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
This is the size of the recipient's RSA key in bytes. Therefore a 2048 bit RSA key would be listed as having a size of 256 bytes. RSA This parameter is defined for RSA key sizes of 2048, 4096, and 8192 bits.
This is the email address of the recipient to whom the message is encoded.
This is the SecExMail session key material, encrypted with the RSA public key of the recipient. The SecExMail session key is used to encrypt the message body of the email message and is comprised of a 64 bit One Time Pad key, a 64 bit ISAAC stream cipher key, and a 256 bit Twofish key.
This is the message body encrypted with the SecExMail Cipher.
A typical SecExMail enciphered message is depicted below :
--Begin SecEx 1.1-- WzI1NjpjaHJpc0BvZmZzaG9yZW1haWxyb29tLmNvbV0dJyyJnwwCm0LI0659zpBY/asERA3FRG99 OYRhm5f+rwohYORt8Wp3rmwI2Nguhk38KvH5pg8ZRTXXWiEHYMakQPPXpbnaJepJFZeXTcNMTi/d p0Rc5HCTui5okW/00Gv8Sp328Ldh3DlgQcGW7oYt9qxG/cJ/PaVxxxEfDM3I4cnsCyLjfX+I0JY6 h+emWt4U/N6u+K0tPL4ua2OfGhGoBXo+6KK042bXGpk/Pj6WEOQMcKyR+VrsOx6ZcTgpqS3WCcUc 2/JDy9zHqlkPLohXcT4G2Hiwp/1JhviaQtoKA2NYYimuY5ZjNUGPMsIaN0h6AKS3/qZsHhK1LtcA WpLnuoFbQleekuJngBCC1RIlIlI4lfFgMkxoUkZrtXg6E217Q6GMMhHMANJ4EU3D2c1BgauDYAQG Rpz0p8efm/WAZoXai6KVElMEiK7tv98s8wu9LpUxN44QYj2eNRVI+72lGPfkBoKvr6eK5/TU4cHN Dg9VxCGj4n8KDvfYsPRpBSNzLL+Ta4iz7toQ/MGdPCQa --End SecEx Mail--
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