SureCrypt-CLI (command-line interface)
Copyright (c)2004 Dariusz Stanislawek
freezip(at)bigfoot,com


SureCrypt is a file encryption program.



USAGE

sc keyfile e|d source destination

Max keyfile size is 64 bytes.
Encryption example: sc a:\my.key e d:\x\data.zip data.enc
Decryption example: sc my.key d data.enc c:\tmp\data.zip



NOTES

Use double-quotes for file names with spaces.

SureCrypt does not overwrite or delete existing files.

Press Ctrl+C to abort processing, then manually delete leftover files.

Password-to-keyfile is an alternative to binary keyfiles. It will not be
as secure as a binary, random key, but can be memorized and easily recreated.

type command: copy con my.key
type password: abc1234567890 (example only :-)
press Ctrl+Z and hit Enter

Use a difficult, alpha-numerical (including space and special characters),
case sensitive password with at least 10 and up to 64 characters.

Password-to-keyfile can also be done with any text editor.

The best performance is achieved when source and destination files are on
physically separate drives.



MULTI-FILE PROCESSING

Create the following file and folder structure:

sc.exe
my.key
TMP\ (folder for processed files)
   |
   |-file-for-encryption
   |-file-for-encryption
   |-...
   |-TMP\ (sub-folder for encrypted files)

then type on the command-line:
for %f in (tmp\*.*) do sc my.key e "%f" "tmp\%f"



IMPLEMENTATION

Cipher: Rc4
Key Size: max 512 bits (64 bytes)
IV: 16 bytes
Cipher File Structure:
[plaindata CRC = 4 bytes] + [IV = 16 bytes] + [cipherdata]

Source code and a fully compatible Windows-GUI version are available from:
http://www.ozemail.com.au/~nulifetv/freezip/freeware/
http://freezip.cjb.net/freeware/



FREEWARE SOFTWARE

Free for private or business use. Free for distribution and publication,
but in unmodified package. It can be freely bundled with any product or
application. Individual permissions are not required and will not be given.



DISCLAIMER
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THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
=========================================================================