Batboard

Digital Voice International

The unique encryption protocol known as DVI-XL (Digital Voice International) is based upon the DVP-XL algorithm. There is some contrary information in the public domain regarding the encryption key length of DVI. Some documents say 24 bits, some documents say 32 bits. Since DVI-XL is based upon DVP-XL, I am going to assume that the key length remains the same as DVP-XL at 96 bits.

Many people have speculated that since DVI was destined for the international marketplace, there is a hidden back door into this protocol. Of course, no one knows this with any certainty, but it would make sense.

DVI is unique as it requires what is called a “system key” to 14 March 2006 First Draft function and uses two different keyloaders for loading encryption keys in subscriber radios. The DVI-XL system key is completely different from the system keys used to prevent unauthorized access to trunking systems. The DVI-XL system key consists of a 128 bit key variable that is loaded into the keyfill device in addition to the encryption key. There are two different KVLs for DVI-XL, the T3012 and T3013. Each is capable of loading a subscriber radio, but the T3013 “Operator” model is NOT capable of entry of the key variable data. The T3012 is referred to as the “Supervisor” model and allows key data entry.

To load a T3013 loader with keys, you must clone the key data from either another T3013 or a T3012 Supervisor KVL. DVI-XL is not a common algorithm and is rarely seen in the used marketplace.

To program a key into KVL:

1. Turn on the KVL 2. Press the LOAD button 3. It will prompt for the sequence number (0 to 7) 4. Press 0 for the first memory location 5. Prompt is 0.1 for the first set of octal or hex values 6. Press random values for the key, noting them on paper as you go 7. After 16 to 24 digits it won't take anymore digits (sometimes the last digit will not take, try another if "E" shows) 8. Press ENTER button to save the key into loader 9. NOTE The KEY # is NOT retrievable from the loader
To program key into radio:

1. Connect radio to KVL with appropriate cable 2. Turn on the radio 3. Turn on the KVL 4. Press the PTT (push-to-transfer) on KVL
At this point, the KVL will send the encryption key to the radio. It only takes a split second. The KVL will now send a 1000hz encrypted tone to the radio, and if all is successful, you'll hear the tone from the speaker. On some of the KVL's, there is a signal sent back from radio to KVL and it will display "PASS" for "FAIL" on the display. Other's will display "BEEP" only as a reminder to make sure the decrypted tone was present in the radio.

The key inside the radio is volatile, meaning that if you disconnect the battery while the radio is on, the key is lost. If the radio is off and you disconnect the battery for more than about 30 seconds, the key will be lost.

Romario wrote:P.S. I also noticed he started his post with "Hello".

Pj wrote:

Digital Voice International

The unique encryption protocol known as DVI-XL (Digital Voice International) is based upon the DVP-XL algorithm. There is some contrary information in the public domain regarding the encryption key length of DVI. Some documents say 24 bits, some documents say 32 bits. Since DVI-XL is based upon DVP-XL, I am going to assume that the key length remains the same as DVP-XL at 96 bits.

Many people have speculated that since DVI was destined for the international marketplace, there is a hidden back door into this protocol. Of course, no one knows this with any certainty, but it would make sense.

DVI is unique as it requires what is called a “system key” to 14 March 2006 First Draft function and uses two different keyloaders for loading encryption keys in subscriber radios. The DVI-XL system key is completely different from the system keys used to prevent unauthorized access to trunking systems. The DVI-XL system key consists of a 128 bit key variable that is loaded into the keyfill device in addition to the encryption key. There are two different KVLs for DVI-XL, the T3012 and T3013. Each is capable of loading a subscriber radio, but the T3013 “Operator” model is NOT capable of entry of the key variable data. The T3012 is referred to as the “Supervisor” model and allows key data entry.

To load a T3013 loader with keys, you must clone the key data from either another T3013 or a T3012 Supervisor KVL. DVI-XL is not a common algorithm and is rarely seen in the used marketplace.