Internal implementation

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1. Go to Options->S/MIME
2. Check Internal Implementation



Always encrypt to sender's certificate

Checked, The Bat! will encrypt every message for senders with certificates.



Cache Certificate Phrase

Choose the timespan a passphrase should be stored in memory before you have to re-enter it.



Compress data before encryption

Compression reduces message size and makes the message more resistant to attacks.

Beware: S/MIME compression is not widely adopted and may not be supported by other S/MIME-enabled e-mail client. Microsoft CryptoAPI does not support comppression!



Encryption Algorithm

Choose your preferred encryption algorithm: RC2 (128bits), 3DES (156 bits) or IDEA (128 bits).

Beware: Due to patent restrictions IDEA is not widespread, itmay not be supported by your recipient!


IDEA™ is patented in the following countries: Austria, France, Germany, Italy, Netherlands, Spain, Sweden, Switzerland, United Kingdom, United States. A license must be purchased from MediaCrypt AG for any use of IDEA™ for commercial purposes in the above countries.

MediaCrypt AG, Technoparkstrasse 1, 8005 Zurich (Switzerland); Tel.: +41-1-445 3070; Fax: +41-1-445 3071;;



Signing Hash Algorithm

Specifies which HASH algorithm is used

The default SHA-1 is widely supported and highly secure; MD-5 is your choice if your recipient's S/MIME implementation does not support SHA-1.



Random Seed File

Specifies the path where random data for key generation is stored.




Related topics:

Microsoft CryptoAPI