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21: Perfect Cipher
22: Square Cipher
23: Villager B
24: Rights out
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26: Sherlock Holmes
27: Lives out
28: Lo-Tech Cipher
29: Double Blind
30: Alpha Mixed Cipher
31: KanGacha
32: Simple Auth
33: HTTPS is secure.
34: Are you human?
35: Simple Auth II
36: Are you ESPer?
37: Competitive Programming
38: Canned Can Opener
39: Unknown Plaintext Attack
40: Deep Flag Network
41: Private BBS
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Perfect Cipher
200 points
Released at: 2012/06/03
It is proved that the one-time pad is information-theoretically secure.
encrypt.zip
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