The terms confusion and diffusion were introduced by Claude Shannon to capture the two basic building blocks for any cryptographic system [8]. Shannon’s concern was to thwart cryptanalysis based on statistical analysis.
Diffusion and confusion are the two cornerstones of block cipher design, these are:
•?Diffusion means that each plaintext bit must affect as many ciphertext bits as possible.
•?Confusion in this context means that the relationship between the encryption key and the
ciphertext must be as complex as possible. Another way of describing confusion would be that each bit of the key must affect as many bits as possible of the output ciphertext block
lydiajane74 answered the question on May 13, 2018 at 23:30
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In DES, the encryption and decryption algorithms are the same. Is that also the case in AES?
(Solved)
In DES, the encryption and decryption algorithms are the same. Is that also the case in AES?
Date posted:
May 13, 2018
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Answers (1)
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What do we mean by public-key cryptography?
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What do we mean by public-key cryptography?
Date posted:
May 13, 2018
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What is a certificate and why are certificates needed in public key cryptography?
(Solved)
What is a certificate and why are certificates needed in public key cryptography?
Date posted:
May 13, 2018
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Answers (1)
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To illustrate exactly when an object is constructed and destructed when returned from a function, create a C++ class called who. Have who's constructor take...
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To illustrate exactly when an object is constructed and destructed when returned from a function, create a C++ class called who. Have who's constructor take one character argument that will be used to identify an object.Have the constructor display a message similar to this when constructing an object:
Constructing who #X
where x is the identifying character associated with each object when an object is destroyed, have a message similar to this displayed:
Destroying who #x
where, again, x is the identifying character. Finally, create a function called make_who() that returns a who object. Give each object a unique name.Note the output displayed by the program.
Date posted:
May 12, 2018
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Answers (1)
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other than the incorrect freeing of dynamically allocated memory, think of a situation in which it would be improper to return an object from a...
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other than the incorrect freeing of dynamically allocated memory, think of a situation in which it would be improper to return an object from a function.
Date posted:
May 12, 2018
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Answers (1)
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As you know, when an object is passed to a function, a copy of that object is made.Further, when that function returns, the copy's destructor...
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As you know, when an object is passed to a function, a copy of that object is made.Further, when that function returns, the copy's destructor function is called.Keeping this in mind, what is wrong with the following program?
// This program contains an error.
#include
#include
using namespace std;
class dyna {
int *p;
public:
dyna(int i);
~dyna() { free(p); cout << "freeing \n"; }
int get() { return *p; }
};
dyna::dy*) malloc(sizeof(int));
if(!p) {
cout << "Allocation failure\";
exit(1);
}
*p = i;
}
// Return negative value of *ob.p
int neg(dyna ob)
{
retur.get();
}
int main()
{
dyna 0(-10);
cout << o.get() << "\n";
cout << neg(o) << "\n";
dyna o2(20);
cout << o2.get () << "\n";
cout << neg (o2)\n";
cout << o.get () << "\n";
cout << neg (o) << "\n";
return 0;
}
Date posted:
May 12, 2018
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Answers (1)
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If a queue dynamically allocates memory to hold the queue, explain the reason for that occurence and state whether in such a situation it...
(Solved)
If a queue dynamically allocates memory to hold the queue, explain the reason for that occurence and state whether in such a situation it is possible to block one queue from being assigned to another.
Date posted:
May 12, 2018
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Answers (1)
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Create a class called dice that contains one private integer variable.Create a function called roll() that uses the standard randomn number generator, rand(), to generate...
(Solved)
Create a class called dice that contains one private integer variable.Create a function called roll() that uses the standard randomn number generator, rand(), to generate a number between 1 and 6. Then have roll() display that value.
Date posted:
May 12, 2018
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Answers (1)
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Create a class called prompt in C++ language.Pass its constructor function a prompting string of your choice.Have the constructor display the string and then input...
(Solved)
Create a class called prompt in C++ language.Pass its constructor function a prompting string of your choice.Have the constructor display the string and then input an integer.Store this value in a private variable called count.When an object of type prompt is destroyed, ring the bell on the terminal as many times as the user entered.
Date posted:
May 12, 2018
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Answers (1)
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Create a C++ class called line that draws a line on the screen.Store the line length in a private integer variable called len.Have line's constructor...
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Create a C++ class called line that draws a line on the screen.Store the line length in a private integer variable called len.Have line's constructor take one parameter: the line length.Have the constructor store the length and actually draw the line .If the system does not support graphics, display the line by using *. Give the line a destructor that erases the line.
Date posted:
May 12, 2018
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Answers (1)
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Explain what an anonymous union is and how it differs from a normal union.
(Solved)
Explain what an anonymous union is and how it differs from a normal union.
Date posted:
May 12, 2018
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Answers (1)
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Use a C++ union class to swap the low- and high-order bytes of an integer (assuming 16-bit integer; if the computer uses 32-bit integers, swap...
(Solved)
Use a C++ union class to swap the low- and high-order bytes of an integer (assuming 16-bit integer; if the computer uses 32-bit integers, swap the bytes of a short int)
Date posted:
May 12, 2018
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Answers (1)
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Given the following base C++ class,
class area_cl {
public:
double height;
double width;
};
Create two derived classes called rectangle and isosceles that inherit area_cl. Have each class include a...
(Solved)
Given the following base C++ class,
class area_cl {
public:
double height;
double width;
};
Create two derived classes called rectangle and isosceles that inherit area_cl. Have each class include a function called area()
that returns the area of a rectangle or isosceles triangle, as appropriate. Use parameterized constructors to initialize height and width.
Date posted:
May 12, 2018
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Answers (1)
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Difference between Virus and Trojan
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Difference between Virus and Trojan
Date posted:
May 12, 2018
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Under network security infrastructure, what do you understand by term Vulnerability (or Weakness)?
(Solved)
Under network security infrastructure, what do you understand by term Vulnerability (or Weakness)?
Date posted:
May 12, 2018
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Answers (1)
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Define with explanations the following terms as used in IT security: (i) Confidentiality (ii) Integrity (iii) Availability (iv) Privacy (v) Identification (vi) Authentication (vii) Authorization (viii) Accountability
(Solved)
Define with explanations the following terms as used in IT security
i) Confidentiality
ii) Integrity
iii) Availability
iv) Privacy
v) Identification
vi) Authentication
vii) Authorization
viii) Accountability
Date posted:
May 12, 2018
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Answers (1)
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Why is information security policy critical in the protection of information and keeping of information systems and data from danger?
(Solved)
Why is information security policy critical in the protection of information and keeping of information systems and data from danger?
Date posted:
May 12, 2018
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Answers (1)
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There are too many situations where the ICC workflows don't produce as well as results as one would hope for and rightfully expect. What accounts...
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There are too many situations where the ICC workflows don't produce as well as results as one would hope for and rightfully expect. What accounts for these less-than-expected results?
Date posted:
May 11, 2018
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Answers (1)
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Create a class called box whose constructor function is passed three double values, each of which represents the length of one side of a box.Have...
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Create a class called box whose constructor function is passed three double values, each of which represents the length of one side of a box.Have the box class compute the volume of the box and store the result in a double variable.Include a member function called vol() that displays the volume of each box object.
Date posted:
May 5, 2018
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Answers (1)
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Create a class C++ class called t_and_d that is passed the current system time and date as a parameter to its constructor when it is...
(Solved)
Create a class C++ class called t_and_d that is passed the current system time and date as a parameter to its constructor when it is created.Have the class include a member function that displays this time and date on the screen.
Date posted:
May 5, 2018
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Answers (1)