Because of the known risks of the UNIX password system, the SunOS-4.0 documentation recommends that the password file be removed and replaced with a publicly readable file called /etc/publickey. An entry in the file for user A consists of a user’s identifier IDA, the user’s public key, PUa, and the corresponding private key PRa. This private key is encrypted using DES with a key derived from the user’s login pass- word Pa. When A logs in, the system decrypts E(Pa, PRa) to obtain PRa. a. The system then verifies that Pa was correctly supplied. How? b. How can an opponent attack this system?

On the loan worksheet in cell c9 enter pmt function to calculate the monthly payment for the altamonte springs 2018 facilities loan. ensure that the function returns a positive value and set the reference to cells b5 and b6 as absolute references.

What is a costume plot? why is it important to a film or theater production?

Consider the following statements: struct nametype{string first; string last; }; struct coursetype{string name; int callnum; int credits; char grade; }; struct studenttype{nametype name; double gpa; coursetype course; }; studenttype student; studenttype classlist[100]; coursetype course; nametype name; mark the following statements as valid or invalid. if a statement is invalid, explain why. a.) student. course. callnum = "csc230"; b.) cin > > student. name; c.) classlist[0] = name; d.) classlist[1].gpa = 3.45; e.) name = classlist[15].name; f.) student. name = name; g.) cout < < classlist[10] < < endl; h.) for (int j = 0; j < 100; j++)classlist[j].name = name; i.) classlist. course. credits = 3; j.) course = studenttype. course;