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--- 1. Sezar shifri (7-savol) Berilgan: k = 12, n = 26 Shifrlangan matn: mjjnadfxmdsmjgygzzusmeaulkwaduzetxmdu Deshifrlash formulasi: M_i = (C_i - k) mod 26 Misol: 1. M → 12; (12 - 12) mod 26 = 0 → A 2. J → 9; (9 - 12) mod 26 = 23 → X 3. J → 9; (9 - 12) mod 26 = 23 → X 4. N → 13; (13 - 12) mod 26 = 1 → B Shu usulda barcha harflarni deshifrlang. --- 2. Affine shifri (8-savol) Berilgan: a = 5, b = 17, n = 26 Shifrlangan matn: wjdatryfdaoreluft Deshifrlash formulasi: D(y) = a⁻¹ * (y - b) mod n a⁻¹ — bu 26 bo‘yicha teskari element bo‘lib, 21 ga teng (chunki 5 * 21 ≡ 1 mod 26). Misol: 1. W → 22; D(22) = 21 * (22 - 17) mod 26 = 21 * 5 mod 26 = 1 → B 2. J → 9; D(9) = 21 * (9 - 17) mod 26 = 21 * (-8) mod 26 = 10 → K Shu usulda barcha harflarni deshifrlang. --- 3. Bir martalik bloknot shifri (9-savol) Berilgan: Kalit: bmgnkljkl... Shifrlangan matn: fugfpfouyt... Deshifrlash formulasi: M_i = (C_i - K_i) mod 26 Misol: 1. F → 5; Kalit: B → 1; (5 - 1) mod 26 = 4 → E 2. U → 20; Kalit: M → 12; (20 - 12) mod 26 = 8 → I