Secure(r) Communications for Ham Operators

Amateur radio communications is not a private or secure method of communications. Anyone with a scanner that will pick up signals in the amateur bands can hear our conversations.

However...

According to FCC rules, operators are not allowed to encrypt their radio signals for the purpose of disguising the content of the message, with only the exception of sending control signals (vs person-to-person messages). The use of spread spectrum transmissions is allowed in certain bands, but again, not with the intent of obscuring the meaning of the communication; it is primarily a method for reducing interference and providing multiple uses within the band.

So, can amateur operations be secure? Technically, no. But there are ways operators can decrease the likelihood that unsavory listeners will glean information we don't want them to have. 

One of these practical methods is to use the same precautions when conversing as you would when using social media. That is, don't discuss personal, personally identifiable, or otherwise sensitive information on the air. Don't talk about your upcoming vacation, when your house is likely to be empty and unguarded. Don't share anyone's personal address, phone number, date of birth, etc. Let caution be your guide.

One bit technology available to amateur operators that is essentially private is Winlink, which is a worldwide radio messaging system that uses amateur-band radio frequencies to provide radio interconnection services that include email with attachments, position reporting, weather bulletins, emergency and relief communications, and message relay. This operation method is also great for getting messages out to loved ones who are not hams during an emergency when other forms of communication may be cut off.

Using any email, including Winlink, you can also send a text (or Short Message Service - SMS) to a cell phone, which is likely to result in messages being more timely received. To send an SMS message, you need to enter the recipient's cell phone number and their carrier's SMS domain in the To: line of your email. You can reference the Text Message Via Email document for carrier email domains. You can also ask your contacts to send you an email via their SMS application and keep record of it for future use.

But even then, keep in mind that there are entities that may be able to gain access to these stored communications via security breaches or through court orders. The only true secure communications are private face-to-face conversations.

Side note: The FCC recently published Enforcement Advisory FCC Public Notice DA 21-73"to remind licensees in the Amateur Radio Service...that the Commission prohibits the use of radios...to commit or facilitate criminal acts.

Presented by Don W7PJ at the regular monthly club meeting on February 4, 2021.