Week 2: 2
10-2023 NT219–Cryptography
Outline
What is cryptograph?
Algorithms
Terminologies
Application areas
Some classical cipher systems
Algorithms
•Substitution ciphers
•Transposition ciphers
Cryptanalysis (CTF + tools) ---> assignment
Week 2: 3
10-2023 NT219–Cryptography
Textbooks and References
Text books
[1] Chapter 1,3 [2] Chapter 1, 4
Week 2: 4
10-2023 NT219–Cryptography
Motivations
Data
Transmission state
Process state
•Storage state
Data Protection
Internet
mobile network
home network
enterprise
network
national or global ISP
local or
regional
ISP
datacenter
network
content
provider
network
Network or host?
Week 2: 5
10-2023 NT219–Cryptography
Motivations
Defence in depth:
Host or network?
Technical solutions
•Internal threats
•External threats
•Partners adversary Example solutions
