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- - Consider another carelessly written Web application, which uses a servlet that checks if there was an active session, but does not check if the user is authorized to access that page, instead depending on the fact that a link to the page is shown only to authorized users. What is the risk with this scheme? (There was a real instance where applicants to a college admissions site could, after logging into the Web site, exploit this loophole and view information they were not authorized to see; the unauthorized access was however detected, and those who accessed the information were punished by being denied admission.)What type of authentication method is displayed in this picture? Multi-Factor Authentication Biometric Authentication Token-based authentication Single Sign-on 2.Wendy is examining the logs of a web server that was compromised by a remote attacker. She notices that right before the attack, the logs show a series of segmentation fault errors. Other logs indicate that the attacker sent very long input strings to the web server that had malicious commands at the end of the string. What type of attack most likely took place? SQL Injection Cross-site request forgery Cross-Site scripting Buffer Overflow 3.Jessica is combatting a security incident where a specific piece of malware is continually infecting systems on her network. She would like to use application control technology to block this file. What type of application control should she use? Greylisting Bluelisting Whitelisting BlacklistingAs discussed in Exercise 18.15, snapshot isolation can be implemented usinga form of timestamp validation. However, unlike the multiversion timestamporderingscheme, which guarantees serializability, snapshot isolation does notguarantee serializability. Explain the key difference between the protocols thatresults in this difference.
- Please solve it correctly and give proper explanation. Question: Given, you want to visit “welcomebacktophysicalexams.com”. Your network has alocal DNS server and is using a recursive lookup to fetch IP addresses and RTT of 29 ms.Others in your network have already visited the above website a few hours before yourvisit.After fetching the IP address, your PC sends a non-persistent HTTP request of size 109bytes to bring 13 objects of size 31 bytes each. In this particular connection, it requiresthe PC 67ms to send the TCP request to the server. I. What is the total RTT in ms in the DNS lookup?II. What is the total RTT in ms required (including DNS) to bring the full object toyour PC?III. What is the total file transmission time in ms after fetching the IP address?2. Recall the concept of Physically Unclonable Functions, which are an importantcomponent of hardware based security. Here is a simple scenario and simple protocol usingPUFs for authenticating a tag. In the protocol below, the Reader stores ALL possiblecombinations of Challenge-Response pairs for every tag it needs to authenticate. Duringauthentication, the Reader broadcasts the ID of the tag, and a greeting (Gn ). Every tag maysee this message, but only the one with the right ID will process the message. The right tagwith the ID in the message will then feed the greeting to its PUF and compute the responseSn. The response is then sent to the Reader. This should be clear from the Figure below. Forthe next round of authenticating the same Tag, the process repeats with a new Greeting(G n+1 ). Since the Reader has the responses, authentication is straightforward. Recall thatChallenges and Responses are typically 128 or 256 bit strings for RFIDs.From the protocol, and class, it should be…Please solve it correctly with a proper explanation of the calculation. Question: Given, you want to visit “welcomebacktophysicalexams.com”. Your network has alocal DNS server and is using a recursive lookup to fetch IP addresses and RTT of 29 ms.Others in your network have already visited the above website a few hours before yourvisit.After fetching the IP address, your PC sends a non-persistent HTTP request of size 109bytes to bring 13 objects of size 31 bytes each. In this particular connection, it requiresthe PC 67ms to send the TCP request to the server. I. What is the total RTT in ms in the DNS lookup?II. What is the total RTT in ms required (including DNS) to bring the full object toyour PC?III. What is the total file transmission time in ms after fetching the IP address?
- Using a static route would be suitable in what sorts of situations, and when?Write the Logic of your Program in main() In your main() method, read the value of the domain passed in by the user. Then obtain the IP address for the domain. Finally, obtain the data about the domain from the Shodan API. Once you have the details of the domain, print the information about the CPEs and the hostnames to the screen. If your program encounters an error either in resolving the domain or obtaining information from the API, write a simple error message to the screen and end the program. Commit and Branch! Once you have tested your index.py script, do the following: Add and commit your files using Git Remember to add the standard Python .gitignore file! (Optional) Push all your branches to GitHub.com with the command git push origin –all test your code with these commands python index.py -d purdue.edu python index.py -d blah here is the instuction The first command should bring back information about the CPEs on the Purdue website and the (long) list of hostnames…Write the Logic of your Program in main() In your main() method, read the value of the domain passed in by the user. Then obtain the IP address for the domain. Finally, obtain the data about the domain from the Shodan API. Once you have the details of the domain, print the information about the CPEs and the hostnames to the screen. If your program encounters an error either in resolving the domain or obtaining information from the API, write a simple error message to the screen and end the program. Commit and Branch! Once you have tested your index.py script, do the following: Add and commit your files using Git Remember to add the standard Python .gitignore file! (Optional) Push all your branches to GitHub.com with the command git push origin –all test your code with these commands python index.py -d purdue.edu python index.py -d blah here is the instuction The first command should bring back information about the CPEs on the Purdue website and the (long) list of hostnames…
- Exercise 8. In the peap-based sniffer program shown in Listing 15.3 (Sec- tion 15.2.3), we replace Line 1 with the following line. After that, when we run the sniffing program, we can only capture the packets in or out of our own computer, but we are not able to capture the packets among other computers that are on the same network. What is the cause of this problem? handle - pcap_open_live("eth3", BUFSIZ, 0, 1000, errbuf);Write the python code in the space provided to create a UDP server, that reads a message and sends a responseOne 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…