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comment The use of cribs
This was closed two years after I asked it? That's... weird.
comment The use of cribs
@Paulo I have updated my question. But I would like to point out a few things in case my new question is too long for your tastes. You say it's not interesting because of Kerckhoff's Principle - yet historically many countries have broken many other countries' encryption schemes. And they spend millions of dollars doing so. Now, we have things like RSA, El Gamal, etc - this is true. But it was not always true, and I am shocked that you think we should discount all history and historical code breaking because of a few schemes that we are pretty certain are hard to break today.
comment The use of cribs
@Paulo If you are asking me, do I personally have a great need to break unknown schemes, then the answer is no. I do want to learn how this was historically done. And to be honest, I'm a graduate mathematician at Brown, and I have a group of friends that creates ciphers for the others to break. So in a sense, yes, but it's not imperative.
comment About Cryptography in a Character Language
Unless I am mistaken, Japanese and Chinese are completely different written languages, functionally speaking. The various Japanese kana alphabets are entirely syllabic and phonetic. Although they have more than 26 characters, they only have 48 each. Chinese is typically written via pictograms and ideograms, and there are dozens of thousands of different symbols. I am very familiar with Codebreakers and Japanese ciphers, but I do not think that such techniques lend themselves easily to Chinese. But I do not know much about Chinese, so perhaps I am wrong.