information security question

When a file is too long to be processed directly by a digital signature algorithm, a hash of the document is computed and then signed. Which properties do you require from this hash function to prevent an attacker from forging signatures? Discuss the differences (if any) where the attacker only knows the messages signed by the victim versus where the attacker can choose the messages that the victim will sign. Discuss the differences (if any) where the attacker has control over the content of the forged message versus where the attacker has no such control. Experts disagree on the relative strength of proxy servers and packet filtering firewalls. What do you think, each sides arguments are? Search the Internet, Examine the arguments and justify your own verdict on this disagreement. Research and find two breech notification information (via web, blog, etc.) issued from actual breeches. Discuss the similarities (if any) and the differences (if any) between the two. When a file is too long to be processed directly by a digital signature algorithm, a hash of the document is computed and then signed. Which properties do you require from this hash function to prevent an attacker from forging signatures? Discuss the differences (if any) where the attacker only knows the messages signed by the victim versus where the attacker can choose the messages that the victim will sign. Discuss the differences (if any) where the attacker has control over the content of the forged message versus where the attacker has no such control. Experts disagree on the relative strength of proxy servers and packet filtering firewalls. What do you think, each sides arguments are? Search the Internet, Examine the arguments and justify your own verdict on this disagreement. Research and find two breech notification information (via web, blog, etc.) issued from actual breeches. Discuss the similarities (if any) and the differences (if any) between the two