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SecExMail Message Format
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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  
 
 
message_format  
 
 
·RSA Bytes  
 
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.  
 
·Recipient  
 
This is the email address of the recipient to whom the message is encoded.  
 
·Key  
 
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 random number generator key, and a 256 bit Twofish key.  
 
·Cipher Text  
 
This is the message body encrypted using SecExMail Encryption.  
 
 
A typical SecExMail message is depicted below :
 
 
--Begin SecEx 1.1--  
WzI1NjpjaHJpc0BvZmZzaG9yZW1haWxyb29tLmNvbV0dJyyJnwwCm0659zpBY/asERA3FRG99  
OYRhm5f+rwohYORt8Wp3rmwI2Nguhk38KvH5pg8ZRTXXWiEHYMakQPPXpJepJFZeXTcNMTi/d  
p0Rc5HCTui5okW/00Gv8Sp328Ldh3DlgQcGW7oYt9qxG/cJ/PaVxxDM3I4cnsCyLjfX+I0JY6  
h+emWt4U/N6u+K0tPL4ua2OfGhGoBXo+6KK042bXGpk/Pj6WEOQMc+VrsOx6ZcTgpqS3WCcUc  
2/JDy9zHqlkPLohXcT4G2Hiwp/1JhviaQtoKA2NYYimuY5ZjNUGPMs0h6AKS3/qZsHhK1LtcA  
WpLnuoFbQleekuJngBCC1RIlIlI4lfFgMkxoUkZrtXg6E217Q6GMMhNJ4EU3D2c1BgauDYAQG  
Rpz0p8efm/WAZoXai6KVElMEiK7tv98s8wu9LpUxN44QYj2eNRVI+GPfkBoKvr6eK5/TU4cHN  
Dg9VxCGj4n8KDvfYsPRpBSNzLL+Ta4iz7toQ/MGdPCQa  
--End SecEx Mail--  
 
 
 






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