Encryption and Public Keys

• Define encryption

• Define decryption

• How does a Caesar Cipher work?

  • Given a message and key, be able to encrypt and decrypt a method

  • What are the problems with a Caesar Cipher?

• How would using a 10 digit key change the security of a Caeser Cipher?

• How does increasing a key's length impact the difficulty of cracking a cipher?

• What is symmetric encryption?

  • What's the problem with this system?

• Describe how public key encryption works in broad terms 

Public Key Cryptography

• What term is used to describe a public and private pair of keys?

• Who can use see public key?

• Who can see your private key?

• What is the point of encrypting something with my private key?

Computerphile - How To Choose A Good Password

• What two things do you need to look at for every password?

  • What two kinds of attacks does it need to protect against?

• Why does Mike think passwords are a bad authentication system?

• What's wrong with using Tr0ub4dor as a password?

• What's the XKCD argument for "correcthorsebatterystaple"

• What is his advice to someone using this style of password system?

• How does a password manager work?

• Is it safe to reuse passwords?  Why or why not?