diff --git a/chrs-shhh/Cargo.toml b/chrs-shhh/Cargo.toml
new file mode 100644
index 00000000..e2a437d1
--- /dev/null
+++ b/chrs-shhh/Cargo.toml
@@ -0,0 +1,11 @@
+[package]
+name = "chrs-shhh"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+serde = { version = "1.0", features = ["derive"] }
+serde_json = "1.0"
+thiserror = "1.0"
+regex = "1.10"
+lazy_static = "1.4"
diff --git a/chrs-shhh/src/lib.rs b/chrs-shhh/src/lib.rs
new file mode 100644
index 00000000..aba01985
--- /dev/null
+++ b/chrs-shhh/src/lib.rs
@@ -0,0 +1,82 @@
+use regex::Regex;
+use lazy_static::lazy_static;
+
+pub struct RedactionRule {
+    pub name: String,
+    pub pattern: Regex,
+    pub replacement: String,
+}
+
+pub struct SecretSentinel {
+    rules: Vec<RedactionRule>,
+}
+
+lazy_static! {
+    static ref OPENAI_KEY: Regex = Regex::new(r"sk-[a-zA-Z0-9]{48}").unwrap();
+    static ref AWS_KEY: Regex = Regex::new(r"AKIA[0-9A-Z]{16}").unwrap();
+    static ref GENERIC_SECRET: Regex = Regex::new(r"(?i)(password|secret|key|token)\s*[:=]\s*[^\s]+").unwrap();
+}
+
+impl SecretSentinel {
+    pub fn new_default() -> Self {
+        let rules = vec![
+            RedactionRule {
+                name: "OpenAI API Key".into(),
+                pattern: OPENAI_KEY.clone(),
+                replacement: "[REDACTED OPENAI KEY]".into(),
+            },
+            RedactionRule {
+                name: "AWS Access Key".into(),
+                pattern: AWS_KEY.clone(),
+                replacement: "[REDACTED AWS KEY]".into(),
+            },
+            RedactionRule {
+                name: "Generic Secret".into(),
+                pattern: GENERIC_SECRET.clone(),
+                replacement: "$1: [REDACTED]".into(),
+            },
+        ];
+        Self { rules }
+    }
+
+    pub fn scrub_text(&self, input: &str) -> String {
+        let mut scrubbed = input.to_string();
+        for rule in &self.rules {
+            scrubbed = rule.pattern.replace_all(&scrubbed, &rule.replacement).to_string();
+        }
+        scrubbed
+    }
+
+    pub fn contains_secrets(&self, input: &str) -> bool {
+        self.rules.iter().any(|rule| rule.pattern.is_match(input))
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_scrub_openai_key() {
+        let sentinel = SecretSentinel::new_default();
+        let input = "My key is sk-1234567890abcdef1234567890abcdef1234567890abcdef";
+        let output = sentinel.scrub_text(input);
+        assert!(output.contains("[REDACTED OPENAI KEY]"));
+        assert!(!output.contains("sk-1234567890"));
+    }
+
+    #[test]
+    fn test_scrub_generic_password() {
+        let sentinel = SecretSentinel::new_default();
+        let input = "login with password: my-secret-password now";
+        let output = sentinel.scrub_text(input);
+        assert!(output.contains("password: [REDACTED]"));
+    }
+
+    #[test]
+    fn test_contains_secrets() {
+        let sentinel = SecretSentinel::new_default();
+        assert!(sentinel.contains_secrets("AKIAIOSFODNN7EXAMPLE"));
+        assert!(!sentinel.contains_secrets("nothing sensitive here"));
+    }
+}