2 2 Sum of squared integers.? Let T(n) = 1 + 2 + ....n 2 w? here ? is a positive integer. It can be shown ? t?hat???? )=? ? ?+ 1)(2?n + l)/6. a. Make a t ? ? le of? (? ?n)for ?n = 1, 2, …, 10. b. How would you describe the domain of this function? c. What is the l?east value of? ?n? for which? (? ) > 1000?

Leslie Ogu CSCI 4531 09/06/2016 Chapter 2: Encryption Symmetric Encryption + The universal technique for providing confidentiality for transmitted or stored data + Also referred to as conventional encryption or singlekey encryption + Two requirements to use: + Need a strong encryption algorithm + Sender and receiver must have obtained copies of the secret key in a secure fashion and and must keep the key secure + Only alternative before publickey encryption in 1970’s + Still most widely used alternative + 5 Ingredients + Plaintext + Encryption algorithm + Secret key + Ciphertext