I have a few questions for implementors. First some background, then the
The use of S/MIMEv3 Triple Wrapping leads to the incorporation of four MIME
encodings. If each of these encodings uses Base64, then the overhead is
huge. I am interested in ways to reduce the overhead, hopefully without
hurting IMAP usability.
1. Can your implementation handle
MIME( SignedData (EnvelopedData (SignedData ( MIME ))) ?
The outer SignedData has the OID for EnvelopedData in the content type, not
The EnvelopedData has the OID for SignedData in the content type, not id-data.
The inner Signed Data has the id-data OID in the content type.
2. Can your implementation handle MIME without Base64 encoding? I am
interested in using "binary" instead of Base64 to reduce the overhead.