This submission is a "Is such a thing made" and "Where can I
get it" request. I would appreciate any pointers to public domain
or commercial encryption/security devices to do the following:
Given 16 networks A,B,C,..,P all internet connected. Within each
network is a reasonably secure subnet designated by small letters
a,b,c,...,p. I wish these subnets to have safe encrypted telnet
and ftp sessions with each other. Encryption keys should be
associated with the originating user within the subnet, rather than
the originating machine within the subnet.
The first application is a host in subnet "a" to which users in
subnets b...p can telnet. The host is a Unix box and the users are
on DOS platforms. The Unix software application is available by
standard telnet and cannot be modified to support application level
encryption. The same goes for the DOS boxes which will be running
plain vanilla tcp/ip packages. The encryption should prevent successful
"snooping" of packets along the path between the "safe" subnets.
The Unix host in subnet "a" should be accessible from outside the
subnet only by passing thru the encryption device.
I don't see this as a "firewall" so much as an encrypting telnet
proxy. I would not want the device to prevent normal communication
as it currently exists for the subnet machines, but rather to add
the encrypting function for users accessing the application in
Do such encrypting telnet proxy systems exist? Where can I find