A ZRTP Hardphone for secure voice communications
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Would love to start with open hardware, but what I got on hand is a Raspberry Pi and 2 cheap usb soundcards. It should be easily replicated using only open hardware. See all architectures supported by Debian.
It will have at least the same basic UI features as the USA Western Electric Model 2500 telephone but with some extras needed for ZRTP: more keys and a screen to show the SAS code.
Made a new box, put everything inside and wired it.
So cool, I thought.
Then, plugged it to the power and find out that you can listen the radio on the ring speaker. And some other noises too.
After reading the Ganssle article about analog noise made a few tests to isolate the source. I thought that the problem comes from the mains power supply and the nearby powerful AM stations. Can hear the radio even with the input cable disconnected.
Also there is no protective earthing on my house (or neighborhood).
Installed the amp inside a metal box and moved the power supply further, but the noise is still there.
Just discovered that twinkle does not support TLS for the SIP auth.
Fortunately, there is another project called SFLphone with TLS and ZRTP support :)
So the plan now is to use the SFLphone core. I'll have to write the software to interact between the UI and the core.
A cardboard box
is free and easy to work with.
The box is turned the inside out, so it is possible to write things on it.
All the human interfaces are in place now. That was easy and fun to mess with.
Hook made with cork stopper and aluminum foil. All glued with cyanoacrylate.
Got this old phone for 3 €. Thinking about reusing the handset, keyboard and case.
First thing is make a call with ZRTP to check if the raspberry pi is powerful enough.
After installing and configuring Debian and twinkle, I am very pleased to announce that it works flawlessly!
Next step: human interfaces.
### [ WRITE IMAGE TO SD ]
wget "http://93.174.101.10/bt/09bc05ab03780f279390e9cf6a15c7c249f712e1/data/2014-01-07-wheezy-raspbian.zip"
7z x 2014-01-07-wheezy-raspbian.zip
SD_CARD=/dev/sdX # Change it to your SD card device name
md5sum 2014-01-07-wheezy-raspbian.img ; "It should be 6d8e5a48ff7c6bdc0bc0983bc32f75b8"
dd bs=1M if=2014-01-07-wheezy-raspbian.img of=$SD_CARD
### [ OVERCLOCKING AND MEMORY CONFIG ]
# Grow the partition
# Set locales
# Set hostname
# Set Overclock to Turbo
# Set Advanced Options > Memory Split to 16
Reboot? yes
### [ INITIAL SYSTEM CONFIG ]
# Access the pi using keyboard+screen or ssh (root password is raspberry)
passwd
passwd pi
# Regenerate OpenSSH Host Keys:
# Connect some mouse and move it (I hope that it does something)
rm /etc/ssh/ssh_host_# ; dpkg-reconfigure openssh-server
Hi!
My name is Manu! I have zrtp phone from chineese.
http://www.ultrative.com/pro1.asp?id=210
I have testet and it works very well.
On the mainboard there is a serial pinout. I have fully access to phone.
But the software on it is quick and dirty programmed, many errors on boot. So i would create my own software.
I have not found any other hardware phone on the net.
I have also tested the tool zebedee. It can tunnel udp packets with encryptet tcp stream. The key management is also diffie helleman. It works very well with iax2 and sip.
So i have a Secure-Box with FreeBSD and Zibidee that can tunnel every data secure over the net. Also i have testet, IAX2 encyption and zebedee, so you can make double encryption, works also very well.
If you intrested on some projects, please contact me.
Best wishes, manu
Sorry, for my bad english
Yago
Solenoid
Jacob Daniels
andriy.malyshenko
Awesome project! Unfortunately the link to download the raspbian img file is not working. Is there an alternative link or link for the full code to this project?