commit 654d0ed46a5f51faaa8ed491375e5c7571dbd6b5
Author: Astrid Klipfel <astridklipfel@gmail.com>
Date:   Fri May 29 21:28:16 2026 +0200

    v1

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@@ -0,0 +1,152 @@
+use std::io::{self, Write};
+use std::time::Duration;
+
+use rand::prelude::*;
+use tokio::time::sleep;
+
+static CHARSET: [&str; 221] = [
+    "!", "\"", "#", "$", "%", "&", "'", "(", ")", "*", "+", ",", "-", ".", "/", "0", "1", "2", "3",
+    "4", "5", "6", "7", "8", "9", ",", ";", "<", "=", ">", "?", "@", "A", "B", "C", "D", "E", "F",
+    "G", "H", "I", "J", "K", "L", "M", "N", "O", "P", "Q", "R", "S", "T", "U", "V", "W", "X", "Y",
+    "Z", "[", "\\", "]", "^", "_", "`", "a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l",
+    "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z", "{", "-", "}", "~", "Ç",
+    "ü", "é", "â", "ä", "à", "å", "ç", "ê", "ë", "è", "ï", "î", "ì", "Ä", "Å", "É", "æ", "Æ", "ô",
+    "ö", "ò", "û", "ù", "ÿ", "Ö", "Ü", "¢", "£", "¥", "₧", "ƒ", "á", "í", "ó", "ú", "ñ", "Ñ", "ª",
+    "º", "¿", "⌐", "¬", "½", "¼", "¡", "«", "»", "░", "▒", "▓", "│", "┤", "╡", "╢", "╖", "╕", "╣",
+    "║", "╗", "╝", "╜", "╛", "┐", "└", "┴", "┬", "├", "─", "┼", "╞", "╟", "╚", "╔", "╩", "╦", "╠",
+    "═", "╬", "╶", "╸", "╤", "╥", "╙", "╘", "╒", "╓", "╫", "╪", "┘", "┌", "█", "▄", "▌", "▐", "▀",
+    "ʱ", "ß", "γ", "π", "Σ", "σ", "µ", "τ", "Φ", "Θ", "Ω", "δ", "∞", "φ", "ε", "∩", "≡", "±", "≥",
+    "≤", "⌠", "⌠", "÷", "≈", "°", "∙", "·", "√", "ⁿ", "²", "■",
+];
+
+struct Cipher {
+    text: String,
+    line_count: usize,
+    mask: Vec<bool>,
+}
+
+impl Cipher {
+    async fn load(delay: u64) -> Self {
+        let mut text = String::new();
+        let stdin = io::stdin();
+        let mut line_count = 0;
+
+        for line in stdin.lines() {
+            if let Ok(line) = line {
+                text += &line;
+                text += "\n";
+                Self::print_line(line.as_str(), delay).await;
+                line_count += 1;
+            }
+        }
+
+        let mask = Self::get_mask(text.as_str());
+        Cipher {
+            text,
+            line_count,
+            mask,
+        }
+    }
+
+    fn get_mask(lines: &str) -> Vec<bool> {
+        let mut mask: Vec<bool> = Default::default();
+
+        for c in lines.chars() {
+            match c {
+                c if c.is_whitespace() => mask.push(true),
+                _ => mask.push(false),
+            }
+        }
+
+        mask
+    }
+
+    async fn print_line(line: &str, delay: u64) {
+        for c in line.chars() {
+            match c {
+                c if c.is_whitespace() => print!("{c}"),
+                _ => {
+                    let idx = rand::random_range(0..CHARSET.len());
+                    print!("{}", CHARSET[idx]);
+                }
+            }
+            let _ = std::io::stdout().flush();
+            if delay > 0 {
+                sleep(Duration::from_millis(delay)).await;
+            }
+        }
+        println!();
+    }
+
+    fn reset(&self) {
+        if self.line_count > 0 {
+            print!("\x1b[{}F", self.line_count);
+        }
+    }
+
+    fn display(&self, update_prob: u32) {
+        for (c, m) in self.text.chars().zip(self.mask.iter()) {
+            match m {
+                true => print!("{c}"),
+                false => {
+                    if rand::random_range(0..100)<update_prob{
+                        let idx = rand::random_range(0..CHARSET.len());
+                        print!("{}", CHARSET[idx]);
+                    }
+                    else{
+                        print!("\x1b[1C");
+                    }
+                }
+            }
+        }
+        let _ = std::io::stdout().flush();
+    }
+
+    fn random_unmask(&mut self, num: usize) -> bool {
+        let mut rng = rand::rng();
+        let mut idx: Vec<usize> = self
+            .mask
+            .iter()
+            .enumerate()
+            .filter_map(|(i, m)| if *m { None } else { Some(i) })
+            .collect();
+
+        for offset in 0..num {
+            let selected: usize = rand::random_range(offset..idx.len());
+            self.mask[idx[selected]] = true;
+            idx[selected] = idx[offset];
+
+            if offset == (idx.len()-1){
+                return true;
+            }
+        }
+
+        false
+    }
+}
+
+#[tokio::main]
+async fn main() {
+    let mut cipher = Cipher::load(10).await;
+
+    sleep(Duration::from_millis(1000)).await;
+
+    for _ in 0..20 {
+        cipher.reset();
+        cipher.display(100);
+        sleep(Duration::from_millis(50)).await;
+    }
+
+    loop {
+        cipher.reset();
+        cipher.display(20);
+        sleep(Duration::from_millis(100)).await;
+        
+        if cipher.random_unmask(10){
+            break
+        }
+    }
+    
+    cipher.reset();
+    cipher.display(100);
+}