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Re: Encryption
Posted: Wed Apr 22, 2009 10:56 pm
by bir0
brisbanescan wrote:this is true BCC are just a client so is Translink for that matter which are the people who tell Transit Officers what to do now in an agreement with QR.
Currently using Tetra.
QUT
Chubb Security
BCC Buses
Cityworks
Transit Guards
Riverstage (only use it sometimes - still preform there hyt's)
I have personally used the MPT850's in my job on some Event sites for there bump in and bump out's they aren't all that bad coverage in some spots is bad however. and the fact that someone can locate you with a application for some departments is kinda creepy
I was wondering what QUT were using! Seeing has how there are no useful frequencies listed for them in ACMA databases....at least under any variation or deparment name or address I can think of.
I have been very close to those radios in operation with close capture on on my ubc92xlt and have never nabbed the frequency. close capture works well for me normally but not for QUTs radios.
Re: Encryption
Posted: Mon May 04, 2009 7:30 pm
by Phil
yeh i never have my scanner with me whilst i am working so i couldn't do it either. but yes QUT are using these Tetra radio, Border Security, Securitor are still using analogue i noticed.
Re: Encryption
Posted: Tue May 05, 2009 4:51 pm
by fire_rescue
just wondering
ACMA monitor commercial stuff do they have the equip to monitor QPS encryption ?
Re: Encryption
Posted: Tue May 05, 2009 8:01 pm
by scrawn80
its a shame bill cheek isnt around anymore
Re: Encryption
Posted: Wed May 06, 2009 12:17 am
by Comint
scrawn80 wrote:its a shame bill cheek isnt around anymore
Even so, he wouldn't have been able to do anything about encryption.
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Comint
Re: Encryption
Posted: Wed May 06, 2009 12:27 am
by Comint
fire_rescue wrote:ACMA monitor commercial stuff do they have the equip to monitor QPS encryption ?
That's a "double barrel" question.
If you mean "do they have the equipment to decrypt the QPS transmissions", I would say probably NOT. However, if you mean "do they have the equipment to monitor QPS transmissions to determine if QPS is complying with the regulations, and/or technical specifications" then the answer would be YES.
Monitoring doesn't just mean listening to plain language conversations on the air.
Google the words: Sigint, Elint, and Comint. They are all forms of Monitoring.
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Comint
Re: Encryption
Posted: Wed May 06, 2009 11:31 am
by fire_rescue
ill expand the question
does acma have anything to monitor encrypted freqs or channels to monitor if people comply with licensing specs and doing the right thing
Re: Encryption
Posted: Wed May 06, 2009 6:58 pm
by hotmetal1000
Comint wrote:If you mean "do they have the equipment to decrypt the QPS transmissions", I would say probably NOT. However, if you mean "do they have the equipment to monitor QPS transmissions to determine if QPS is complying with the regulations, and/or technical specifications" then the answer would be YES.
Comint pretty much answered it there for you.
Re: Encryption
Posted: Fri May 08, 2009 11:26 pm
by Mathew
Despite what anybody says, it will not take "100 million years to crack the encryption", everything is possible. If you want it badly enough, you'll do it.
I was speaking to a Police officer in Melbourne a while back, he said they have found people with digitally encrypted listening scanners. I don't know how solid that is, but he claims they have.
Cheers,
Re: Encryption
Posted: Sat May 09, 2009 9:53 pm
by scrawn80
ok how does encryption work
i know how voice inversion and the multiple inversion work
same as digital converting the audio
i will say that i am a simple person with alot of practical experience
so could someone point me in the right direction
the knowledge i have learnt from teaching myself
surprises a lot of techs
but its just finding the right place to start for learning about something
its something i have looked at a few times
and put in the to hard basket
anyone
Re: Encryption
Posted: Sun May 10, 2009 11:53 am
by Comint
scrawn80 wrote:ok how does encryption work
That really depends on the type of encryption used. The following two Sites will give you a start.
For DES:
http://en.wikipedia.org/wiki/Feistel_network
and for AES:
http://en.wikipedia.org/wiki/Substituti ... on_network
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Comint
Re: Encryption
Posted: Sun May 10, 2009 1:28 pm
by scrawn80
ok then from the quick read through
the DES is now classed as a insecure system
Re: Encryption
Posted: Sun May 10, 2009 3:51 pm
by Comint
scrawn80 wrote:ok then from the quick read through
the DES is now classed as a insecure system
Straight DES has been 'publicly' cracked at least three times to my knowledge. However, most organisations that are still using DES, are using enhanced versions of the standard, such as Triple DES and DES-OFB, which are considerably harder to crack.
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Comint
Re: Encryption
Posted: Tue Jun 09, 2009 12:54 pm
by melbourneradio
I have personally used the MPT850's in my job on some Event sites for there bump in and bump out's they aren't all that bad coverage in some spots is bad however. and the fact that someone can locate you with a application for some departments is kinda creepy[/quote]
a little off topic , use them every day here in sunny old vic , and most of the time they are great