Suppose that alice and bob have access to two secure block ciphers, say, cipher a and cipher b, where cipher a uses a 64-bit key, whilecipher b uses a 128-bit key. alice prefers cipher a, while bob wants theadditional security provided by a 128-bit key, so he insists on cipher b. as a compromise, alice proposes that they use cipher a, but theyencrypt each message twice, using two independent 64-bit keys. assumethat no shortcut attack is available for either cipher. is alice's approachas secure as bob's?

Answerwpa2;

Hey there! hello!

there are multiple steps to this problem, so bear with my habit of explaining things to the greatest extent possible. 

the first step is to calculate the total amount that tuition will be after 8 years. this part's pretty simple, and there are multiple ways you can solve it. one way is take 32% and convert into a decimal, 0.32, then multiply it by 3,125. you could then add this number to the original tuition, since it will be an increase. otherwise, you could do some mental (or calculator) math and figure that 132% of the original tuition will be present after 8 years, and simply multiply the tuition by 1.32. either way, tuition will be 1000 more than the current tuition, or $4,125.

now, all you need to do is calculate the savings. in this case, arther's family will be saving $75 per month for 5 years, or 60 months (5*12). now, just multiply 75 times 60 to get the total amount of savings, which happens to be 4,500. this means that they will be able to pay for a two-year college when they save in this manner, with $375 left over. 

hope this you out! feel free to ask me any additional questions if you have any. : -)

1.mouse input
2.keyboard input
3.monitor output
4.speakers output
5.printer output , and input if has scanner
5.microphone input