Applied Cryptography: Basics

This lecture covers the basics of applied cryptography, including old encryption schemes, weaknesses, and the concept of one-time pad encryption. It explains the importance of cryptography for data security in transit and at rest, and introduces key vocabulary related to cryptographic primitives and confidentiality. Historical encryption methods such as Caesar's cipher and the Kamasutra cipher are discussed, leading to the concept of perfect secrecy with the One Time Pad (OTP). The lecture also highlights the downsides of OTP, emphasizing the need for a random, pre-shared key that must not be reused.