There are side channel attacks on RSA that can eveal the key based on the Square and Multiply algorithm. Suppose an adversary has control of a smart card and can analyze its power usage. During operation of the card the adversary observes power usage that suggests that the Square and Multiply algorithm performed the operations: SQ, SQ, SQ, SQ, MUL, SQ, MUL, SQ, MUL, SQ, MUL, SQ, SQ, SQ, MUL, SQ, MUL What is the private exponent d in decimal?
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A: Here, SQ stands for "square" and MUL stands for "multiply". To determine the private exponent 𝑑d,…
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- Is it feasible to produce secret keys for use in cryptographic protocols on a desktop computer using software in such a safe way that they can be utilized, and is this something that is even achievable?Digital Signature using the RSA algorithm: Alice is sending an integer value mA = 3 to Bob with RSA signing. Alice's public key and private key are (5, 14) and (11, 14). Alice first releases her public key to public. Charlie, an attacker, sends a message mC = 4 to Bob and lets Bob believe mC is from Alice. mC’s digital signature sig(mC) is calculated using Charlie’s private key (7, 15). Show how Charlie computes sig(mC), and how Bob verifies whether it is from Alice or not (hint: Bob will use Alice’s public key).Suppose that Alice and Bob agree to hash an integer by taking the sum of the digits modulo 1212. Also suppose Alice has a public key with modulus 304891304891 and exponent 7373 and Bob has a private key given by the primes 619619 and 799799 with exponent 2323. Give the ciphertext Bob would send to sign the message 6005460054.
- Computer Science Explain how the adversary can modify a ciphertext generated using a block cipher (e.g., AES) in CBC mode in such a way that the change in the cor-responding message is small and easily predictable for the adversary. (The adversary has no access to the decryption key.)Cryptography problem mathematics Suppose Alice and Bob are using a cryptosystem with a 128-bit key, so there are 2128possible keys. Eve is trying a brute-force attack on the system.(a) Suppose it takes 1 day for Eve to try 264 possible keys. At this rate, how long willit take for Eve to try all 2128 keys? (b) Suppose Alice waits 10 years and then buys a computer that is 100 times fasterthan the one she now owns. Will she finish trying all 2128 keys before or after whatshe does in part (a)?Digital signatures have a potential weakness due to lazy users. In e-commerce transactions, a contract might be drawn up and the user asked to sign its SHA-1 hash. If the user does not actually verify that the contract and hash correspond, the user may inadvertently sign a different contract. Suppose that the Mafia try to exploit this weakness to make some money. They set up a pay Web site (e.g., pornography, gambling, etc.) and ask new customers for a credit card number. Then they send over a contract saying that the customer wishes to use their service and pay by credit card and ask the customer to sign it, knowing that most of them will just sign without verifying that the contract and hash agree. Show how the Mafia can buy diamonds from a legitimate Internet jeweler and charge them to unsuspecting customers.
- Consider the case of Alice sending a message, m, to Bob. Both Alice and Bob use public key cryptography and each has a public and private key as described in the text. The figure attached below shows the operations that Alice must perform to provide confidentiality, authentication, and integrity when sending a message to Bob over the network. We can use either symmetric key or public key cryptography to encrypt a message. For our purposes, either technique will encrypt the message, and applying both doesn't make it "more secure". Also, we can assume that the session key would remain a secret so the fact that it is discarded does not make it "more secure". Why do we use a session key, Ks, instead of relying only on public key Cryptography? In other words, why do we use both public key and symmetric key cryptography?Consider the following scenario: The ABC Bank has many ATM branches all over the country. The customers of the bank use these machines mainly for withdrawing money. Further they can transfer money from one account to another using these machines. Also they can deposit any amount of money into their accounts. The customers can contact a banking assistant through the system if any error occurred during a transaction. The ATM can be filled only by cashier. The system should authenticate the users before they are allowed to use it for the transactions mentioned above. Draw use case diagram for the above scenario Can I have a step-by-step explanation on drawing the use case diagram with the completed use case diagram? Thank you!Entrapment applies to honeypots, since they induce the attacker to break into the system Group of answer choices True False
- This may be used to explain why certain block cypher modes of operation utilise encryption alone, whereas others use encryption and decryption together:Alice and Bob use the following challenge –response authentication scheme based on digital signature. To avoid chosen text attack, they decide that Alice will sign R= RA XOR RB, where RA is chosen by Alice and RB is chosen by Bob. They work out following protocol: Alice >Bob : Alice, RA Bob >Alice : RB Alice >Bob : S (KRA, {R}) KRA is the private key of Alice. Bob verifies Alice’s signature on R to authenticate Alice. An adversary wants Alice to sign on text RT chosen by him. How does he exploit the protocol for achieving this goal? please the explain the answer in shortThe hacker group Desdeia tries to break our old weak cipher which we used for the communication with the Duchess of Ligovia. It's generally known that an actual breaking of the cipher needs the reviewing a huge amount of variants which probably lasts a couple of months. Additionally we know that the reviewing of different variants needs always the same server resource. Using our intelligence sources we tried to get some information about the actual progress of breaking, but we got only some fragments: • The hacker group Desdeia uses for breaking their powerful four-core server which resources are fully dedicated to breaking process. . The actual breaking process began exactly at noon, but we don't know, on which day. . By the noon of 2nd of April, already 648,467,673 variants were successfully reviewed. Exactly at this noon, when the breaking process was already lasted for 19 days, it was attempted to double the server speed. The doubling itself was failed, but instead of it there was…