Help with OTP encryption

[Philip Taylor]

N. Andrew Walsh wrote:

> I have a TeX document in which each character has been converted to 
> one of 52 two-digit numbers (so, 01 through 52). [...] However, since 
> these are TeX documents there are tags, markups, footnotes, citation 
> links, etc. still in the document.

When you say "each character", what exactly do you mean ?  I assume that 
"a" is a character, and "Z" is a character (whence the 52) but is "0" a 
character ?  Or "9" ?  Or any of "\", "{", "&", "}", etc. ?  And are the 
characters converted no matter whether or not they form part of a 
control sequence ?  More information needed, I feel.
-- 
/Philip Taylor/
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