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How long can a SCIP encryption hold up at MELP data rates before repeating?

Reference

The old MELP and the new MELPe are interoperable and both operate at 2400 bit/s, sending a 54 bit data frame every 22.5 milliseconds but the MELPe has optional additional rates of 1200 bit/s and 600 bit/s. 2400 bit/s MELPe is the only mandatory voice coder required for SCIP. Other voice coders can be supported in terminals.

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everything.explained.today

SCIP was designed by the Department of Defense Digital Voice Processor Consortium (DDVPC) in cooperation with the U.S. National Security Agency and is intended to solve problems with earlier NSA encryption systems for voice, including STU-III and Secure Terminal Equipment (STE) which made assumptions about the underlying communication systems that prevented interoperability with more modern wireless systems. There are several components to the SCIP standard: key management, voice compression, encryption and a signalling plan for voice, data and multimedia applications. 2400 bit/s MELPe is the only mandatory voice coder required for SCIP. For security, SCIP uses a block cipher operating in counter mode. For Type 1 security, SCIP uses BATON, a 128-bit block design.

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www.wikiwand.com

MELP was itself derived from another military coder, LPC-10. However, MELP originally only specified a 2400 bps mode of operation. MELPe is a triple-rate low codec that supports rates of 600 bps, 1200 bps, and 2400 bps. A MELPe frame interval is 22.5 ms in duration and contains 180 voice samples, at a sampling rate of 8,000 kHz.

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wiki.radioreference.com

OpenAI's Answer

SCIP (Secure Communications Interoperability Protocol) typically uses the MELPe (Enhanced Mixed Excitation Linear Prediction) codec for secure voice communication. Here are some key details:

  1. MELPe Codec Rates: The MELPe codec operates at several bit rates: 2400 bps (bits per second), 1200 bps, and 600 bps. The 2400 bps is the only mandatory rate for SCIP usage, but it can optionally support the lower rates for different operational needs.

  2. Frame Duration: Each MELPe frame is 22.5 milliseconds long and contains a specific amount of voice data, such as 180 voice samples at a sampling rate of 8000 Hz.

  3. Encryption Use in SCIP: SCIP utilizes a block cipher operating in counter mode for encryption purposes. At lower data rates utilized by MELPe like 600 bps or 1200 bps, SCIP's encryption mechanisms ensure secure communication over narrow bandwidths, optimized for operational environments where secure, low-rate communication is critical.

However, the search did not specifically address the cycle or repetition period for SCIP encryption within these data rates directly. For practical purposes, secure communication protocols like SCIP are designed to operate continuously without needing to repeat an encryption cycle within typical operational timeframes. The precise cycle would depend on the key length, the specifics of the block cipher employed (like BATON), and the mode of deployment but is often designed to be effectively infinite in operational contexts.

For further technical details or specific implementations, consider consulting dedicated protocol documentation or resources from organizations like the Department of Defense, which have implemented SCIP standards.

For more specialized information, you may refer to SCIP on Wikiwand and everything explained about SCIP.

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