Many block ciphers have a __________ structure which consists of a number of identical rounds of processing and in each round a substitution is performed on one half of the data being processed, followed by a permutation that interchanges the two halves. ? ?

Which of the following should a technician do last after cleaning up a virus infection?

a. Enable system restore and create restore point b. Educate the end user c. Update anti-virus software d. Schedule scans and updates

Which of the following statements is false?

a. Scanner method next reads characters until any white-space character is encountered, then returns the characters as a String. b. To call a method of an object, follow the object name with a comma, the method name and a set of parentheses containing the method’s arguments. c. A class instance creation expression begins with keyword new and creates a new object. d. A constructor is similar to a method but is called implicitly by the new operator to initialize an object’s instance variables at the time the object is created.