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This Questions on Cryptography 3 questions in the file here

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this Questions on Cryptography 3 questions in the file here is the link for the file https://drive.google.com/file/d/0B2nja6vHUILmVDFhMDdiUWNXNHM/view?usp=sharing

More Google nonsense. Could you possible paste the questions into the Messages stream? Or is everyone in such a rush to have Google pirate the entirety of their content?

1- Compare the security and performance advantages and disadvantages of each variant of CBC mode: a fixed IV, a counter IV, a random IV, and a nonce-generated IV.

2- Suppose you, as an attacker, observe the following 32-byte ciphertext C1 (in hex)

What information, if any, can you infer about the plaintext P2 corresponding to C2?

3- Let P1,P2 be a message that is two blocks long, and let P'1 be a message that is one block long. Let C0, C1, C2 be the encryption of P1, P2 using CBC mode with a random IV and a random key, and let C'0, C'1 be the encryption of P'1 using CBC mode with a random IV and the same key. Suppose an attacker knows P1, P2 and suppose the attacker intercepted and thus know C0, C1, C2 and C'0, C'1. Further suppose that, by random chance, C'1=C2. Show that the attacker can compute P'1