Chilkat AES & RSA Encryption Component 

Chilkat Crypt is an advanced ActiveX encryption component that offers both RSA public-key encryption with digital signatures as well as symmetric encryption algorithms including AES (Rijndael), Blowfish, and Twofish.
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Chilkat WebMail ASP Email Component 

A powerful POP3 / SMTP email client specifically designed to be used in ASP Web applications. Send mail (SMTP) , read mail (POP3), attachments, HTML, S/MIME, XML import / export, charset conversion, distribution lists, mail-merge, filtering, more...
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Chilkat S/MIME Encryption ActiveX Component 

S/MIME ActiveX component providing the ability to S/MIME encrypt or digitally sign files or data. Also decrypt and validate / authenticate S/MIME messages, data, or files. Also provides general MIME message building and decomposition capability.
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SignetSure 

SignetSure is Win32 security tool for protecting files from hacker alteration. Create digital signatures for your files from Win32 app. Then authenticate your files with single API call. Uses RSA public key cryptography. C/C++ or Visual Basic.
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