什麼是 凱薩密碼?

免費線上凱薩密碼工具。使用凱薩位移密碼加密或解密文字。

為什麼要使用 凱薩密碼?

  • Custom shift (1-25) with slider and quick ROT buttons (ROT3, ROT5, ROT13, ROT47)
  • Brute-force mode shows all 25 shifts at once
  • Letter frequency analysis with visual bar chart
  • Preserves non-alphabetic characters and case
  • Professional-grade modular arithmetic implementation

如何使用 凱薩密碼 — 逐步教學

1

Enter your text in the input box.

2

Choose Encrypt or Decrypt mode.

3

使用滑桿調整位移值,或點選 ROT 預設按鈕。

4

Toggle "All" to brute-force all 25 shifts.

5

Use the letter frequency chart to help identify the correct shift.

凱薩密碼適合誰?

  • 學習密碼學的學生
  • CTF 玩家
  • 謎題解謎者
  • 密碼學愛好者

凱薩密碼 — 常見問題

ROT13 與凱薩密碼有何不同?

ROT13 is a Caesar cipher with shift 13. Since the alphabet has 26 letters, ROT13 is self-inverse — applying it twice returns the original text. ROT47 extends the concept to all 94 printable ASCII characters.

凱薩密碼可以被破解嗎?

Yes, easily. There are only 25 possible shifts, so brute-force reveals all of them instantly. The frequency analysis chart helps identify which shift produces the most natural letter distribution.

準備好使用 凱薩密碼 了嗎?

免費線上工具 — 在瀏覽器中運作,無需註冊。立即開始使用。

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