CompTIA Security+ Exam Prep

Answer: D - Pretty Good Privacy (PGP) was designed by Phil Zimmerman as a freeware e-mail security program and was released in 1991. It was the first widespread public key encryption program. PGP is a complete cryptosystem that uses cryptographic protection to protect e-mail and files. It can use RSA public key encryption for key management and use the IDEA symmetric cipher for bulk encryption of data, although the user has the option of picking different types of algorithms for these functions. PGP does not use a hierarchy of CAs or any type of format trust certificates, but instead relies on “web of trust” in its key management approach. Each user generates and distributes his or her public key and users sign each other’s public keys, which creates a community of users who trust each other.