This is an automatic link setup (ALE) and traffic forward performedthrough the use of MIL-STD standards 188-141A and 188-110A Serial Tone: the calls in the play belongs to Romanian Military, the trasmission has been caught on 8000.5 KHz on USB.
Since the encryption is visible in the secondary protocol (or better, at data-link layer), as seen in the KG-84 detection we need a bitstream that is de-encapsulated from MS188-110 (the used physical-layer in this case) stuff. I used Sorcer to decode the received signals (pic. 1): as you can see, they were sending data at 300bps with long interleaving. Some logs in the web report the pattern "]]]VVV" as a sort of footprint related to Citadel encryption: maybe this is true for 2400bps/voice transmissions since I could not find any particular "pattern" in the ASCII outputs. The secondary protocol (pic. 2) is identified as Harris FED-1052 and it's not an error since MS188-110 has been removed by Sorcerer and so probably it's related to the data-link layer specified by this protocol. As you can see, the encryption is easily detected.
In pic.3 I drewasimpleand unpretentious diagram to illustrate how all the stuff works, if you understand TCP/IP then it will be easy for you.
In pic.3 I drewasimpleand unpretentious diagram to illustrate how all the stuff works, if you understand TCP/IP then it will be easy for you.
"The Citadel cryptographic engine provides military-grade encryption for non-Type 1 applications for U.S. and international users. It is approved for export with configurable key lengths and multiple algorithm options, making it an ideal encryption solution for a broad range of modern communications products. Citadel has three algorithm options: a standard Citadel high-grade algorithm; a Harris-configured, customer-unique Citadel algorithm; and a customer-configurable unique Citadel algorithm. All Citadel cryptographic algorithms are based on a mixed-mode, arithmetic block cipher and support both communications security and transmission security functions."
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