A Cryptographic Phone
In 1997 the team of Kevin Fu, Ben Adida, and Rodrigo Leroux
designed and built a cryptographic phone. We started with a
breadboard, copper wire, and a few chips. The final result allowed us
to transmit encrypted voice over a copper pair. Alas, we did not have
time to implement the the phone interface because at the last minute
we toasted our vocoders donated from Qualcomm. Anyhow, we submit to
the public domain our design and report under the GPL. Let us
know if you use our design or if you have questions. Happy
talking.
Maintained by Kevin Fu