What is the purpose of cryptographic systems in secure communications?

• A. To guarantee faster transmission
• B. To allow discussion of classified information on an open net
• C. To simplify unit identification
• D. To increase broadcast range

Answer: (B)

Cryptographic systems exist to protect information so it can be communicated securely over open or untrusted networks. By turning plaintext into ciphertext with cryptographic keys, only those with the right key can read it, while the rest see meaningless data. This enables discussing sensitive or classified information over an open network with confidence that outsiders can’t read or tamper with the message. It’s not about speeding up transmission, identifying units, or increasing the broadcast range—the goal is to preserve confidentiality, and often integrity and authenticity, of the communication.