Peter Neubert wrote:
>
> Hi All
>
> We are curently doing a software project for a customer and we are working
> On-Site, we have however reason to suspect that some people are trying to
> enter our computers when we are not there (once 1 pc had been opened and not
> closed well etc)(Paranoid ? who me :-)
>

The Question is not if we art paranoid, but are we paranoid enough !


> What we are looking for is some kind of nice simple utility to encrypt our
> project directories with source code when we are off-site
>


You can encrypt the directory every time you leave your
rooms and decrypt it when working again.
You can use use tar, zip or arj to pack all files into one and then
encrypt it with PGP. The PGP programm has an option for symetric
encryption (IIRC triple DES or IDEA )  of files, not the usual
public key algo for sending e-mails. There are 2 versions of
PGP, one for USA & Canada, and one 'international' Version for the
rest of the World. The Software is free for personal use, there are
comercial Versions also avaible. Lock at :

http://www.pgpi.com
or
http://www.ifi.uio.no/pgp/ for details.

Lock for the older Versions 2.6.x
There is a newer Version 5.0, but i am not sure if it suports
symerical encryption only.

DON'T (!) use the Password Options of ZIP, ARJ ... packers !
There are tools avaible on the Internet for cracking this
passwords and once don't need to be a h*acker to use them.

Be sure you have deleted and overwritten the original data.

The PGP manual can give you many good advices on security,
cryptography and privacy, not only about PGP. Read it !

A second option is to use the Security file System from :

http://www.cs.auckland.ac.nz/~pgut001/sfs.html

Or simply search for sfs or Secure File System.

There the whole paritition is encrypted and stored on
your hard drive. After entering the password files are
decrypted and encrypted on the fly. It should be transparent
to the user and apears as a normal file system.

The last version of the device drivers is some months old and
i dont know, if it wolud work with modern OS like Windows 95.


> If anyone knows about such a product - preferably shareware, freeware :-)
> with a nice tight 128/64  bit encryption it would be great
>


There are also other Options to increase security:

Sombody mentioned storing sensible data on a ZIP drive.
Sound very eazy !

If you only want to restrict acess to the PCs, using a BIOS
password is also suitable. I have seen PC cases where you
can use a padlock for preventing opening. It woudn't help
against burglar.


On my hompage i have colected some general Links
about privacy and cryptography at :

http://www.informatik.hu-berlin.de/~ranguelo/list.html#Hack

Maybe they are also usefull to you.



Hope, this helps a bit.
St.