GreenShield File is software for the encryption and signing of files. It is realized as an add-in for Microsoft Windows, with a user-interface that seamlessly integrates into the Windows File Explorer. User interaction is kept to a minimum, which increases convenience and thus user acceptance. Flexible group policies allow for central administration and easy pre-configuration.

GreenShield File provides both symmetric and asymmetric encryption based on the S/MIME standard. It is interoperable with other S/MIME compliant applications. An encrypted and/or signed file that is sent as an email attachment will be recognized as an encrypted and/or signed email by the S/MIME compliant email client of the recipient.

GreenShield uses X.509 certificates and supports a large variety of smart cards on which the corresponding long-term secrets, such as the secret signature or encryption keys, are stored.  Symmetric encryption is performed with a secret key derived from a randomly created password.

Revocation checks are performed via revocation lists or OCSP. Extensions for the connection to (automatic) certificate management systems are available.

GreenShield File provides a high security level, as it features encapsulated crypto functions and advanced smart card support.

The German Federal Office for Information Security (BSI) has approved GreenShield File for the processing and transmission of classified information up to classification level VS-NfD/NATO restricted/EU restricted.

GreenShield is also available as GreenShield Mail for the end-to-end encryption and signing of emails. Taken together, both products form a seamless solution for email and file security.