Second draft of the Kullo Letter Model

Kullo Letter Structure

letter receiver address
symmetric (RSA encrypted) algo string key string iv string
messageContainer (encrypted)
message (compressed)
header type enum to string cc string bcc string from string subject string date datetime letterId string[0-9a-Z] inReplyTo string
imprint name string rank string company string logo file comments text
item name string mime string start int length int
messageDigest string messageSignature string
attachmentsContainer (encrypted) attachedTo MessageId attachments List<Attachment> attachmentsDigest string attachmentsSignature string

Kullo Attachment Structure used within a Letter

Attachment data blob name string mime string length int

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