One of the earlier applications of cryptographic hash functions was the storageof passwords for user authentication in computer systems. with this method, apassword is hashed after its input and is compared to the stored (hashed) referencepassword. people realized early that it is sufficient to only store the hashed versionsof the passwords.1. assume you are a hacker and you got access to the hashed password list. ofcourse, you would like to recover the passwords from the list in order to impersonatesome of the users. discuss which of the three attacks below allow this. exactly describe the consequences of each of the attacks: attack a: you can break the one-way property of h. attack b: you can find second preimages for h. attack c: you can find collisions for h.2. why is this technique of storing hashed passwords often extended by the useof a so-called salt? (a salt is a random value appended to the password beforehashing. together with the hash, the value of the salt is stored in the list of hashedpasswords.) are the attacks above affected by this technique? 3. is a hash function with an output length of 80 bit sufficient for this application?

Formatting rows and columns is similar to cell formatting. in an openoffice calc spreadsheet, you can format data entered into rows and columns with the of the rows and columns options. you can insert rows and columns into, or delete rows and columns from, a spreadsheet. use the insert or delete rows and columns option on the insert tab. alternatively, select the row or column where you want new rows or columns to appear, right-click, and select insert only row or only column options. you can hide or show rows and columns in a spreadsheet. use the hide or show option on the format tab. for example, to hide a row, first select the row, then choose the insert tab, then select the row option, and then select hide. alternatively, you can select the row or columns, right-click, and select the hide or show option. you can adjust the height of rows and width of columns. select row and then select the height option on the format tab. similarly, select column, then select the width option on the format tab. alternatively, you can hold the mouse on the row and column divider, and drag the double arrow to the position. you can also use the autofit option on the table tab to resize rows and columns.

Scanning the road can be thought of as a

This assignment continues work on the online booking facility introduced at the end of chapter- 10. the work will be continued in the assignments for chapters 14 and 15 (a) assume that you will produce your online booking facility using an agile approach. i. suggest the kind of user research you would like to conduct for your product before iteration cycles begin. ii prioritize the requirements for your product according to business value, i. e which requirements are likely to provide the greatest business benefit, and sketch out the ux design work you would expect to undertake during the first four iteration cycles, i. e. cycle 0, and cycles 1 to 3. (b) using one of the mockup tools introduced above, generate a mockup of your product's landing page, as developed in the assignment for chapter-11 (c) using one of the patterns websites listed previously, identify suitable interaction patterns for elements of your product, and develop a software-based prototype that incorporates all the feedback and the results of the user experience mapping achieved at the end of chapter-11. if you do not have experience in using any of these, create a few html web pages to represent the basic structure of your website