The Best of (Math and Crypto) from XKCD

XKCD is a wonderful thrice-weekly webcomic of "romance, sarcasm, math, and language" written by Randall Munroe. Listed below are some of my favorite xkcd dealing with mathematics and/or cryptography. And if you have trouble understanding any of them, there's even a website ExplainXKCD devoted to explaining Randall's quirkly and oftimes obscure humor!

• #153: Cryptography
  
• #177: Alice and Bob
  
• #364: Responsible Behavior
  
• #1121: A Cool Proof-of-Identity Protocol
  
• #1553: Public key
  
• #1935: 2018
  
• #296: Middle-earth dictionary attack (And one from the Abstruse Goose Webcomic)

#263: Certainty

• #410: Math Paper
  
• #435: Purity
  
• #539: Boyfriend
  
• #599: Apocalypse
  
• #710: Collatz Conjecture
  
• #870: Thesis defense
  
• #1201: Integration by Parts
  
• #1856: Existence Proof
  
• #1856: Garbage Math
  
• #2028: Complex Numbers
  
• #2343: Mathematical Symbol Fight
  
• #982 Set Theorey
  
• #2529 Unsolved Math Problems
  
• #2545 Bayes' Theorem
  
• #2566 Decorative Constants
  

• #302: Names
  
• #1403: Thesis defense