Espionage

:Spy and secret agent redirect here; for alternate use, see Spy (disambiguation) and Secret agent (disambiguation).

Espionage technology and techniques

:Main article list of intelligence gathering disciplines.

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• ECHELON
• Agent Handling
• Black Bag Operations
• Concealment device
• Cryptography
• Cut-out
• Dead drop
• Eavesdropping
• False flag operations
• Honey trap
• Interrogation
• Nonofficial cover - NOC
• One Time Pad
• One Way Voice Link
• Steganography
• Surveillance
• TEMPEST — Protection devices for communication equipment.