When I was younger I used to try not to subvocalise (?) my computer passwords, thinking that might stop someone reading my mind. Might start that again
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Nasa had an article[0] back in 2004 where they could detect what you were saying with sub vocalization on the skin and were already working on technology to read it through cloths back then, so not to get too tinfoil hat but that might not be all that bad of an idea.
[0]https://www.nasa.gov/home/hqnews/2004/mar/HQ_04093_subvocal_...