The SecExMail keys are stored in conventional text files ending in "#.pubrsa" and "#.privrsa" for public keys and private keys respectively. Files are divided into an administrative segment and a data segment. The administrative segment contains information required by SecExMail for key management. Administrative Segment
The data section is comprised of a single RSA key in base 64 encoded format. New lines in the data section are denoted by a single linefeed ( ASCII character 10 ). Private RSA keys are stored in 3DES encoded, chained block cipher format and protected with a passphrase. 
SecExMail keys held in the registry are stored in a format analogous to keys stored on file - with each parameter represented as a registry value. See image below. 
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