Like, say, you are a revolutionary who’s imprisoned, but you are allowed to write letters to your family. How would you covertly send a message to your fellow revolutionaries that only they can decode? (Your family are on your side will pass the letter along)
Obviously, it cannot appear to contain any obvious ciphertext, since the prison guards would just rip up your letter and not send it.
Encode you message as the second letter in ever word. “Coded message” could be: “actually, your odd text added small fears as ester calls, egg deficiencies…”
In prison, you’d have plenty of time to choose more natural sounding words.
It could be anything, as long as your recipient has the cipher for your code. If they don’t, then you better hope they’re really good decrypters.
Your options depend on how much code you can agree on. Ask about imaginary relatives map each name to a meaning, so asking about the health of Aunt Judy could mean that the prison refuses your access to a lawyer and telling you thought about Uncle Sam could mean they keep you in solitary. Or whatever facts you want to communicate. Your revolutionary friends could respond in the same manner. The flaw is in being limited to previously agreed upon code words.
If you have access to a common book, you can refer to words by page, line and word number. You could embed the numbers as words in a story you are writing to your (imaginary) child. “Behind the seven hills, there were five houses with nine rooms each” can translate to “take the 9th word on page seven, line five”. Obviously you need the exact same copy of the book for this to work, the Bible is quite common for this cipher.
Um yea… about the code book idea…
It’s prison… all of your posessions would be confiscated
You would literally have to memorize all the ciphers
Prisons have libraries
You usually get the book corresponding to your faith, so that would be an option. Given that the Bible (can’t speak mich about it but way less about the others) has chapters and verses and what not, addressing single words is simple.
For the “name of relative is the code”, yeah that needs a good memory.
There are hundreds (at least!) versions of the bible, and that’s just in English. Would have to make sure it’s exactly the same one.
“Request for a bible granted, here is the latest version of trump bible, newly edited just yesterday.”
🙃
Learn to write in Toki Pona? Its vocab is 120 words. Maybe someone out there could recognize that it’s a language and go from there. Edit: the revolutionary would have to know the language first, if you mean without prior knowledge of anything, that’s rough. it’s too conspicuous anyway I got nothing
It looks like a code even when not trying to.
Yeahh lmao
The concept for this is called Steganography and that article has several examples, but most would be difficult without tools/references.
The easiest would be stuff like using certain letters of words or word lengths as mentioned in some other comments here.
If you’re important enough they won’t let you send letters at all.
If you’re unimportant, well anything you agreed on beforehand should be okay.
I mean it really depends on how much trouble you’re in. If you’re in deep they’re gonna be watching every thing you do no matter what. So any kind of message that looks suspect is gonna be investigated, even stuff like “Aunt Mary” or whatever is gonna have someone trying to figure it out.
The best way to do it is to exit the monitored communication entirely, either a burner phone with coded language, or having your communications come from someone else on the inside. That’s really the only way you’ll get around it, and even that can still be caught.
Just use a contraband cellphone. That gives you access to powerful encryption.
I’d probably go with metaphors and callbacks.
“Do you remember that one time we went to the pier?” and make up a story or something that can be re-interpreted. IDK if that’s very good.
