7 ms·
author of the break here, ama.
by mstef 5y ago
author of the break here, ama.
- jacquesm 5y agoCool job, that brought back a lot of memories.
- sounds 5y agoI'm curious whether there is any info on the dev team who created the PX-1000 (where PC-1000Cr is implemented). Any more info on how the NSA got a backdoor inserted? There's [1] which gives a general overview. This seems like a fascinating story, would be happy to read more! [1] https://www.cryptomuseum.com/crypto/philips/px1000/nsa.htm https://www.cryptomuseum.com/crypto/philips/px1000/nsa.htm
- mstef 5y agoafaik the firmware was developed by philips ufsa[1] based on directions (test vectors?) by the NSA, lots of effort was put into making the algo run efficiently on the CPU in the px1000. [1] https://www.cryptomuseum.com/crypto/philips/usfa.htm https://www.cryptomuseum.com/crypto/philips/usfa.htm
- mstef 5y agoalso interesting might be this generic link unrelated to the NSA backdoor: https://cryptomuseum.com/crypto/philips/px1000/ https://cryptomuseum.com/crypto/philips/px1000/
- marrold 5y agoA few of us have bought rebadged versions of these recently and we're looking to create a backend for them that accepts a call (probably via SIP / VoIP) and then demodulates the v.23 and does something useful with it. Are you aware of anyone thats done this already? We're not desperate to support the encryption initially but I guess it would be nice too. Thanks
- mstef 5y agosorry, no. but there is an emulator[1], so you can test the roms, or you can write your own code and test it without having the hw. [1] https://github.com/iddq/sim68xx/tree/px1000 https://github.com/iddq/sim68xx/tree/px1000
- marrold 5y agoNice, thanks
- flyinghamster 5y agoThe SpanDSP library has low-speed FSK modem implementations (including Bell 202 and V.23). I've employed the 202 demodulator to listen in to some radio-based telemetry. https://github.com/freeswitch/spandsp https://github.com/freeswitch/spandsp
- classichasclass 5y agoI've got a pair of these somewhere, acquired domestically (USA) AFAIR. Assuming these are crypto-enabled, any easy way to tell what firmware is in them? Edit: These are Text-Tells.
- mstef 5y agosee the section "Different Versions" on this page: https://cryptomuseum.com/crypto/philips/px1000/ https://cryptomuseum.com/crypto/philips/px1000/
- mperham 5y agoWhat the heck is PX1000Cr??? I’ve been in tech for decades and have never heard of this. The link offers no actual explanation. Could you supply some background? Edit: found this https://www.cryptomuseum.com/crypto/philips/px1000/nsa.htm https://www.cryptomuseum.com/crypto/philips/px1000/nsa.htm
- rasz 5y agoEver heard of TRS-80 Model 100? Same thing, slightly different Japanese OEM.
- jacquesm 5y agoThe Model 100 is a completely different kind of device than the pocket telex.
- rasz 5y agoHow is it completely different kind of device? A completely different kind of mobile terminal with build in modem based on Japanese platform? PX1000 looks to be further evolution of Epson HX-20 design. With PX-2000 Philips didnt even try to manufacture locally anymore deferring to Seiko entirely. Or did you mean detailed architecture details, lcd, cpu arch and different OEM Kyocera?
- deleted 5y ago[deleted]
- deleted 5y ago[deleted]
- frozenport 5y agoHow do we know it's a backdoor and not a technical error?