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I am building a plain Text Editor that allows to encrypt, hash or sign passages. Since I want to allow for different Methods (symm/asymm, #Bits etc.), possibly even within the same document, the actually Method used must/should be documented in the same document, preferably directly before the encrypted passage.

I wonder if there is something like a standard plain text Prefix (or Suffix) for encrypted data/signatures similar to the protocol in a URL http:// or mail:// . The concatenated prefix and cipher (base64 encoded, also the encoding should go into the prefix) could look like this:

SHA1://XFe..ks== or 
RSA512://uD4lo...df5= 
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You might be interested in RFC 3369, the Cryptographic Message Syntax standard. It includes the relevant metadata which describes the information you're seeking.

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  • Thanks, that seems already very detailed and I couldn't find an annotated version of this RFC. Even Wikipedia has only minimal Information: en.wikipedia.org/wiki/Cryptographic_Message_Syntax How would this look like in practice?
    – Spoc
    Commented Aug 22, 2016 at 16:30
  • The Windows CryptoAPI directly supports CMS, aka PKCS#7. You could start there, if you're on that platform. Also, see RSA's documents on PKCS#7. They have better examples than the RFC. Commented Aug 22, 2016 at 16:36
  • Actually yes, I'm on Windows.NET using CMS and obtain a base64 cipher or hash, but I would like to adorn the result with a Prefix to tell readers which Encryption or hashing was used.
    – Spoc
    Commented Aug 23, 2016 at 6:58
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    There are no standardized text prefixes that meet your requirement. But then, you aren't exactly working with standardized files, so you can do what you need. Take a look at the ASCII-armored PGP file format. The first line parsed starts with ----- BEGIN PGP MESSAGE ----- which is followed by a Version: line, then the base64 encoded details. You could mimic this syntax, and include an Algorithm: line, for example. Commented Aug 23, 2016 at 13:43

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