using digital communications can create even greater security, and it is easy to fix it so a computer can transmit over a radio as well, though it is against the law on most radio services. and encrypting the message is MOST CERTAINLY against the law, but chances are after z-day, not many people will care about that.

all you need is a laptop, an interface, and a radio.

some digital modes are even able to detect and use signals that you as the radio operator can not even hear. According to some of the information I have read, there have even been successful experiments to use these digital modes to bounce a signal off the moon allowing you to communicate with anyone on the same side of the planet as you.

using an encrypted message in adiugital communication mode only requires typing out your message, encrypting it, then cut and pasting the message into your communications software.

there have been some experiments using such systems on FRS radio systems to make portable communications systems. Additionally you can use a GPS and software called APRS to create a position tracking system.

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