diff --git a/sheet02/a2/SignECDSA.java b/sheet02/a2/SignECDSA.java
index 3e53b75..a9b2dbb 100644
--- a/sheet02/a2/SignECDSA.java
+++ b/sheet02/a2/SignECDSA.java
@@ -1,5 +1,25 @@
 package sheet02.a2;
 
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.security.KeyPairGenerator;
+import java.security.Signature;
+import java.util.Base64;
+
 public class SignECDSA {
-    
+    public static void main(String[] args) throws Exception {
+        final var gen = KeyPairGenerator.getInstance("EC");
+        final var kp = gen.genKeyPair();
+
+        final var bytes = Files.readAllBytes(Path.of("plaintext.txt"));
+        final var sig = Signature.getInstance("SHA256withECDSA");
+        sig.initVerify(kp.getPublic());
+        sig.initSign(kp.getPrivate());
+        sig.update(bytes);
+        final var signature = sig.sign();
+
+        Files.write(Path.of("signature.txt"), Base64.getEncoder().encode(signature));
+        Files.write(Path.of("sign-key.pub"), Base64.getEncoder().encode(kp.getPublic().getEncoded()));
+        Files.write(Path.of("sign-key"), Base64.getEncoder().encode(kp.getPrivate().getEncoded()));
+    }
 }
diff --git a/sheet02/a2/VerifyECDSA.java b/sheet02/a2/VerifyECDSA.java
index c772ace..e093407 100644
--- a/sheet02/a2/VerifyECDSA.java
+++ b/sheet02/a2/VerifyECDSA.java
@@ -1,5 +1,28 @@
 package sheet02.a2;
 
+import java.security.KeyFactory;
+import java.security.Signature;
+import java.security.spec.X509EncodedKeySpec;
+import java.util.Base64;
+
 public class VerifyECDSA {
-    
+    public static void main(String[] args) throws Exception {
+        if (args.length < 3) {
+            System.out.println(
+                    "Please specify in the following order: Public Key (X509), Signature (Base64), Message (plain text)");
+            return;
+        }
+
+        final String PUBLIC_KEY = args[0];
+        final String SIGNATURE = args[1];
+        final String MESSAGE = args[2];
+
+        final var kf = KeyFactory.getInstance("EC");
+        final var pub = kf.generatePublic(new X509EncodedKeySpec(Base64.getDecoder().decode(PUBLIC_KEY)));
+
+        final var sig = Signature.getInstance("SHA256withECDSA");
+        sig.initVerify(pub);
+        sig.update(MESSAGE.getBytes());
+        System.out.println("Correct: " + sig.verify(Base64.getDecoder().decode(SIGNATURE)));
+    }
 }
diff --git a/sheet02/a2/plaintext.txt b/sheet02/a2/plaintext.txt
new file mode 100644
index 0000000..1cd3ee9
--- /dev/null
+++ b/sheet02/a2/plaintext.txt
@@ -0,0 +1,3 @@
+Julian
+Leonard
+Viktoria
\ No newline at end of file
diff --git a/sheet02/a2/verify-example.sh b/sheet02/a2/verify-example.sh
new file mode 100755
index 0000000..257fd7c
--- /dev/null
+++ b/sheet02/a2/verify-example.sh
@@ -0,0 +1 @@
+java VerifyECDSA.java "MFkwEwYHKoZIzj0CAQYIKoZIzj0DAQcDQgAEnSgO/uuSq9QHH/rrnSgXeQTKPMI8tjLhyJzevl9fLQZW/zXuHk9iThiKY/c2k52quUby3czAwL2l2HaRqcBXEg==" "MEUCIAzRvK3CNFqMTZxIgMd1uQ/XybtRKXFht9S4q8qUy/IbAiEA7EcFYuRbViVC/zzIRW78HekjRHZVn3DjHVUcKyJ5sXw=" "hello world"
\ No newline at end of file