Secure phones from VectroTel?

[Perry E. Metzger]

Following the links from a /. story about a secure(?) mobile phone
VectroTel in Switzerland is selling, I came across the fact that this
firm sells a full line of encrypted phones.

http://www.vectrotel.ch/

The devices apparently use D-H key exchange to produce a 128 bit AES
key which is then used as a stream cipher (presumably in OFB or a
similar mode). Authentication appears to be via a 4 digit pin,
certainly not the best of mechanisms.

Does anyone out there know much about these products and their
security properties (or lack thereof)?

Perry

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