Algoritmlarni loyihalashtirish va tahlil qilish

Sezar usuli bo’yicha Deshifrlash natijasi

2-topshiriq
1. Masalaning berilishi. Vignere usulida shifrlash va deshifrlash
2. Dastur kodi.
import vigenerecipher

def main():

print("--------------------------------")

print("| Vigenere shifrlash algoritmi |")
print("--------------------------------\n")

vc = vigenerecipher.VigenereCipher()

kalit = "Shoxmurod"

Matn = "O'zbekiston Xalqaro Islom Akademiyasi"

print(f'Kiritilgan matn: {Matn}')

enciphered = vc.encipher(Matn, kalit)

print(f'Shifrlangan : {enciphered}')

deciphered = vc.decipher(enciphered, kalit)

print(f'Deshifrlangan: {deciphered}')

main()

3. Natija.

3-topshiriq
1. Masalaning berilishi. 2ta sinf e’lon qilish va tiplarini solishtirish
2. Masalani yechish g‘oyasi. “typeinfo” kutubxonasidan foydalanish
3. Dastur kodi.
static String encoder(char[] key)
{
String encoded = "";

// This array represents the

// 26 letters of alphabets
boolean[] arr = new boolean[26];

// This loop inserts the keyword

// at the start of the encoded string
for (int i = 0; i < key.length; i++)
{
if (key[i] >= 'A' && key[i] <= 'Z')
{
// To check whether the character is inserted
// earlier in the encoded string or not
if (arr[key[i] - 65] == false)
{
encoded += (char) key[i];
arr[key[i] - 65] = true;
}
}
else if (key[i] >= 'a' && key[i] <= 'z')
{
if (arr[key[i] - 97] == false)
{
encoded += (char) (key[i] - 32);
arr[key[i] - 97] = true;
}
}
}

// This loop inserts the remaining

// characters in the encoded string.
for (int i = 0; i < 26; i++)
{
if (arr[i] == false)
{
arr[i] = true;
encoded += (char) (i + 65);
}
}
return encoded;
}

// Function that generates encodes(cipher) the message

static String cipheredIt(String msg, String encoded)
{
String cipher = "";

// This loop ciphered the message.

// Spaces, special characters and numbers remain same.
for (int i = 0; i < msg.length(); i++)
{
if (msg.charAt(i) >= 'a' && msg.charAt(i) <= 'z')
{
int pos = msg.charAt(i) - 97;
cipher += encoded.charAt(pos);
}
else if (msg.charAt(i) >= 'A' && msg.charAt(i) <= 'Z')
{
int pos = msg.charAt(i) - 65;
cipher += encoded.charAt(pos);
}
else
{
cipher += msg.charAt(i);
}
}
return cipher;
}