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From: Rich <rich@example.invalid>
Newsgroups: sci.crypt
Subject: Re: [base64+]
Date: Mon, 30 Dec 2024 20:37:52 -0000 (UTC)
Organization: A noiseless patient Spider
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Stefan Claas <pollux@tilde.club> wrote:
> Hi all,
> 
> while no encryption, this is an enhanced version of a standard
> base64 encoder/decoder.
> 
> It writes the filename, file size and SHA256 hashsum as a Header,
> like in this example:

So, somewhat like an 'extended' uuencode.

https://en.wikipedia.org/wiki/Uuencoding