Created Tuesday 30 June 2020
Privacy - 3 parts
- Secrecy (todays' topic)
- Anonymity (next week)
- A belief in the first two
A sends message to B without C eavesdropping (C your way out?)
Cipher - "system"
Ciphertext - "gibberish"
Cleartext - "the message"
Encryption- better? It's not "you can't find the message" - it's "yeah, you have a copy but you STILL can't read it. So THERE!"
"The bookstore method" - "One-time pad"
...but what if you CANT meet?
Phil Zimmerman "Pretty Good Privacy" or PGP
Phil went to jail (for a very short time)
...so why was he QUICKLY freed?
It's the other thing you can do with these keys - a weird reverse:
Instead of -
Locking with PUBLIC, unlocking with PRIVATE. (secret messages)
Locked with PRIVATE, unlocked with PUBLIC. (only I could have locked it — and therefore this is authentication)
how to store passwords without storing passwords:
Remember — encryption yields "gibberish" --- UNIQUE
Like encryption, except:
- The "gibberish" is short
- You CANT decrypt it (ideally)
MuchB3tterpasswordTAC0S = $KNFWIHIH$F