Using descrambling software, Having problems.

[fez_uk]

Well I found a local user thats using scrambled audio on a freq and I have tried 3 different programs and none have worked.
What am I doing wrong?

Basicly I have tried mic and line in inputs then output audio to front headphone and still nothing. If this is wrong how should it be configured?
The audio comes through the pc speakers/headphones all the same, I have tried changing the scrambled tone/freq thing still staying the same.

I heard you need a duplex sound thing, How would I be able to determine if my pc has this?
If it isnt full duplex is there a program i can use that descrambles recorded scrambled audio?

thanking in advance.

 

[iMONITOR]

Are you certain that they're using the audio inversion method, or could it be encrypted?

 

[fez_uk]

Yes, as they sound like donald duck (like on usb when not clarified perfect, and yes its defently nfm) and I can recognize some words now and then.
Its a short term hire freq So I doubt it is encrypted.

 

[kd7gxu]

type of inversion

There are two types of voice inversion, rolling code and non rolling code. If you are trying to unscramble rolling code, it is next to impossible because the inversion keeps changing its reference. I am not sure of the specific technical terms but I a guessing that the audio frequency shift changes each time the code jumps. That may be why you get a word once in a while, when it comes back around to where your descrambler is.

 

[morfis]

Very little "rolling code inversion" was used in the UK. The police MASC being the main example and that is now pretty much unused (except perhaps by people illegally using the old plod radios).

Quite a few people starting to use simple inversion in the last year or so though.

 

[fez_uk]

I didnt hear some of the voices while trying to descramble, I hear parts of words I recognise while listening to the scrambled link thus showing it cant (or highly unlikely to be encrypted).

The 3 programs I used did not work.

 

[RayAir]

Masc

Very little "rolling code inversion" was used in the UK. The police MASC being the main example and that is now pretty much unused (except perhaps by people illegally using the old plod radios).

Quite a few people starting to use simple inversion in the last year or so though.

MASC was a neat, high security encryption/scrambling scheme. If you listen to it, you can tell it is different from rolling code scrambling boards like the Transcrypt 460, Midian TVS-2,etc. MASC uses DSP and is closer to a time domain scrambler than a frequency domain scrambler. MASC samples the audio in small segments, inverts and reorders the voice. Example of clear voice segments - 1,2,3,4,5. Turn MASC on and you might get it transmitted inverted like this- 5,1,3,2,4. Very cool as there is nothing out on the market like it. I was lucky enough to find 2 MASC coded radios on Ebay and I use them for personal use on the FRS bands. It's funny listening to co-channel users remark about the strange sounds they are hearing (MASC encryption) on the radio.

 

[mike_s104]

if you're sure it's voice inversion, why not try a hardware solution?

http://www.radioreference.com/forums/showthread.php?t=70774&highlight=SSB

 

[JnglMassiv]

Well I found a local user thats using scrambled audio on a freq and I have tried 3 different programs and none have worked.

Which programs?

 

[Napalm]

Invert2 works.

You just have to be patient and play with the inversion point.

Make sure you have Line-In MUTED on the output side of your mixer, otherwise you'll hear it twice, once encoded and once decoded.

 

[RayAir]

Very little "rolling code inversion" was used in the UK. The police MASC being the main example and that is now pretty much unused (except perhaps by people illegally using the old plod radios).

Quite a few people starting to use simple inversion in the last year or so though.

I don't mean to change the subject, but the MASC scrambler was a very good device providing high security that was never compromised. Instead of using a standard rolling code scheme like say the Transcrypt 430 or 460, MASC used a multi-band reordering inversion method that was DSP based which allowed it to use a much wider range of inversion freq's. So in a way it is similar to the Transcrypt DES scrambler, but MASC used multiple bands and reordered them very rapidly. This achieves very high privacy similar to time domain scrambling. I was lucky enough to purchase a pair of HT600's on Ebay with matched MASC scramblers.