1г

Помо8гите пожалуйста бедной девочке мне нужно реализовать взлом шифра фижнера

Взлом зашифрованного русскоязычного текста методом наименьших квадратов на основе идей Казиского помогите пожалуйста умоляю

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user_319669286

Ученик

1г

12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455

 <!DOCTYPE html>  
 
<html lang="ru">  
 
<head>  
 
<meta charset="UTF-8">  
 
<title>Vigenere Cipher Tool</title>  
 
<style>  
 
  body { font-family: Arial, sans-serif; margin: 20px; }  
 
  textarea { width: 100%; max-width: 600px; height: 100px; }  
 
  input[type=text] { width: 200px; }  
 
  label { display: inline-block; margin: 0.5em 0; }  
 
  #foundKeyDiv { margin-top: 0.5em; display: none; }  
 
</style>  
 
</head>  
 
<body>  
 
<h1>Шифр Виженера</h1>  
 
<label>Входной текст:<br>  
 
  <textarea id="inputText"></textarea>  
 
</label><br>  
 
<label>Ключ:<br>  
 
  <input id="keyInput" type="text">  
 
</label><br>  
 
<button id="encryptBtn">Зашифровать</button>  
 
<button id="decryptBtn">Расшифровать</button>  
 
<button id="breakBtn">Взломать</button><br>  
 
<label>Результат:<br>  
 
  <textarea id="outputText" readonly></textarea>  
 
</label>  
 
<div id="foundKeyDiv">Найденный ключ: <span id="foundKey"></span></div>

bezbashen_bravo

Ученик

1г

маму взломай свою гомик

user_319669286

Ученик

1г

12345678910

   const alphabet = "абвгдежзийклмнопрстуфхцчшщъыьэюя"; 
  function cleanText(text) { 
    text = text.toLowerCase(); 
    text = text.replace(/ё/g, "е"); 
    text = text.replace(/[^а-я]/g, ""); 
    return text; 
  } 
  function groupify(text) { 
    return text.replace(/(.{5})/g, "$1 ").trim(); 
  }

user_319669286

Ученик

1г

123456789101112131415

 function vigenereEncrypt(plain, key) { 
    let res = ""; 
    const m = plain.length, n = key.length; 
    for (let i = 0; i < m; i++) { 
      const pi = alphabet.indexOf(plain[i]); 
      const ki = alphabet.indexOf(key[i % n]); 
      if (pi === -1) { 
        res += plain[i]; 
      } else { 
        const ci = (pi + ki) % alphabet.length; 
        res += alphabet[ci]; 
      } 
    } 
    return res; 
  }

user_319669286

Ученик

1г

12345678910111213141516

 function vigenereDecrypt(cipher, key) { 
    let res = ""; 
    const m = cipher.length, n = key.length; 
    for (let i = 0; i < m; i++) { 
      const ci = alphabet.indexOf(cipher[i]); 
      const ki = alphabet.indexOf(key[i % n]); 
      if (ci === -1) { 
        res += cipher[i]; 
      } else { 
        let pi = ci - ki; 
        if (pi < 0) pi += alphabet.length; 
        res += alphabet[pi]; 
      } 
    } 
    return res; 
  }

user_319669286

Ученик

1г

1234567891011121314151617181920

 let keyLength = 0; 
    if (distances.length > 0) { 
      const factorCounts = {}; 
      for (let d of distances) { 
        for (let f = 2; f <= 32; f++) { 
          if (d % f === 0) { 
            factorCounts[f] = (factorCounts[f] || 0) + 1; 
          } 
        } 
      } 
      let maxCount = 0; 
      for (let f in factorCounts) { 
        const count = factorCounts[f]; 
        const fNum = parseInt(f); 
        if (count > maxCount || (count === maxCount && fNum > keyLength)) { 
          maxCount = count; 
          keyLength = fNum; 
        } 
      } 
    }

user_319669286

Ученик

1г

1234567891011121314151617181920212223

 if (keyLength === 0) { 
      let bestIC = 0; 
      for (let L = 1; L <= 32 && L <= N; L++) { 
        let totalIC = 0; 
        for (let offset = 0; offset < L; offset++) { 
          let count = Array(alphabet.length).fill(0); 
          let len = 0; 
          for (let i = offset; i < N; i += L) { 
            const idx = alphabet.indexOf(cipher[i]); 
            if (idx !== -1) { 
              count[idx]++; 
              len++; 
            } 
          } 
          if (len > 1) { 
            let ic = 0; 
            for (let c of count) { 
              ic += c * (c - 1); 
            } 
            ic /= (len * (len - 1)); 
            totalIC += ic; 
          } 
        }

user_319669286

Ученик

1г

12345678910111213141516

 const avgIC = totalIC / L; 
        if (avgIC > bestIC) { 
          bestIC = avgIC; 
          keyLength = L; 
        } 
      } 
    } 
    if (keyLength === 0) { 
      return { key: "", plaintext: "" }; 
    } 
    const freqs = { 
      "а":7.64,"б":2.01,"в":4.38,"г":1.72,"д":3.09,"е":8.95,"ж":1.01,"з":1.48, 
      "и":7.09,"й":1.21,"к":3.30,"л":4.96,"м":3.17,"н":6.78,"о":11.18,"п":2.47, 
      "р":4.23,"с":4.97,"т":6.09,"у":2.22,"ф":0.21,"х":0.95,"ц":0.39,"ч":1.40, 
      "ш":0.72,"щ":0.30,"ъ":0.02,"ы":2.36,"ь":1.84,"э":0.36,"ю":0.47,"я":1.96 
    };

user_319669286

Ученик

1г

123456789101112131415161718

 chi += diff * diff / (expected || 0.0001); 
        } 
        if (chi < bestChi) { 
          bestChi = chi; 
          bestShift = k; 
        } 
      } 
      foundKey += alphabet[bestShift]; 
    } 
    const plaintext = vigenereDecrypt(cipher, foundKey); 
    return { key: foundKey, plaintext: plaintext }; 
  } 
  document.getElementById("encryptBtn").addEventListener("click", function() { 
    const input = document.getElementById("inputText").value; 
    const key = document.getElementById("keyInput").value; 
    const outputArea = document.getElementById("outputText"); 
    const foundKeyDiv = document.getElementById("foundKeyDiv"); 
    foundKeyDiv.style.display = "none";

user_319669286

Ученик

1г

1234567891011121314151617181920

 if (!input || !key) { 
      alert("Введите текст и ключ."); 
      return; 
    } 
    const cleanInput = cleanText(input); 
    const cleanKey = cleanText(key); 
    if (!cleanInput || !cleanKey) { 
      alert("Введите корректные данные (только буквы)."); 
      return; 
    } 
    const cipher = vigenereEncrypt(cleanInput, cleanKey); 
    outputArea.value = groupify(cipher); 
  }); 
  document.getElementById("decryptBtn").addEventListener("click", function() { 
    const input = document.getElementById("inputText").value; 
    const key = document.getElementById("keyInput").value; 
    const outputArea = document.getElementById("outputText"); 
    const foundKeyDiv = document.getElementById("foundKeyDiv"); 
    foundKeyDiv.style.display = "none"; 
    if (!input || !key) {

lololoshka_2008_ru

Знаток

1г

Мегафн

hlo_4

Профи

1г

Бедной девочки нужны для начала мозги

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