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Week 9 (Security (Encryption (keys (Proof of ownership, Access to data,…
Week 9
Security
What we want
Message consistency
ssh
Needed because
Package sniffing
What it does
Encryption
What is it?
Types
Symmetric
Caesar's cipher
Maps each character to a different character by a certain number
The key is the # you're shifting by
25 possible keys ( very limited)
You want a code that is mathematically impossible to solve or just ridiculously time consuming
Asymmetric
Difference is now we have 2 keys
Private key
keys
Proof of ownership
Access to data
It's a key to the encryption
Signature
Characteristics