On Sat, Apr 19, 2025 at 6:03 AM Alessandro Vesely <[email protected]> wrote:

>
>
>
> Transparent transformations, such as base64 encoding, must be recognized
> as
> such by the algebra.  Alternatively, we could require that hashing be
> performed
> on the decoded content, but this would be a gratuitous incompatibility
> with DKIM1.
>
> Signers should avoid signing quoted printable stuff, as its many possible
> variations make any further conversion irreversible.  Base64 encoding is
> reversible as long as column width is 76 characters.  I'm saying this
> after
> coding it —zdkimfilter 3.0 (nov 2020) included reversing MLM
> transformation,
> which is unreliable as it misses a modification algebra.


 Can you expand upon the risk of using quoted printable with text algebra?
-Wei
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