CS469/569 - Linux and Unix Administration and Networking Spring 2022

Displaying ./code/04-19/README

h9
- Will be graded before next time, it will take some time for
  me to troubleshoot what problems people are having.
- Things you want to look at?

q10
- Over sql stuff in lesson 14, and h9
- Due tomorrow by midnight

Attendance

h10
- Will be released before next time, will start looking at today.
- Draft is in ../h10/ and will notify when it's ready.

The rest of lesson 15...
* Block ciphers
* DES picture - https://en.wikipedia.org/wiki/Data_Encryption_Standard
* AES picture - https://en.wikipedia.org/wiki/Advanced_Encryption_Standard
  Both DES and AES are doing "random" XORing of bits together...
  data is 11110000, password is 01011010
          password first bit 0 means first and third bit of data get XORed
	  password second bit 1 means second and third bit of data get XORed
	  ...
	  10111001 comes out, and get back to 11110000 with password
  Both DES and AES are symmetric key encryption - same key/password for encryption/decryption, much faster than public key encryption

Nex time...
* Test server/client
* SSL/TLS handshake - picture from wikipedia, demo in wireshark next time
* PRNG - https://en.wikipedia.org/wiki/Pseudorandom_number_generator
  - Simple ones for testing / randomized algorithms
  - Strong ones for use in crypto

Remaining three lectures...
* Demo's from lessons 16-18
* Maybe another quiz
* Maybe another hw
* Exam will be cummulative, anything that was quiz'ed