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In this video tutorial, Cecilia Radio explains how to send private messages using a technique called a one-time pad, a skill essential for radio operators and preppers. The method can be executed via radio using Morse code or digital modes, or simply with paper and sound. The one-time pad is noted for its unbreakability, as its output is as random as the pad used for encoding, making it impossible for anyone to decipher. However, both the sender and recipient must possess a copy of the pad, which must also be completely random to ensure security. Cecilia will discuss various ways to utilize this technique effectively.