4. A padding oracle attack is an attack that exploits the padding of encrypted data in order to decrypt the message without having the key. 10 (a) Describe the basic mechanism by which a padding oracle attack works. Please be (b) What is the time complexity of a padding oracle attack on an AES-CBC encryption (c) Say the people who designed the system you are trying to use a padding oracle attack specific. scheme in big-O notation? Is this concerning? against also took 388 and know about the attack. They decide to only send a generic error message whenever something goes wrong in a request, whether that be an incorrect key, incorrect padding, or any other error. What side channel could you exploit that will allow you to continue to use their system as a padding oracle? (d) Let's say you are a cunning cryptographer and decide that you are going to build a system with a padding scheme that is secret. Will this stop the padding oracle attack or not? What principle supports or disproves this claim? 4. A padding oracle attack is an attack that exploits the padding of encrypted data in order to decrypt the message without having the key. 10 (a) Describe the basic mechanism by which a padding oracle attack works. Please be (b) What is the time complexity of a padding oracle attack on an AES-CBC encryption (c) Say the people who designed the system you are trying to use a padding oracle attack specific. scheme in big-O notation? Is this concerning? against also took 388 and know about the attack. They decide to only send a generic error message whenever something goes wrong in a request, whether that be an incorrect key, incorrect padding, or any other error. What side channel could you exploit that will allow you to continue to use their system as a padding oracle? (d) Let's say you are a cunning cryptographer and decide that you are going to build a system with a padding scheme that is secret. Will this stop the padding oracle attack or not? What principle supports or disproves this claim