In maritime communications, authentication primarily helps prevent which risk?

• A. Impersonation of the sender
• B. Data rate reduction
• C. Frequency drift
• D. Antenna misalignment

Answer: (A)

Authentication in maritime communications is about confirming the sender’s identity to ensure the message truly comes from who it claims to be. When authentication is in place, someone cannot pose as a legitimate transmitter and inject false information, which directly reduces the risk of impersonation. Other options relate to physical or technical issues rather than identity verification: data rate changes come from channel conditions and protocol overhead, frequency drift stems from oscillator stability and radio tuning, and antenna misalignment is a hardware/installation problem. So, impersonation of the sender is the risk authentication is designed to prevent.