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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