As you know, des is insecure because of its short key length (56 bits). an improvement, proposed by rivest, is desx. desx has key length 120 bits, seen as a pair k = (k1, k2), where k1 is 56 bits and k2 is 64 bits. the encryption of a one-block message m is desx(k, m) = k2 ⊕ des(k1, (m ⊕ k2))

a. explain how decryption is done.

When creating a budget, log fixed expenses before income. after income. after savings. at the top.

Consider the following code snippet: #ifndef cashregister_h#define cashregister_hconst double max_balance = 6000000.0; class cashregister{public: cashregister(); cashregister(double new_balance); void set_balance(double new_balance); double get_balance() const; private: double balance[12]; }; double get_monthly_balance(cashregister bk, int month); #endifwhich of the following is correct? a)the header file is correct as given.b)the definition of max_balance should be removed since header files should not contain constants.c)the definition of cashregister should be removed since header files should not contain class definitions.d)the body of the get_monthly_balance function should be added to the header file.

Janice usually works on a particular workbook that contains all business related data. she decides to keep a backup of all the data in a separate workbook. she opens a new workbook to transfer the data. which option should she use to copy all the data from one workbook to another workbook?