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Add compression to the S/MIME class as per RFC 5751

Posted: 02/18/2016 08:37:17
by VoxPopuli Robot  (Team)

S/MIME is currently defined by RFC 5751 (S/MIME v3.2). The primary difference is a new CompressedData content type. The sender can compress the message and attachments at message compose time, then encrypt the result. Once encrypted, it is essentially impossible to compress a message, as compression depends on patterns which are destroyed by encryption. Upon receipt, the message is decrypted and then the compressed message expanded.

The intent is to reduce the size of mail messages, and hence the time required for transmission.

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