Block Cipher  Question: Let temp_block denote a Sage variable that contains the output of the first application of function fK (f_K in the Sage example code) while encrypting with Simplified DES.  Using subroutines from the example sage Code, write sage code to recover the input block passed to Simplifed DES Decrypt.  Meaning reverse the […]

Consider a Feistel cipher composed of sixteen rounds with a block length of 128 bits and a key length of 128 bits. Suppose that, for a given k, the key scheduling algorithm determines values for the first eight round keys, k1, k2, ……. k8, and then sets k9 = k8, k10=k7, k11=k6, …. , k16=k1 Suppose […]

You are investigating a case involving an employee who is allegedly sending inappropriate photos via e-mail in attachments that have been compressed with a zip utility. As you examine the employee’s hard disk drive, you will find a file named orkty.zip, which you suspect is a graphic file. When you try to open the file […]

   Project 1: Cybersecurity for OPEN Data Initiatives Scenario: A federal agency has asked your cybersecurity consulting firm to provide it with a research report that examines the issues of usefulness and security in regards to Open Data. The report is intended for a group of executives at the agency who are currently involved in […]

To examine a cloud environment, you must have the latest knowledge on cloud encryption. Conduct online research, and write a two-page report about current vendors and services for encrypting data stored in the cloud. List the ven- dors, their products, and what type of cloud service level each tool is intended for, such as PaaS, […]