Encrypted Message Structure

4. “application/pkcs7-mime” With Transfer Encoding

3. CMS Enveloped Data

2. Transfer-Encoded MIME

MIME Canonical Form

1. Original MIME Entity

Other Required Data

• Step 4: Insert the CMS object into a new MIME entity

• Step 3: Create CMS enveloped-data object (details later)

• Step 2: Convert to transfer-encoded, canonical MIME entity

• Step 1: Prepare the original MIME entity as usual

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