Cryptonit is a client side cryptographic tool which allows you to encrypt/decrypt and sign/verify files with pki (public key infrastructure) certificates.

it comes with:
o encryption / decryption based on ciphers provided by openssl
o rsa cryptography
o documents signature / verification
o generation of self-decrypting files (use a password to encrypt your
files either for gnu/linux or microsoft windows)
o ldap interface to import certificates (x.509)
o pkcs#11 support
o crl download
o addressbook
cryptonit provides a graphical user interface written in c++ with wxwidgets.