2.1. The stream cipher described in Definition 2.1.1 can easily be generalized to work in alphabets other than the binary one. For manual encryption, an especially useful one is a stream cipher that operates on letters. 1. Develop a scheme which operates with the letters A, B,..., Z, represented by the numbers 0,1,...,25. What does the key (stream) look like? What are the encryption and decryption functions? 2. Decrypt the following cipher text: bsaspp kkuosp which was encrypted using the key: rsidpy dkawoa 3. How was the young man murdered?

In a file-oriented information system, a transaction file stores relatively permanent data about an entity is created and saved for backup and recovery purposes stores records that contain day-to-day business and operational data is a temporary file created by an information system for a single task

Assume a class window with accessor method getwidth that accepts no parameters and returns an integer. assume further an array of 3 window elements named winarr, has been declared and initialized. write a sequence of statements that prints out the width of the widest window in the array.

Part a: data processing given a data file, find the max, min, and average values of columns. also, create an addition column that is based on the other columns. there will be no error checking required for this lab. you are provided with a data file named (surprise! ) data.txt. data is arranged in columns where each item of data is twelve columns wide (so it is easy to extract data items using slicing): name height(m) weight(kg) joe 1.82 72.57 mary 1.60 63.50 dion 1.90 90.71 kayla 1.72 66.31 jose 1.78 70.23 sofia 1.63 65.12 erik 1.98 92.21 sara 1.57 65.77 your task is read the file data.txt and calculate the max, min, and average of the height and weight columns and to add an additional column that has the bmi calculated based on each height and weight. your output will look like this (and needs to be formatted like this). to match the testing on mimir here is the format string: "{: < 12s}{: < 12.2f}{: < 12.2f}{: < 12.2f}"