Suppose you have a computer and you're wanting to know if the IP address is being blocked or if SSH traffic is being blocked. What would you do to be able to determine which one is actually happening?
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Suppose you have a computer and you're wanting to know if the IP address is being blocked or if SSH traffic is being blocked. What would you do to be able to determine which one is actually happening?
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- This is case sensitive. The government hired you to decrypt the encrypted message. The hacker used a Denial of Service attack, which resulted in a massive blackout of the government websites' internet services. The only way to get things back to normal is to decode the message left by the hacker. The message has been decoded as follows: 01010011 01110100 01110101 01000100 01111001 00100000 01001000 01100001 01110010 01100100 00100000 00100110 00100000 01101101 01100001 01001011 01100101 00100000 01110011 01110101 01110010 01100101 00100000 01010100 01101111 00100000 01110000 01000001 01110011 01010011 00100000 01110100 01101000 01100101 00100000 01000101 01101101 01010000 01101111 01110111 01100101 01010010 01101101 01100101 01101110 01110100 00100000 01010100 01100101 01100011 01101000 01101110 01101111 01101100 00110000 01100111 01101001 01100101 01110011 00100000 01110011 01010101 01100010 01101010 01100101 01100011 01110100 00101110A social network company called Feta makes its profit by spreading rumours. They often want to know whether in a group of people there is somebody from whom a rumour can propagate to every member of the group (via retweets); the rumours are saucy enough that they are pretty sure everyone retweets them. They have the information who in the group follows whom, and would like to use it to determine how many (if any) people in the group can be the starting point of a rumour which everyone would eventually get. Your job is to design an algorithm which would compute this number in linear time, given who follows whom in the group.Is it possible to generate secure secret keys for use in cryptographic protocols using software on a desktop computer?
- Imagine an email, and what comes to mind? How long does it take for an email to go from one location to another, and what causes this delay? If you want to be sure you don't forget anything, write it down. Where do the two paths part ways? Do you know how much depth (or simplicity) each model has?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.Is it possible for an encrypted e-mail address to give proof to a sender that a receiver has read an e-mail message? Why do you think it is?
- 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.Cryptography is the practice of encryption. Information Security uses cryptography techniques to encrypt and decrypt data. A simple encryption method might take plaintext and mix up the letters using some predetermined pattern and then use that pattern to decrypt the data for reading. Ciphers are the algorithms used to put the data into its secret pattern and then systematically decrypt it for reading. This script is going to use a famous simple cipher called the Caesar Cipher. It is a substitution cipher where each letter in the text is 'shifted' in a certain number of places. It uses the alphabet as the primary pattern and then based on the shift number, it would shift all the letters and replace the alphabet with our pattern. For example, if our shift number was 3, then A would be replaced with D, if we performed a right shift. As an example: Text = "THE CAT IS VISIBLE AT MIDNIGHT" Ciphertext = "WKH FDW LV YLVLEOH DW PLGQLIJKW" The keys to decrypt this message are the shift number…Cryptography is the practice of encryption. Information Security uses cryptography techniques to encrypt and decrypt data. A simple encryption method might take plaintext and mix up the letters using some predetermined pattern and then use that pattern to decrypt the data for reading. Ciphers are the algorithms used to put the data into its secret pattern and then systematically decrypt it for reading. This script is going to use a famous simple cipher called the Caesar Cipher. It is a substitution cipher where each letter in the text is 'shifted' in a certain number of places. It uses the alphabet as the primary pattern and then based on the shift number, it would shift all the letters and replace the alphabet with our pattern. For example, if our shift number was 3, then A would be replaced with D, if we performed a right shift. As an example: Text = "THE CAT IS VISIBLE AT MIDNIGHT" Ciphertext = "WKH FDW LV YLVLEOH DW PLGQLIJKW" The keys to decrypt this message are the shift number…
- Suppose you have a block cipher with block length of 32 bytes (256-bits). Suppose you want to encrypt a message that is 747 bytes long. Using CBC mode and ciphertext stealing, how long will the ciphertext be? That is, how many bytes will be in the ciphertext?One of the problems with the Internet email system is that sending forged emails is relatively straightforward, i.e., it is easy to send an email with a fake sender/from address. One solution to this problem would be for a domain’s mail servers to digitally sign any email originating from the domain. For this to be useful, the public key would need to be made available to clients to validate the signatures. It is proposed that the public keys of the mail servers will be verified and signed by a certification authority (same as SSL/TLS certificates) and distributed via a standardised URL for the domain, e.g., https://mybusiness.com/email.pubkey. (a) Explain how the client would obtain the public key and validate the email server’s digital signatures. (b) Discuss the problem of trusting the obtained public key and how this solution results in public keys that can/cannot be trusted. (c) Indicate whether you believe this approach could be used to prevent forged emails and explain why it…In symmetric-key cryptography, if every person in a group of 10 people needs to communicate with every other person in another group of 10 people, how many secret keys are needed?