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This SMIME Messenger can generate and read S/MIME messages.
There are some limitation for use because of this implementation,
but it can operate "Signing", "Encryption", and "Signing + Encryption"
with email messages, and "Decryption" and "Signing verification"
is available for S/MIME messages.
Limitation is following :
* only "RC2 40bit" symmentric cipher is used for encryption and
decryption.
* AiCrypto S/MIME can not operate any MultiPart analysis. Therefore,
the Clear Signature message type is not available to use.
* Signature and message will be embeded in smime.p7s file.
* Verification process requires the certificates, which shuold be
embeded in the S/MIME message.
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