stage

problems/p3/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "p3"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]
+common = { path = "../../common/" }
+hex = "0.4.3"

problems/p3/src/main.rs

@@ -0,0 +1,18 @@
+use common::is_valid_english;
+
+fn main() {
+    let xored_cipher = "1b37373331363f78151b7f2b783431333d78397828372d363c78373e783a393b3736";
+    let cipher_bytes = hex::decode(xored_cipher).expect("decode error");
+    for key in 0..(1 << 8) {
+        let key = key as u8;
+        // 对密文的每个字节应用异或操作，得到明文
+        let plaintext: Vec<u8> = cipher_bytes.iter().map(|&byte| byte ^ key).collect();
+        // 尝试将字节转换为字符串
+        if let Ok(text) = std::str::from_utf8(&plaintext) {
+            // 只有当转换成功时才调用is_valid_english
+            if is_valid_english(text, None) {
+                println!("Found valid sentence with key {}: {}", key, text);
+            }
+        }
+    }
+}