Week 5: 1
10-2023 NT219–Cryptography
NT219- Cryptography
PhD. Ngoc-Tu Nguyen
tunn@uit.edu.vn
Week 5: Modern Symmetric Ciphers (P3)
Week 5: 2
10-2023 NT219–Cryptography
Outline
Stream Cipher
Block cipher
Data Encryption Standard (DES)
Advanced Encryption Standard (AES)
Mode of operation
Some other ciphers
• Searchable encryption
Week 5: 3
10-2023 NT219–Cryptography
Textbooks and References
Text books
[1] Chapter 4,6 [2] Chapter 5
Week 5: 4
10-2023 NT219–Cryptography
DES review
64 bits
Week 5: 5
10-2023 NT219–Cryptography
DES review
Substitution
Permutation
F(Ri–1, Ki) = P(S(EP(Ri–1) ⊕ Ki)), i = 1,…,16