Mavzu: Ochiq kalitli shifrlash algoritmlari dasturiy modulini ishlab chiqish. Ishdan maqsad

1-Labaratoriya ishi

Mavzu: Ochiq kalitli shifrlash algoritmlari dasturiy modulini ishlab chiqish.

Ishdan maqsad: Asimmetrik shifrlash algoritmlaridan amalda foydalanish ko’nikmalariga ega bo’lish.

Amaliy qism

1-rasm.El-Gamal algoritmida shifrlash.

Ochiq habar: MUHAMMADJONOV

Kalit: ASCII qiymat+3

Shifrmatn:OWJCOOCFLQPQX

2-rasm.El-Gamal algoritmida deshifrlash

Shifrmatn:OWJCOOCFLQPQX

Kalit: ASCII qiymat+3

Ochiq habar: MUHAMMADJONOV

Ilova uchun dastur kodi

#include using namespace std; int main() { int i, x; char str[100]; cout << "Please enter a string:\t"; cin >> str; cout << "\nPlease choose following options:\n"; cout << "1 = Encrypt the string.\n"; cout << "2 = Decrypt the string.\n"; cin >> x; //using switch case statements switch(x) { //first case for encrypting a string case 1: for(i = 0; (i < 100 && str[i] != '\0'); i++) str[i] = str[i] + 2; //the key for encryption is 3 that is added to ASCII value cout << "\nEncrypted string: " << str << endl; break; //second case for decrypting a string case 2: for(i = 0; (i < 100 && str[i] != '\0'); i++) str[i] = str[i] - 2; //the key for encryption is 3 that is subtracted to ASCII value cout << "\nDecrypted string: " << str << endl; break; default: cout << "\nInvalid Input !!!\n"; } return 0; }