flaw - garb
- flaw
- flaw in the encipherment
- flawed
- flawed cipher
- forced
- forced key change
- foreign
- foreign communications
- Foreign Intelligence Surveillance Act
- Foreign Intelligence Surveillance Appeals Court
- Foreign Intelligence Surveillance Court
- forge
- forge a certificate
- forge coded signals
- forged
- forged message
- format
- formula
- Fort Meade
- Fortezza
- forward
- forward asymmetric encryption
- four four-wheel Enigma
- four-
- four-square cipher system
- Fourier
- Fourier transform
- fraudulent
- fraudulent ciphertext
- fraudulent cryptogram
- fraudulent message
- freely
- freely-selected key
- French
- French diplomatic communications
- frequency
- frequency distribution
- frequency division multiplexing
- frequency hop inverter
- frequency inverter
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