### balls

23 solved
Feb. 7, 2019, 1:38 a.m.

There must be a problem here. Even with the PT = hello, world., key being (2,5), and IV = e, I do not get the ciphertext displayed. Trying just the numberic table representation ('h' = 7) and ('e' = 4), or the ascii character's hexidecimal value, and then either encrypting before or after, I simply do not get the same ciphertext result.

### balls

23 solved
Feb. 11, 2019, 5:12 a.m.

Okay, I figured it out. To save the rest of you hours upon hours of confusion: Despite the DIRECT link that says XOR is used in CBC, the solution DOES NOT use XOR. As a hint, it is some other arithmetic between the previous and current ciphertext for decryption, with the Affine cipher still being used as stated.