Encryption of content message
The content message m is encrypted using JWE (JSON Web Encryption), resulting in the following flatten structure:
The "ciphertext" property is calculated by symmetrically encrypting m with the content key CEK. CEK is a unique key, which is then encrypted using PKB and stored as the "encrypted_key" property. Only those with access to the corresponding SKB can decrypt the "encrypted_key" and subsequently decrypt the "ciphertext" to reveal the original message m.
The "protected" property contains an encoded JSON structure specifying the encryption algorithms used:
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