Sam, a web developer, was instructed to incorporate a hybrid encryption software program into a web application to secure email messages. Sam used an encryption software, which is a free implementation of the OpenPGP standard that uses both symmetric-key cryptography and asymmetric-key cryptography for improved speed and secure key exchange. What is the encryption software employed by Sam for securing the email messages?

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D. GPG GPG (GNU Privacy Guard) is a free software implementation of the OpenPGP standard (RFC 4880) that uses asymmetric-key cryptography for secure key exchange and symmetric-key cryptography for bulk message encryption, providing both speed and security. Unlike commercial PGP, GPG is fully open-source and freely available, which matches the 'free implementation' qualifier in the question. This hybrid approach is exactly what GPG uses to secure email messages.

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A. PGP PGP (Pretty Good Privacy) is the original commercial product developed by Phil Zimmermann; GPG is the free open-source implementation of the same OpenPGP standard.

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B. S/MIME S/MIME (Secure/Multipurpose Internet Mail Extensions) uses X.509 certificate-based encryption and is not a free implementation of the OpenPGP standard.

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C. SMTP SMTP (Simple Mail Transfer Protocol) is an email transmission protocol, not an encryption software program.

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