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3 years ago

What is the main storage device where the computer stores data?

1 answer:

8 0

D. RAM
<span>Primary storage typically refers to random access memory (RAM), while secondary storage refers to the computer's internal hard drive. RAM, commonly called "memory," is considered primary storage, since it stores data that is directly accessible by the computer's CPU.</span>

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HELP PLX ITS PYTHON BTW!!!

ExtremeBDS [4]

Answer:

Sebastian is your last name diaz

Explanation:

Functions allow us to break our program into multiple parts

Multiple is the answer

Atlanta-Robinson

5 0

3 years ago

From the standpoint of the governing bodies of .com, why is it important that owners of individual domains maintain authoritativ

mixer [17]

Answer:

Explanation:

A subdomain is really important on the internet, we can categorize our blog, e-commerce or simple informative website, for example, if we want to have a blog and e.commerce of the same topic, we can have a subdomain for each website, if we separate our website, and we administrate our content is a good signal for SEO, we could have more promotion in search engine.

4 0

4 years ago

What sequence would a user need to follow to change Chart A into Chart B?

alexandr402 [8]

Either options C or D

You can change the chart type of the whole chart or for single data series in most 2-D charts to give the chart a different look. In 3D or bubble charts, you can only change the chart type of the whole chart. By following the steps in the answers above, you will be in a position to select available chart type like column chart or line chart.

3 0

3 years ago

An initialization expression may be omitted from the for loop if no initialization is required.

stealth61 [152]

Answer:

True

Explanation:

for loop is used to repeat the process again and again until the condition not failed.

syntax:

for(initialize; condition; increment/decrement)

{

Statement

}

But we can omit the initialize or condition or increment/decrement as well

the syntax after omit the initialization,

for( ; condition; increment/decrement)

{

Statement

}

The above for loop is valid, it has no error.

Note: don't remove the semicolon.

You can omit the condition and increment/decrement.

and place the semicolon as it is. If you remove the semicolon, then the compiler show syntax error.

5 0

4 years ago

Implement the RC4 stream cipher in C++. User should be able to enter any key that is 5 bytes to 32 bytes long. Be sure to discar

gladu [14]

Answer:

Explanation:

#include <iostream>

#include <string>

#include<vector>

using namespace std;

vector<int> permute(vector<int>, vector<int>);

string encrypt(vector<int>s1 , vector<int> t1, string p);

string decrypt(vector<int>s1, vector<int> t1, string p);

int main() {

string plaintext = "cryptology";

string plaintext2 = "RC4";

vector<int> S(256);

vector<int> T(256);

int key[] = { 1,2,3,6 };

int key2[] = { 5,7,8,9 };

int tmp = 0;

for (int i = 0; i < 256;i++) {

S[i] = i;

T[i] = key[( i % (sizeof(key)/sizeof(*key)) )];

}

S = permute(S, T);

for (int i = 0; i < 256 ;i++) {

cout << S[i] << " ";

if ((i + 1) % 16 == 0)

cout << endl;

}

cout << endl;

string p = encrypt(S, T, plaintext);

cout << "Message: " << plaintext << endl;

cout << "Encrypted Message: " << " " << p << endl;

cout << "Decrypted Message: " << decrypt(S, T, p) << endl << endl;

tmp = 0;

for (int i = 0; i < 256;i++) {

S[i] = i;

T[i] = key2[(i % (sizeof(key) / sizeof(*key)))];

}

S = permute(S, T);

for (int i = 0; i < 256;i++) {

cout << S[i] << " ";

if ((i + 1) % 16 == 0)

cout << endl;

}

cout << endl;

p = encrypt(S, T, plaintext2);

cout << "Message: " << plaintext2 << endl;

cout << "Encrypted Msg: " << p << endl;

cout << "Decrypted Msg: "<<decrypt(S, T, p) << endl << endl;

return 0;

}

string decrypt(vector<int>s1, vector<int> t1, string p) {

int i = 0;

int j = 0;

int tmp = 0;

int k = 0;

int b;

int c;

int * plain = new int[p.length()];

string plainT;

for (int r = 0; r < p.length(); r++) {

i = (i + 1) % 256;

j = (j + s1[i]) % 256;

b = s1[i];

s1[i] = s1[j];

s1[j] = b;

tmp = (s1[i] + s1[j]) % 256;

k = s1[tmp];

c = ((int)p[r] ^ k);

plain[r] = c;

plainT += (char)plain[r];

}

return plainT;

}

string encrypt(vector<int>s1, vector<int> t1, string p) {

int i = 0;

int j = 0;

int tmp = 0;

int k = 0;

int b;

int c;

int * cipher = new int [p.length()];

string cipherT;

cout << "Keys Generated for plaintext: ";

for (int r = 0; r < p.length(); r++) {

i = (i + 1) % 256;

j = (j + s1[i]) % 256;

b = s1[i];

s1[i] = s1[j];

s1[j] = b;

tmp = (s1[i] + s1[j]) % 256;

k = s1[tmp];

cout << k << " ";

c = ((int)p[r] ^ k);

cipher[r] = c;

cipherT += (char)cipher[r];

}

cout << endl;

return cipherT;

}

vector<int> permute(vector<int> s1, vector<int> t1) {

int j = 0;

int tmp;

for (int i = 0; i< 256; i++) {

j = (j + s1[i] + t1[i]) % 256;

tmp = s1[i];

s1[i] = s1[j];

s1[j] = tmp;

}

return s1;

}

6 0

3 years ago