You work as a Network Administrator for NetTech Inc. The company wants to encrypt its e-mails. Which of the following will you use to accomplish this?

Pretty Good Privacy (PGP) is a data encryption and decryption program that provides cryptographic privacy and authentication for data communication. It is the standard technology used for signing, encrypting, and decrypting emails to ensure confidentiality and integrity. PGP uses a combination of symmetric-key and public-key cryptography to provide end-to-end encryption, meaning the message is encrypted on the sender's device and can only be decrypted by the intended recipient. This makes it the appropriate choice for securing the content of e-mails themselves.

A. PPTP (Point-to-Point Tunneling Protocol) is a VPN protocol used to create a secure tunnel for network traffic, not for encrypting individual email messages.

B. IPSec (Internet Protocol Security) is a network layer protocol suite that secures IP communications, typically for VPNs. It encrypts data packets, not application-level email content.

D. NTFS (New Technology File System) is a file system for Windows. While it supports encryption for files at rest (EFS), it does not encrypt emails in transit.

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1. Garfinkel

S. (1995). PGP: Pretty Good Privacy. O'Reilly & Associates

Inc. (This is a foundational text on PGP

widely referenced in academic security courses). Chapter 1

"Introduction to PGP

" details its primary use for securing electronic mail.

2. Internet Engineering Task Force (IETF). (2007). RFC 4880: OpenPGP Message Format. The abstract and introduction (Section 1) explicitly state that the protocol is designed for securing data

including email

through encryption and digital signatures. Available at: https://doi.org/10.17487/RFC4880

3. Kaufman

C.

Perlman

R.

& Speciner

M. (2002). Network Security: Private Communication in a Public World (2nd ed.). Prentice Hall. Chapter 16

"PGP (Pretty Good Privacy)

" is dedicated to explaining PGP's architecture and its application in securing email communications.

4. Massachusetts Institute of Technology (MIT) OpenCourseWare. (2017). 6.857 Computer and Network Security

Lecture 15: Email Security. The lecture notes discuss PGP and S/MIME as the primary mechanisms for providing end-to-end security for email.

5. Microsoft. (2023). New Technology File System (NTFS) overview. Microsoft Learn. This official documentation describes NTFS as a file system for storing

organizing

and finding files on a hard disk

distinguishing its function from email transport security.