Your password-protected wireless network is often penetrated by a neighbor, despite the fact that you did not offer the password to this neighbor. Is there a particular problem in this method that went unnoticed?
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- Https is a protocol used to secure websites from being tampered with by other parties without proper authorization. it bridges the gap between sender and receiver.Using protocols like secure socket layer/TLS, HTTPS encrypts data sent over the internet, making it unreadable to anybody who shouldn't have it.This prevents a "man in the middle" assault on the system.Such assaults intercept messages before they reach their intended recipient.It then transmits the revised information to the user.It guarantees the server's authenticity, too.Give an example of a method for detecting each other on a network: (a) Network sniffing is a kind of network reconnaissance. (a) Wiretapping is a kind of surveillance.Encrypt the messageWATCH YOUR STEPby translating the letters into numbers, applying the encryption function f(p) = (−7p+2), and then translatingthe numbers back into letters
- An underground resistance group wants to write articles with completely differ- ent security goals. The resistance group shared a secret at the last resistance meeting that they can all use for these articles. Here are their goals: Only users with the shared secret should be able to upload to the server. Only users with the shared secret should be able to read the articles. Any changes to the article should still be easily detectable The resistance is paranoid about both quantum computers and any mod- ern encryption algorithms so they want to avoid public key cryptography. They only trust AES (symmetric key encryption) and SHA-256 (crypto- graphic hashing) since these have been around for decades and are resistant to quantum computers. Write a protocol for the underground paper to authenticate authors before publishing to the server. (HINT: Make sure that this protocol cannot be tricked by someone who has been listening to the previous article upload) Write a protocol for the server…Alice sends a message to Bob. The message is encrypted for confidentiality. Charlie "hacks" a router in the path between Alice's and Bob's computers. Charlie can see the message Alice sent, but cannot "break" the encryption. Briefly explain how Charlie can attempt a replay attack in this scenario.Suppose the public parameters for an instance of the RSA cryptosystem are N = 6767 and e = 7. Encrypt the messagez = 6105. Encrypt the message z = 5329.
- Alice sets up an RSA public/private key, but instead of using two primes, she chooses three primes p, q, and r and she uses n=pqr as her RSA-style modulus. She chooses an encryption exponent e and calculates a decryption exponent d. Encryption and Decryption are defined: C ≡ me mod n and m ≡ Cd mod n where C is the ciphertext corresponding to the message m. Decryption: de ≡ 1 mod φ(n) | Let p = 5, q = 7, r = 3, e = 11, and the decryption exponent d = -13. n = 105 & φ(n) = 48 Q: Alice upgrades to three primes that are each 200 digits long. How many digits does n have?Over a network using WEP, we were able to capture two frames with the sameInitialization Vector (IV). The following are the encrypted messages:• First frame encrypted message:1 0 0 1 0 0 1 0 1 0 1 1 0 0 0 0 0 1 1 1 0 1 0 1 1 0 0 1 0 1 1 1 1 0 1 1 0 1 1 0 1 0 0 11 1 1 1 1 0 0 1 0 0 0 1 0 0 1 1 1 0 0 0• Second frame encrypted message:1 1 0 0 0 0 0 1 1 1 1 0 0 0 0 1 0 0 1 1 0 1 1 1 1 1 0 0 1 0 1 1 1 1 1 0 0 0 1 1 1 1 0 11 0 1 0 1 1 0 0 1 1 0 0 0 1 1 0 1 1 1 0We also know that one of the messages is a control message with the following plaintext content:0 0 1 1 0 0 0 0 0 0 1 1 0 0 0 0 0 0 1 1 0 0 0 0 0 0 1 1 0 0 0 0 0 0 1 1 0 0 0 0 0 0 1 1 0 0 01 0 0 1 1 0 0 1 0 0 0 1 1 1 0 0 01. Find the plaintext of the other message.2. If the captured messages were from two different stations on a network that usesTKIP, is it possible to find the plaintext of the other message? Explain why orwhy not possible.A "poison packet attack" is when someone throws a bunch of poison at someone. There are two examples of this kind of attack that you can give.
- For the Zhou-Gollman non-repudiation protocol discussed in the lecture on “Non-Repudiationand Anonymity Protocols”, which one of the following statements is false:The 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…The Kerberos Authentication Server might reject an AS_REQ message and instead require pre-authentication - that is, it requires the client to send a timestamp encrypted with the client key. Why does it do this? Select one: a. It must not disclose the Ticket Granting Ticket before the client has authenticated b. It is dangerous to respond to an AS_REQ message before the client has authenticated c. Responding to multiple AS_REQ messages would allow a guessed plaintext attack d. It needs the client's public key to check the pre-authentication message was signed correctly