :-)

----------------------------------------------------------------------------
IMPORTANT!

AND PLEASE TAKE GOOD CARE OF YOUR KEY,
IF YOU LOOSE IT (FORGET IT) YOU WILL BE UNABLE TO DECRYPT
THE FILE, AND ALSO MAKE SHURE YOU CHOOSE AN EASY TO REMEmBER KEY
THAT IS UNNUSUAL AND NOT SO EASY TO GUESS.
Dextor IS ONLY AS SECURE AS YOUR KEY IS,
SO BE CAREFULL IF INTEDING TO GIVE SOMEONE A KEY FOR
SWAPPING OF SECRET ENCRYPTED FILES,
MAKE SHURE NO-ONE IS ABLE TO SNAP UP THE KEY.

----------------------------------------------------------------------------
Dextor 1.0 DEX-I scheme: Speed tests
System used: Amiga 1200HD, OS3.1, Blizzard 1230-IV/50MHz 68030 w/68882 FPU.
             ROM mapped to fastram, 8MB 60ns fastram.

Size of test file (located in ram disk): 328160 bytes
The speed of Dextor is not affected by the contents of a file,
nor is there any real difference between encrypting/decrypting.

Level 0: 3 secs.
Level 1: 4 secs.
Level 2: 5 secs.
Level 3: 6 secs.

For a 1MB file it would take around 10 secs with level 0.

----------------------------------------------------------------------------
Disclaimer:

Use this program on your own risk,
I nor Msi Software or anyone else is responsible
if things go wrong. But if they do, please let us know
so we can fix any possible problems with this software.

----------------------------------------------------------------------------
Distribution:

Freely Distributable ShareWare
To pay the sareware fee, send me something nice via email,
or via normal (snail) mail.
Like perhaps a copy of your latest game or program,
or perhaps a cool picture/anim or module etc.

Please let me know before you send files larger than 1MB in size.
For Commercial/ShareWare/LicenseWare,
send me a free registered and complete copy of your product.
Updates to Dextor 1.x can be used freely,
and the license is a lifetime license.
A future Dextor 2.x will be free to registered Dextor 1.x owners,
unless stated otherwise in Dextor 2.x
Currently Dextor 2.x is maaaaany months away.

Right now, I want YOUR comments on Dextor, So email me know.
Dextor can be distributed freely as long as a nominal
copying fee is only charged.
Aminet and Amiga coverdisk CD's is allowed distribution,
and Fred Fish has my exclusive permission,
and can consider himself the first registered Dextor owner (for free :-)

----------------------------------------------------------------------------
Dextor was created in Amiga E v3.2e by Wouter van Oortmerssen.

Dextor is Copyright © Msi Software 1997
DEX-I encryption scheme is Copyright © Roger Hågensen 1997
Amiga is Copyright © Amiga International 1985-1997
Amiga E is Copyright © Wouter van Oortmerssen 1991-1997

----------------------------------------------------------------------------
Author: Roger Hågensen
        Kolstadflata 35B
        N-7078 SAUPSTAD
        Norway
   Tel: (+47) 72590735
 Email: "Roger Hågensen <msi at sn.no>"   (Subject: "Dextor 1.0")
   WWW: "http://www.sn.no/~msi/index.htm"


Contents of util/crypt/Dextor.lha
 PERMSSN    UID  GID    PACKED    SIZE  RATIO     CRC       STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                 2420    5491  44.1% -lh5- 1a4a Jun 23  1997 Dextor.readme
[generic]                 2089    4336  48.2% -lh5- 6166 Jun 22  1997 Dextor/Dextor
[generic]                 2338    5267  44.4% -lh5- f585 Jun 23  1997 Dextor/Dextor.Txt
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         3 files    6847   15094  45.4%            Jun 23  1997

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