Week 1: 2
09-2023 NT219 –Cryptography
Outline
Introduction to cryptography courses
Why cryptology?
Syllabus;
Guide for reading textbooks and library;
Policy and course assessment;
Projects;
Labs and guides
Week 1: 3
09-2023 NT219 –Cryptography
Why cryptology?
Cryptology= Cryptography + Cryptanalysis
“Secret writing” Try to analysis the codes
to reveal secrets
Information security
Week 1: 4
09-2023 NT219 –Cryptography
Internet
mobile network
home network
enterprise
network
national or global ISP
local or
regional
ISP
datacenter
network
content
provider
network
Network devices:
End devices
Intermediate devices
Send?
Receiver?
Storage?
Communication links
fiber, copper, radio
transmission rate:
bandwidth
Network protocols
How to secure storage and
exchange data?
Motivations
Week 1: 5
09-2023 NT219 –Cryptography
Motivations
Data and software
What is data?
Any object that can be processed or executed by a computer
Three states of data
Transmission state
Storage state
Processing state
Data vs. information security
Hardware and devices
Reputation
Protect digital assets?
