KY-3
Secure telephone system
general/national-security-agency-encryption-devices
Fortezza
Information security system
general/national-security-agency-encryption-devices
STU-II
Secure telephone
general/national-security-agency-encryption-devices
KW-26
general/national-security-agency-encryption-devices
KG-84
Encryption device
general/national-security-agency-encryption-devices
STU-III
Telephone
general/national-security-agency-encryption-devices
KW-37
general/national-security-agency-encryption-devices