diff --git a/src/encrypt.ts b/src/encrypt.ts
deleted file mode 100644
index fbcbfeb..0000000
--- a/src/encrypt.ts
+++ /dev/null
@@ -1,3 +0,0 @@
-export function encrypt() {
-  return "Encrypt world";
-}
diff --git a/src/index.ts b/src/index.ts
index 9c1cda0..3cf64c4 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,8 +1,5 @@
-import { encrypt } from './encrypt';
-
-const tag = '/noise';
+import { Noise } from './noise';
 
 export {
-  tag,
-  encrypt,
+  Noise,
 }
diff --git a/src/noise.ts b/src/noise.ts
new file mode 100644
index 0000000..24887a3
--- /dev/null
+++ b/src/noise.ts
@@ -0,0 +1,17 @@
+import { bytes } from "./types/basic";
+import { Connection } from "./types/libp2p";
+
+export class Noise {
+  constructor(privateKey: bytes, staticNoiseKey?: bytes, earlyData?: bytes) {
+
+  }
+
+  public tag() {
+    return '/noise';
+  }
+
+  public encrypt(InsecureConnection: Connection, remotePublicKey: bytes) {
+
+  }
+
+}
diff --git a/src/types/libp2p.ts b/src/types/libp2p.ts
new file mode 100644
index 0000000..62303fa
--- /dev/null
+++ b/src/types/libp2p.ts
@@ -0,0 +1,15 @@
+type PeerId = {
+  id: string,
+  privKey: string,
+  pubKey: string,
+};
+
+type ConnectionStat = {
+  direction: "inbound" | "outbound",
+}
+
+export interface Connection {
+  localPeer: PeerId,
+  remotePeer: PeerId,
+  stat: ConnectionStat,
+}
diff --git a/test/index.test.ts b/test/index.test.ts
index d13bbbe..6f1fc72 100644
--- a/test/index.test.ts
+++ b/test/index.test.ts
@@ -1,9 +1,10 @@
 import { expect } from "chai";
-import { tag, encrypt} from "../src";
+import { Noise } from "../src";
 
 describe("Index", () => {
-  it("should expose right tag and encrypt function", () => {
-    expect(tag).to.equal('/noise');
-    expect(typeof(encrypt)).to.equal('function');
+  it("should expose class with tag and encrypt functions", () => {
+    const noise = new Noise(Buffer.from("privatekey"));
+    expect(noise.tag()).to.equal('/noise');
+    expect(typeof(noise.encrypt)).to.equal('function');
   })
 });