FIT1047 Lecture Notes - Lecture 6: Public-Key Cryptography
31 May 2018
School
Department
Course
Professor
Week 6
Sunday, 15 April 2018
1:52 pm
Cryptography
Encryption: protect community from eavesdroppers.
Integrity: protects communication from changes
Symmetric Cryptography
Uses the same key (code) to scramble up the message and unscramble it.
Can be done multiple times to enhance security.
AES does it 14 times.
To protect integrity:
Blocking chaining - take a message and split it up into blocks. For each block take the encrypted
version, XOR each block. If anything has been broken, the chain has been changed.
Disadvantage: needs a separate key for each user.
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