Impenetrable Cypher Approach
From DivNull RPG
Cost: 10 motes, 1 Willpower
Min. Linguistics: 5
Min. Essence: 3
Source: Sol Invictus
Prerequisite Charms: Subtle Speech Method
Summary: Write or speak a message that only those you select can understand.
Using this charm, a Solar may create a code or cypher which only those she selects may understand. The character must specify a spoken or written code, and identify a number of companions who will be able to understand it; no more companions may be selected than the exalt’s permanent Essence. As long as the motes remain committed to this charm, the solar and any allies she selected may speak or write in the code, secure in the knowledge that prying eyes will be unable to penetrate it. Although those who observe it will generally be able to determine that an encoding is being used, the specific details are nearly impossible to draw out. This charm serves as a perfect defense against mortal attempts to break the cypher, and even magical effects suffer an increase in difficulty equal to the characters permanent Essence.
Knowledge of this charm can be gained from the following sources: