🔐 CIPHER AUTOPILOT LAB

SIGINT TRAINING / STRUCTURED NUMERIC TRANSMISSION ANALYZER

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CLASSIFICATION

Educational / Cryptographic Training Use Only
No Operational Decryption Capability Against Proper OTP Systems

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MISSION STATEMENT

Cipher Autopilot Lab is a structured cryptanalysis environment designed for:

• Training exercises involving numeric radio transmissions
• Analysis of structured message formats
• SIGINT laboratory simulation
• Demonstration of statistical cryptanalysis principles

This system evaluates ciphertext integrity and cipher characteristics without requiring operational key material.

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OPERATIONAL CAPABILITIES

1. STATISTICAL ANALYSIS

• Shannon entropy calculation (digit domain)
• Frequency distribution analysis
• Repetition detection
• Index of Coincidence (IoC)
• Kasiski-style repeat factor hints

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2. AUTOMATED HYPOTHESIS TESTING PIPELINE

The system executes sequential evaluation of:

• Grid 00--99 decoding
• Vigenere (mod 26) -- English scoring
• Vigenere (mod 33) -- Russian scoring
• Heuristic numeric Vigenere (mod 100 pairs)
• mod10000 constant-shift scan

Each hypothesis is evaluated using structured scoring models.

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RUSSIAN TEXT HEURISTICS

• Cyrillic character density
• Military lexicon detection
• Bigram frequency modeling
• Weighted plausibility scoring

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COORDINATE / FIELD FORMAT DETECTION

• Latitude / Longitude patterns
• Grid-style numeric clusters
• UTM indicators
• Directional markers (N/E/W/S)
• Military numeric formatting detection

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EXPECTED INPUT FORMAT

Example structured transmission:

NZhTI 27141 RYBOLOVNY 4490 1101
TsZhAP 14750 KOLOMENKA 8348 5727

System automatically parses:

PREFIX | MESSAGE ID | CODEWORD | NUMERIC GROUPS

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ANALYTICAL INTERPRETATION GUIDELINES

High Entropy (~3.32) + Zero Repetition

Likely: - One-Time Pad - Proper Stream Cipher - Single-use Codebook Indexing

Elevated IoC at Specific Key Length

Possible: - Periodic key cipher - Weak repeating-key structure

Russian Plausibility Score Triggered

Possible: - Correct partial decryption - Linguistic alignment

Coordinate Score Triggered

Possible: - Field report - Position reference encoding - Military grid transmission

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LIMITATIONS

• Does not brute-force OTP
• No genetic/hill-climbing cracking engines
• Requires sufficient ciphertext length for reliable statistical modeling
• Cannot recover plaintext from properly keyed OTP systems

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SYSTEM EXECUTION

Requirements: Python 3.9+

Execution:

python cipher_autopilot_full.py

No external dependencies required.

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STRATEGIC VALUE

Cipher Autopilot Lab demonstrates:

• Why OTP encryption remains unbreakable without key reuse
• How statistical metrics reveal structural weaknesses
• How structured radio formats influence cryptanalysis
• Practical SIGINT-style analytical workflow

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DEVELOPMENT STATUS

Operational -- Training Environment
Extensible -- Modular Heuristic Architecture
Designed for controlled laboratory environments

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