Re: [Repeater-Builder] Re: Question on Motorola encryption
bredalrv1 wrote: > Thanks Everyone for the help I appreciated it a lot sounds very > expensive for the Motorola SecureNet. I have Contacted Transcrypt > and they said That there SC20-DES Encryption Board would work > through a Repeater without having to install one on the Repeater > Site. just wanted to get your guys opinion on it. They said there is > as Secure as Motorola DES-XL? It has been several years since I sold their stuff, so my memory is a bit fuzzy, but Transcrypt has several layers of scrambling that range from simple audio inversion, all the way to full blown digital audio rolling code scrambling. They do nothing to the carrier, all of their products deal strictly with the audio. That, in a nut shell is the difference between "encryption" and "scrambling" They really are two separate things.. Advantages to scrambling? 1). All of their scrambled audio will pass through a "regular" repeater as they have told you, since the carrier remains exactly the same as far as the repeater is concerned. 2). They make their products for darned near every radio known to man. If you are integrating scrambling into an existing system, it makes it a lot easier to sell, since the customer does not have to throw away all of their radios and start over. 3). If you buy their higher tier product, they have some really neat features such as OTAR, radio stun, code reset, and a bunch more neat stuff. One major thing to be aware of is that audio scrambling is a bit harder to "sync" up upon keyup than digital encryption. We're talking milliseconds here, but that delay can easily turn a radio transmission of "DON'T SHOOT" into "SHOOT". In 1999 when I sold their product to a large police department, I sent them a couple of demo radios for them to install demo boards into. From the beginning, all parties knew that we were talking about their highest (at the time) level of scrambler, I believe it was called the "460" as I recall. When they sent the demos back to me, we showed them around, and eventually made the sale. Later on, we discovered that they had sent the demos in with a much lower level of scrambler in them, because since they were demo'ing the radios, they wanted to demo a lower tier of scrambling, since it "synched up faster. We ended up programming delays into the system to accommodate the keyup time of the radio, the "sync up" time of the portable, and the MDC1200 unit ID packets which HAD to go first. All in all, they system worked well, and the PD was happy, but their expectations were originally to "go scrambled" and stay that way. With all of the extra overhead at the head of each transmission, they ended up staying in the clear most of the time unless they had something important to talk about that they didn't want on the scanners in the town... > > Thanks Again > In Repeater-Builder@yahoogroups.com, [EMAIL PROTECTED] wrote: > >>DVP is the lowest level of encryption DES/DVP were the 1st types. > > They found > >>that there was range problems and the "XL" versions came out. DVP > > was sold to > >>the general public, DES was only sold to government agencies. Both > > do not meet > >>the current government standards. A conventional repeater will not > > pass > >>either you need a "M" repeater setup for digital encryption. >> >> Dale > > > > > > > > Yahoo! Groups Links > > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
Re: [Repeater-Builder] Re: Question on Motorola encryption
send me your email address and info on your plains and I will send you some info. thanks John [EMAIL PROTECTED] - Original Message - From: "bredalrv1" <[EMAIL PROTECTED]> To: Sent: Monday, June 07, 2004 5:29 PM Subject: [Repeater-Builder] Re: Question on Motorola encryption > Thanks Everyone for the help I appreciated it a lot sounds very > expensive for the Motorola SecureNet. I have Contacted Transcrypt > and they said That there SC20-DES Encryption Board would work > through a Repeater without having to install one on the Repeater > Site. just wanted to get your guys opinion on it. They said there is > as Secure as Motorola DES-XL? > > Thanks Again > In Repeater-Builder@yahoogroups.com, [EMAIL PROTECTED] wrote: > > DVP is the lowest level of encryption DES/DVP were the 1st types. > They found > > that there was range problems and the "XL" versions came out. DVP > was sold to > > the general public, DES was only sold to government agencies. Both > do not meet > > the current government standards. A conventional repeater will not > pass > > either you need a "M" repeater setup for digital encryption. > > > >Dale > > > > > > > Yahoo! Groups Links > > > > > Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
RE: [Repeater-Builder] Re: Question on Motorola encryption
I've used them for Military Applications (ANG) and they work well. Gregg R. Lengling, W9DHI, Retired Administrator http://www.milwaukeehdtv.org K2/100 S#3075 KX1 S# 57 Member: ARRL, RSGB, RCA, WERA and ORC -Original Message- From: bredalrv1 [mailto:[EMAIL PROTECTED] Sent: Monday, June 07, 2004 4:29 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Question on Motorola encryption Thanks Everyone for the help I appreciated it a lot sounds very expensive for the Motorola SecureNet. I have Contacted Transcrypt and they said That there SC20-DES Encryption Board would work through a Repeater without having to install one on the Repeater Site. just wanted to get your guys opinion on it. They said there is as Secure as Motorola DES-XL? Thanks Again In Repeater-Builder@yahoogroups.com, [EMAIL PROTECTED] wrote: > DVP is the lowest level of encryption DES/DVP were the 1st types. They found > that there was range problems and the "XL" versions came out. DVP was sold to > the general public, DES was only sold to government agencies. Both do not meet > the current government standards. A conventional repeater will not pass > either you need a "M" repeater setup for digital encryption. > >Dale Yahoo! Groups Links Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
RE: [Repeater-Builder] Re: Question on Motorola encryption
Oops forgot to say with the base encoder you also have Over the Air Rekeyingdefinitely a nice toy. Gregg R. Lengling, W9DHI, Retired Administrator http://www.milwaukeehdtv.org K2/100 S#3075 KX1 S# 57 Member: ARRL, RSGB, RCA, WERA and ORC -Original Message- From: bredalrv1 [mailto:[EMAIL PROTECTED] Sent: Monday, June 07, 2004 4:29 PM To: Repeater-Builder@yahoogroups.com Subject: [Repeater-Builder] Re: Question on Motorola encryption Thanks Everyone for the help I appreciated it a lot sounds very expensive for the Motorola SecureNet. I have Contacted Transcrypt and they said That there SC20-DES Encryption Board would work through a Repeater without having to install one on the Repeater Site. just wanted to get your guys opinion on it. They said there is as Secure as Motorola DES-XL? Thanks Again In Repeater-Builder@yahoogroups.com, [EMAIL PROTECTED] wrote: > DVP is the lowest level of encryption DES/DVP were the 1st types. They found > that there was range problems and the "XL" versions came out. DVP was sold to > the general public, DES was only sold to government agencies. Both do not meet > the current government standards. A conventional repeater will not pass > either you need a "M" repeater setup for digital encryption. > >Dale Yahoo! Groups Links Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[Repeater-Builder] Re: Question on Motorola encryption
Thanks Everyone for the help I appreciated it a lot sounds very expensive for the Motorola SecureNet. I have Contacted Transcrypt and they said That there SC20-DES Encryption Board would work through a Repeater without having to install one on the Repeater Site. just wanted to get your guys opinion on it. They said there is as Secure as Motorola DES-XL? Thanks Again In Repeater-Builder@yahoogroups.com, [EMAIL PROTECTED] wrote: > DVP is the lowest level of encryption DES/DVP were the 1st types. They found > that there was range problems and the "XL" versions came out. DVP was sold to > the general public, DES was only sold to government agencies. Both do not meet > the current government standards. A conventional repeater will not pass > either you need a "M" repeater setup for digital encryption. > >Dale Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
[Repeater-Builder] Re: Question on Motorola encryption
What are you going to use it for? I cant remember but I think that the DVP would work through repeaters. As far as DES-XL I don't know. I'm versed in DES, as I designed a DES encreption/ decryption modem a few years ago for the military. The DES aproach is very likely a 64 bit serial algorithem with a 128 bit key. You figure out how secure it is. I guess you would have to know how the encryption is done. I do. Take my word. It's very secure. Enough for the military to use. 73 AC0Y --- In Repeater-Builder@yahoogroups.com, "bredalrv1" <[EMAIL PROTECTED]> wrote: > Hi, I would like to find out about Motorola Encryption products. > there seems to be a lot of different models. Like DVP DES-XL and > more which one would be the most Secure?. Also can they work on a > Conventional Repeater? > > Thanks Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Repeater-Builder/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
