The following are resources that can be used to gain more knowledge of this chapter:
- What Is Data Encryption?: https://digitalguardian.com/blog/what-data-encryption
- Encryption: https://searchsecurity.techtarget.com/definition/encryption
- History of Encryption: https://www.sans.org/reading-room/whitepapers/vpns/history-encryption-73
- Digital signatures: https://www.tutorialspoint.com/cryptography/cryptography_digital_signatures.htm