SecExMail messages are transferred in base64 encoded format. Messages may be encrypted to multiple recipients. The internal message layout is defined as follows :
| [<rsa bytes>:<recipient>]key[<rsa bytes>:<recipient>]key...cipher text
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| This is the size of the recipient's RSA key in bytes. Therefore a 2048 bit RSA key would be listed
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| as having a size of 256 bytes. RSA This parameter is defined for RSA key sizes of 2048, 4096, and 8192 bits.
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| This is the email address of the recipient to whom the message is encoded.
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| This is the SecExMail session key material, encrypted with the RSA public key of the recipient.
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| The SecExMail session key is used to encrypt the message body of the email message and is comprised
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A typical SecExMail message is depicted below :
| WzI1NjpjaHJpc0BvZmZzaG9yZW1haWxyb29tLmNvbV0dJyyJnwwCm0659zpBY/asERA3FRG99
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| OYRhm5f+rwohYORt8Wp3rmwI2Nguhk38KvH5pg8ZRTXXWiEHYMakQPPXpJepJFZeXTcNMTi/d
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| p0Rc5HCTui5okW/00Gv8Sp328Ldh3DlgQcGW7oYt9qxG/cJ/PaVxxDM3I4cnsCyLjfX+I0JY6
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| h+emWt4U/N6u+K0tPL4ua2OfGhGoBXo+6KK042bXGpk/Pj6WEOQMc+VrsOx6ZcTgpqS3WCcUc
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| 2/JDy9zHqlkPLohXcT4G2Hiwp/1JhviaQtoKA2NYYimuY5ZjNUGPMs0h6AKS3/qZsHhK1LtcA
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| WpLnuoFbQleekuJngBCC1RIlIlI4lfFgMkxoUkZrtXg6E217Q6GMMhNJ4EU3D2c1BgauDYAQG
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| Rpz0p8efm/WAZoXai6KVElMEiK7tv98s8wu9LpUxN44QYj2eNRVI+GPfkBoKvr6eK5/TU4cHN
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| Dg9VxCGj4n8KDvfYsPRpBSNzLL+Ta4iz7toQ/MGdPCQa
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