is a hybrid cryptosystem that combines some of the best available cryptographic algorithms and has become the open-source de facto standard for encryption and authentication of e-mail and file storage applications.

Pretty Good Privacy (PGP) is the correct answer of this question.

Explanation:

Pretty Good Privacy (PGP) is a hybrid cryptosystem that incorporates some of the best available routing protocols and has become the defacto free software framework for email and cloud storage applications to be encrypted and authenticated.

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