Just copy and paste! A simple 'Modern Enigma'

The like limit is tough...😭

Just keep it in your bookmarks!

A simple tool you can just copy and paste!

Easy with Gemini! Create a tool!

Introducing a prompt to create it in one go!

Is there anything that comes to mind when you hear the word 'cipher'?
The 'Enigma' used by Germany during World War II.
I knew the word, but I didn't know what it actually was.
When I asked Gemini if it could make one, it said, 'I can.'
So, I wanted it to try making one!

Since we're at it, let's change things up and have Gemini explain the simple logic of Enigma!

1. Reproducing the 'rotor' (gears) where the circuit changes for each character

The greatest strength of Enigma was that 'even if you type the same character, it turns into a different character every time.' When you type 'aaa', the internal gears click the moment you type the first character, and the path of the electricity (the encryption rule) changes in real-time for the second and third characters.

In the program, we use the character position (i, representing which character it is) to drastically change the numerical value used for calculation every time we advance one character.

This reproduces Enigma's greatest trick: 'even if the same character 'a' is repeated, it becomes a completely different garbled character.'

2. Reproducing the 'reflector' where encryption and decryption are the same

Enigma had a brilliant part called a 'reflector' built in, which sent electrical signals back after they hit the end.

This gave it a unique property where 'if 'A' becomes 'B' under a certain setting, typing 'B' with the exact same setting will always return it to 'A',allowing it to perform 'encryption' and 'decryption' (reverting to the original) simultaneously in a single circuit.

In the program, this is reproduced using'XOR (Exclusive OR: ^)'a standard calculation in digital encryption.

It is a mathematical trick where 'if you apply a specific number to a certain number twice, it will always return to the original number.'

Note: This version supports multi-byte characters including Japanese, and it seems to have fixed the bug derived from the reflector mechanism—where the original Enigma could never convert a character into itself—by using XOR.

Encrypt and decrypt by clicking your bookmark with the text copied!

The content you have copied will switch!

🛠️ How to use (Smartphone version)

1. Bookmark any page

First, bookmark any page, such as the one you are currently viewing.

2. Open "Edit"

On the bookmark bar, long-press the bookmark you just created and select "Edit".

3. Rewrite the content

In the settings screen that appears, change the following two items and save.

• Name: (a name that is easy for you to understand)

• URL: Delete the original URL entirely and paste the code.

It's easy, just press the bookmark!

📋 Paste this!

javascript:(function(){navigator.clipboard.readText().then(function(t){if(!t)return;var res='';for(var i=0;i<t.length;i++){res+=String.fromCharCode(t.charCodeAt(i)^((i+1)*12345&65535));}var isDe=/[ぁ-ん]/.test(res);var msg=isDe?%27%F0%9F%94%93【復号（元に戻しました）】%27:%27%F0%9F%94%92【暗号化（暗号にしました）】%27;navigator.clipboard.writeText(res).then(function(){alert(%27⚙%EF%B8%8F エニグマ %27+msg+%27\n\n▼ 処理後のテキスト ▼\n%27+res);});});})();

One-shot creation prompt!

※ Although the prompt was written for me, I haven't been able to test it this time💦

# 目的
iPadのSafariやスマホでも確実に動作する、「クリップボードのテキストを読み込み、エニグマ暗号機の仕様（インデックスに応じた動的シフトと反転可逆性）を模したロジックで暗号化・復号し、クリップボードに自動書き戻しする」ブックマークレットを生成してください。

# コードの制約（超厳守）
1. 画面を汚さない（DOM操作禁止）ため、ページへの要素追加は一切行わないこと。
2. 「navigator.clipboard.readText()」を用いて、クリップボード内のテキストを直接読み込むこと。空の場合は処理を抜けること。
3. ループ処理内で、文字のインデックス（i）を用いた動的な値と、文字コード（charCodeAt）に対してビット演算のXOR（^）および「&65535」のマスクを行い、日本語や絵文字でも絶対に文字化け・クラッシュしない可逆暗号ロジックを実装すること。
4. 【重要】ポップアップによる待機時間を無くし、Safariのクリップボード書き込み制限を回避するため、0か1かのモード選択は行わずワンタップで処理を完了させること。
5. 【重要】暗号化か復号かを自動判別するため、変換後のテキストにひらがなが含まれるか（/[ぁ-ん]/.test()）を判定し、含まれれば「🔓【復号（元に戻しました）】」、含まれなければ「🔒【暗号化（暗号にしました）】」とアラートのタイトルを動的に切り替えること。
6. 変換結果を「navigator.clipboard.writeText()」でクリップボードに書き戻した直後の「.then()」の中で、上記で判定したタイトルと処理後のテキストを「alert()」で表示すること。
7. 全体を「javascript:(function(){ ... })();」で包み、改行やスペースを排除した【完全な1行のコード】として出力すること。
8. ％（パーセント記号）やコード内での直接の改行、async/awaitは使用禁止。

# 出力形式
コードブロックに1行のコードだけを出力してください。余計な解説文や挨拶は省いてください。

About this article!

Better late than never: Points to note regarding the Gemini 3-minute cooking article | Heron

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Is it set up? Trying out a note question box in someone else's garden unexpectedly! | Heron

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