Background The military has a need for secure communications. These fall into two raytheon KIV-7M catagories: Voice and Data. The method of encryption depends on the channel used.
For VHF voice communications the VINSON comsec system has been in place for a number of years. KYV-2 and -2A were designed to implement VINSON on the PRC-68 series squad radios. The system also is known as SAVILLE. The KY-57 sends a synchronization header at the start of each transmission. The radio operator should hear beeps when the crypto box syncs.
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There is no provision to hear a clear transmission when the SVM is installed on a radio. SVM is installed the only way is if the transmission is encrypted. When the SVM was developed the PRC-68 and PRC-68A were in service. The Magnavox part number for the SVM is 705293-801. This is probably different from their part number for the KYV-2. The “A” version is about 2 inches long vs.
5 inches for the original version and instead of a multiple PCB construction is made all in one module. The “A” version weighs only 9 oz. When the SVM is used the battery life is cut in half with either the KYV-2 or -2A. PRC-68A for plain text communications, since there is no receiver plain text override capability.
KYV-2 will store only one cryptographic variable at a time. KYV-2A is a nonreparable, self-contained, solid-state unit that consists of only one PCB formed within a module and enclosed in a wraparound aluminum case. Operationally and functionally they are the same. 10 the Marines ordered over 2,800 SVMs and less than 20 TS-13 test sets. This is an interesting read with info about the PRC-68 and PRC-68A as well as some description of the KYV-2 and KYV-2A.
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SINCGARS RT-1523 radios which are now current. BANCROFT is used with the KY-67. If there is a need to zeroize, the hold up battery and main battery are disconnected THEN the switch can be set to OFF or Zeroize. In this way the key generator and fill gun do not need to be near a combat area. SVM connector on some PRC-126 radios.
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When trying to use the SVM-68, the PRC-126 radio transmits a carrier, but NO voice of any kind with the SVM-68 switch in either position. The radio with a SVM-68 installed does not receive another station. Much wider than a normal voice signal. SVM the audio is a strange sound. The literature on the SVM says that there is no clear speech capability on the SVM, but maybe that does not apply to an SVM without any key loaded? Do NOT connect the SVM to a 15 Volt battery with the SVM switch set at “OFF Z”. This shorts out the internal power supply to drain the caps and also shorts out the main radio battery.
The Key Load connector on the KYV-2 uses a nonstandard pin out that is not compatible with the key load connector on the common fill devices like the KYK-13, KOI-18, KYX-15 and the CYZ-10. The logistics nightmare that this would cause may be the real problem. There is no plain text override capability. The SINCGARS radios have the ability to hear unencrypted voice. This is a very important consideration. SVM does not work on all of them without some special configuration. By “works” I mean that a digital signal is transmitted.
This makes sense since the VHF High Band radios do not have enough bandwidth to support the 16 k bits per second digital data. When the radio is turned on the LCD does not display anything. There must be code in the microcontroller that does not allow the SVM to be used with high band RF modules. SYNTH module that is related to SVM operation, but so far I don’t know it’s purpose. This causes the receiver to not lock up.
I have heard that you can communicate using two unkeyed SVMs, but need to wait for my second SVM to arrive to test this. It might require using two PRC-68 model radios? 8 June 2002 – Now have 2 each SVMs. The serial number is prefixed by “E” indicating an engineering unit. When an SVM is attached to a PRC-68 and PRC-68A you can talk from the PRC-68 and hear the voice on the PRC-68A, but not the other way around.
This is with no key loaded into the SVM. If the receiving radio has the squelch disabled you hear noise when there is no transmission and when a transmission is received the radio quiets just like when no SVM is installed. I think this is bug in the PRC-68, allowing the SVM to be used without a key installed. 28 April 2004 – Can’t get clear voice when using two SVMs on two PRC-68 radios. Also can’t repeat the experiment where a PRC-68 can talk to a PRC-68A?
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Also can’t repeat the experiment where using SQUELCH DIS shows quieting? The spectrum analyzer confirms digital data is being sent on all setups, so the SVM is connected and working. Maybe need the Hold Up Battery? One of the SVMs has a 3 zinc air cells, but one is dead, and the other SVM has no HUB. E – internal battery voltage, about 4.
4Volts for three fresh 675 hearing aid batteries. Probably used to confirm the state of charge of the internal batteries. This could be done without loosing a key. The voltage on the remaining pins is measured with a 100 k Ohm resistor to 3 AA cells, about 4.
100 Ohm directly across the Hold Up Batteries may be too heavy a load for them, reduced thier voltage from 4. 29 Nov 2003 – May need to apply 15 Volts to pin A then repeat the above pull up and pull down tests. This is the common “load me” signal method. Also need to try a 2 or 3 step process where one of the pins is pulled up or down then another is pulled up or down to get the handshake going. The Harris PRC-117 supports DS-101 and DS-102 Fill Interfaces. CYZ-10 Data Transfer Device, or the General Purpose Tape Reader, TAMCN A8024.
Secure Voice Module Key Load Connector. But the SVM uses pin A to receive DC power from the key loader so that it can be programmed when not attached to a radio. The SVM uses pin E to monitor the Hold Up Battery and pin F as common ground. So it looks like the 18290 can not load the key into the SVM unless a special cable was used. 10 Feb 2003 – Note The KYK-13 is referred to as the VINSON fill device.
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As far as I can tell in all other key fill applications pin A is the ground pin and is consistent with the AUDIO use of this connector. FASCINATOR – approved for use with the MCX-100, NX 300, Portable Repeater, SABER, SPECTRA, SYNTOR X-9000, SYNTO X-9000 E, Console Interface Unit, and SPECTRA Mobile SVMS. If the KYK-13 Electronic Transfer Device can be used then the KOI-18 Tape Reader should also work. FM24-19 Chapter 4 indicates that the KOI-18, when loading a KY-57 has a parity check.
This may also be the case for the SVM. Can the key be read from a keyed SVM? Is there a hardware handshake between the key loader and the SVM? This might also be called an initiate command and a key accepted handshake. To start the load the PTT is pressed on the KY-57, then how to initiate a load on the SVM? SVM is being loaded without the radio maybe bringing pin A up to the power supply voltage would have the same effect.
If pin A was always high then just plugging the SVM onto the CSD-68 fill gun would start the key load. Caution: When installing the SVM onto a radio the SVM housing should seat very close to the radio module cover. If there is a big gap the SVM 15 plug may not be mating with the radio 15 pin socket. But J3-7 Radio SVM Squelch disable is dynamically pulled to ground by the SVM.
3 each 675 Zinc Air hearing aid batteries? The positive end of the batteries goes into the battery compartment first,this is the flat end. The 675 hearing aid batteries are a close fit and require good alignment then they just drop in. Parts of the System PCG-68 – Programmable Code Generator makes the key and is used to load it into the . Maybe a PIC microcontroller can be programmed to load the key.
WANTED – information about the key length, headers, check sum, etc. PRC-126, -128, -136 and 68A, 68B? How does the radio detect that the SVM is installed? This description is not correct since the SVM jumper plug has no contact in position 8, i. IF module J2-3 is marked NC and this is confirmed by the VHF low and high band schematics that show n. 5 so it’s a TTL line.
There is a 1 M Ohm resistor to ground on the uC side of the 47 k Ohm series resistor in the secure voice detect line. This would cause the uC to see a ground when no SVM were present so having the SVM ground pin 8 to indicate it’s presence would not work. Tx cipher can be routed to 1-J “secure voice detect” and directly into the microprocessor for digital data? Another possibility is that there is some provision for a factory test mode that works through the SVM connector. The illustration below shows the top of the SVM with only a 15 pin connector to mate with J1. The Rx audio has a low pass filter to reduce the noise that comes with non secure audio in a wide bandwidth. 77 have a connector marked “POWER” that also has a jumper plug attached when not using the crypto equipment The jumper only routes DC power, not any audio signals.
77 then the internal battery is disconnected and the radio needs to be powered through the POWER connector by the external equipment. SVM is seperated from the battery and the hold up batteries have been removed for the SVM. Be very sure the switch is in the ON position before connecting the SVM to a battery. COMSEC module used to secure digital voice or data traffic. 58, E-DRZ, KYV-2, KYV-5, KG-84, RAILMAN, INDICTOR, and STU-III. 58, KYV-5, INDICTOR, and RAILMAN equipment.
jvans1 commented Dec 17, 2017 • edited Edited 1 time jvans1 edited Dec 17, 2017 (most recent)
KY-57 and other voice scramblers the Marines had a test built to measure the actual BER over real radio links. Changed patent links to USPTO stable format. Theory NSA -The Start of the Digital Revolution: SIGSALY Secure Digital Voice Communications in World War II – Although the patent application was filed in 1941 it was granted in 1976! Secret telephony patent number 3967067 is the start of digital voice encryption.
The primary AF-1 high level voice link is the secure UHF military tactical satellite voice system. 58 and -2 use CVSD Continously Variable Slope Delta to convert voice to digital data. Post Vietnam KY-57, OTAR, SICGARS Patents The KY-8, KY-28 and KY-38 were fielded during the 1960s Vietnam Era and were replaced shortly after that with the KY-57, KY-58, KYV-2 type equipment. So patent filing dates in the 1960s might cover it’s features. Seems like a late filing, or there was prior art. 2964856 METHOD OF AND APPARATUS FOR CRYPTOGRAPHY, Albeit W. 58 Note the 19 year delay in issuing the patent.
2984700 METHOD AND APPARATUS FOR CRYPTOGRAPHY, Albert W. Note the 17 year delay in issuing the patent. Shannon’s paper in the Bell System Tech Journal Oct 1949. 2878316 MULTI-CHANNEL COMMUNICATION SYSTEM, Wilson P. 3188390 SIGNAL TRANSMISSION WITH SECRECY, Miltoa E. Notice 22 year delay in issue date.
Pseudo Random Code and XOR gate Another possible implementation would be to use some type of pseudo random code generator and exclusive or it with a digital form of the voice signal. This would need some type of header to sync the receiver to the transmitter. 3893031 :Synchronization system for voice privacy unit – A system for synchronizing the operation of two or more voice privacy units. At least one otherwise “clear” tone is modulated by a statistically random signal known as a Barker word, this tone then being mixed with the audio signals and transmitted.
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3808536 :COMMUNICATION SCRAMBLER SYSTEM – A scrambler system in which amplitude zero-crossings in speech are encrypted at a transmitter by combination with a pseudo-random digital sequence, the reverse process occurring at the receiver. The amplitude envelope need not be encrypted, but if desired, can be encrypted by combination with a further pseudo-random digital sequence. Loading Secure Device – a KYK-13 or KYX-15 key transfer device is used to load the KY-57. Kits for General Purpose Use and Shelter Applications. TSEC is not the KY-57 but is a radio to wire interface. KY-57, and wrap them in an additional waterproof bag.
Before a mission, always place fresh batteries into your communication gear and sensors, especially the BA-1372 memory battery for the KY-57. Always carry spare PRC-77 and KY-57 batteries, but do not remove the spares from their plastic wrapping prior to use, or they may lose power. The KY-38 voice security unit was designed to work with the MRC-108 FAC jeep, ARC-51 aircraft radio and VHF squad radios like the PRC-25 and is part of the Nestor family. The corresponding airborne unit was the KY-28.
SINCGARS NRZ IAW 16k bps Russian web page – FM 24-24 Chapter 6 Section VI. CSZ-1A Sunburst II processor provides high grade half-duplex secure voice and data communications over wideband and narrowband communications links. Its flexibility and modular construction allow for future expansion to incorporate additional COMSEC equipment testing capabilities. The tactical protocol supports communications over COMSEC devices and radios like the SABER, SINCGARS, PSC-5, MSHR, KY-57, KY-58, KY-99, and KY-99A. VHF transceivers to a digital cryptographic voice and data communications system.
Electrical and mechanical interfaces ensure direct replacement for U. Radio Set in a ground configuration. TSEC electronic Transfer Device with fill cable, SOI. Effects of Tandeming on Voice Quality and Intelligibility – Tandems occur whenever the output of one type of voice coder is used as input for a second coder. Technical Communications Corporation bought Datotek – Technical Discussion On Voice Encryption Methods – the following TCC patents all appear to be analog methods as described in the Tech Disscussion. Essentials of 2-way Radio Scrambling – all their models are based on various forms of frequency inversion. MSC2001 Voice Encryption Unit This is a similar unit that was made by Seimens in Germany and holds 8 keys.
There are plans for a keyloader for this unit that requires getting the clock signal from a serial port and feeding it into a “Keybox” that gets the clock and RS-232 data aligned properly and will load the MSC2001. For use with mil radios that support wide band audio like the PRC-77. Back to Brooke’s Crypto, PRC-68, Military Audio, Squad Radio, Military Information, Home page This is the time this page has been accessed since since 9 May 2001. United States Navy Information Systems, Afloat and Ashore. It links the computer and the data terminal set. NSA memo of 12 Jun 98 applies. C are cryptographic equipment developed to ensure secure transmission of digital data.
The KG-84A is primarily used for point-to-point encrypted communications via landline, microwave, and satellite systems. KG-84, P4110-477 dated 5 October 86, KG-84C, P4110. WALBURN Family devices are certified to encrypt and decrypt up to TOP SECRET. 95 and KIV-19 do not process, store, or utilize a date in their operations. NSA memo of 18 Dec 97 applies. The KIV-7 provides security protection through TOP SECRET, dependent on the classification of the fill key. The KWR-46 is a low-level device that performs on-line decryption of digital message, record, and data traffic received over the fleet broadcast system at data rates from 50 bps to 9.
6 kbps in asynchronous, stepped, or synchronous modes. Type: The EIP is a single 6U form factor VME board, mounted in a host chassis containing other VME boards performing host system functions. Follow the guidelines for the host system. FASTLANE provides an effective solution because of its ability to take advantage of ATM’s bandwidth-on-demand services.
FASTLANE supports a variety of communication modes with flexibility and robust key management. FASTLANE Release 1 and Release 2 are “Not Compliant” with Y2K only because the display in the front panel of the FASTLANE does not display correctly beyond Year 2000. FASTLANE operation has no problem with Year 2000 issue. Release 1 and Release 2 are no longer available. FASTLANE data rates may be modified with the purchase of a replacement line card kit. The Navy centrally procures INE and requests to CNO N643 will result in issue without cost to program to validated users.
It provides optical transport at both the RED and BLACK interfaces to communications systems. Year 2000 compliancy to be determined. Follow the repair guidelines for the host system. The CORNFIELD is software programmable providing flexibility for future algorithms and backwards compatibility for existing algorithms. All algorithms and keys can be loaded through the DS-101 or DS-102 fill port interfaces and can store up to 8 algorithms and 64 keys. PEIP will support multiple algorithms by associating keying material with algorithms in a channel. Size: PEIP is a single mezzanine board installed on a 6U form factor VME board and mounted in a host chassis containing other VME boards performing host system functions.