diff --git a/src/main/java/burp/intruder/JWSPayloadProcessor.java b/src/main/java/burp/intruder/JWSPayloadProcessor.java
index 11cda73..706772e 100644
--- a/src/main/java/burp/intruder/JWSPayloadProcessor.java
+++ b/src/main/java/burp/intruder/JWSPayloadProcessor.java
@@ -80,17 +80,18 @@ public String displayName() {
 
     // Creates a JWS object from the given attributes. Signs the JWS if possible (i.e., available key selected in Intruder settings)
     private JWS createJWS(Base64URL header, Base64URL payload, Base64URL originalSignature) {
-        return this.loadKey().flatMap(key -> {
-            Optional<JWS> result = Optional.empty();
-
-            try {
-                // TODO - update alg within header
-                result = Optional.of(JWSFactory.sign(key, intruderConfig.signingAlgorithm(), header, payload));
-            } catch (SigningException ex) {
-                logging.logToError("Failed to sign JWS: " + ex);
-            }
-
-            return result;
-        }).orElseGet(() -> JWSFactory.jwsFromParts(header, payload, originalSignature));
+        return loadKey()
+                .flatMap(key -> {
+                    try {
+                        // TODO - update alg within header
+                        return Optional.of(JWSFactory.sign(key, intruderConfig.signingAlgorithm(), header, payload));
+                    } catch (SigningException ex) {
+                        logging.logToError("Failed to sign JWS: " + ex);
+                        return Optional.empty();
+                    }
+                })
+                .orElseGet(
+                        () -> JWSFactory.jwsFromParts(header, payload, originalSignature)
+                );
     }
 }
diff --git a/src/test/java/burp/intruder/IntruderConfigBuilder.java b/src/test/java/burp/intruder/IntruderConfigBuilder.java
index 7dc40d9..741849f 100644
--- a/src/test/java/burp/intruder/IntruderConfigBuilder.java
+++ b/src/test/java/burp/intruder/IntruderConfigBuilder.java
@@ -1,5 +1,7 @@
 package burp.intruder;
 
+import com.nimbusds.jose.JWSAlgorithm;
+
 class IntruderConfigBuilder {
     private final IntruderConfig config;
 
@@ -17,6 +19,21 @@ IntruderConfigBuilder withFuzzParameter(String parameterName) {
         return this;
     }
 
+    IntruderConfigBuilder withSigningKeyId(String signingId) {
+        config.setSigningKeyId(signingId);
+        return this;
+    }
+
+    IntruderConfigBuilder withSigningAlgorithm(JWSAlgorithm algorithm) {
+        config.setSigningAlgorithm(algorithm);
+        return this;
+    }
+
+    IntruderConfigBuilder withResigning(boolean resign) {
+        config.setResign(resign);
+        return this;
+    }
+
     IntruderConfig build() {
         return config;
     }
diff --git a/src/test/java/burp/intruder/JWSPayloadProcessorTest.java b/src/test/java/burp/intruder/JWSPayloadProcessorTest.java
index 79e9126..c600a67 100644
--- a/src/test/java/burp/intruder/JWSPayloadProcessorTest.java
+++ b/src/test/java/burp/intruder/JWSPayloadProcessorTest.java
@@ -21,6 +21,8 @@
 import static burp.intruder.FuzzLocation.PAYLOAD;
 import static burp.intruder.IntruderConfigBuilder.intruderConfig;
 import static com.blackberry.jwteditor.KeysModelBuilder.keysModel;
+import static com.nimbusds.jose.JWSAlgorithm.RS512;
+import static data.PemData.RSA1024Private;
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.ArgumentMatchers.any;
 import static org.mockito.ArgumentMatchers.anyString;
@@ -29,6 +31,7 @@
 @ExtendWith(MontoyaExtension.class)
 class JWSPayloadProcessorTest {
     private static final KeysModel EMPTY_KEYS_MODEL = keysModel().build();
+    private static final String KEY_ID = "id";
 
     @BeforeEach
     void configureMocks() {
@@ -105,4 +108,63 @@ void givenBaseValueJWSAndFuzzParameterPresentInPayload_whenPayloadProcessed_then
         assertThat(result.action()).isEqualTo(USE_PAYLOAD);
         assertThat(result.processedPayload().toString()).isEqualTo("eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6ImVtYW5vbiIsImlhdCI6MTUxNjIzOTAyMn0.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c");
     }
+
+    @Test
+    void givenBaseValueJWSAndFuzzParameterPresentInPayload_whenSigningKeyLoadedButResignOff_thenPayloadModifiedButNotResigned() {
+        String baseValue = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c";
+        PayloadData payloadData = payloadData().withBaseValue(baseValue).withCurrentPayload("emanon").build();
+        KeysModel keysModel = keysModel().withRSAKey(RSA1024Private, KEY_ID).build();
+        IntruderConfig intruderConfig = intruderConfig()
+                .withFuzzParameter("name")
+                .withFuzzLocation(PAYLOAD)
+                .withSigningKeyId(KEY_ID)
+                .withSigningAlgorithm(RS512)
+                .build();
+
+        JWSPayloadProcessor processor = new JWSPayloadProcessor(intruderConfig, LOGGING, keysModel);
+        PayloadProcessingResult result = processor.processPayload(payloadData);
+
+        assertThat(result.action()).isEqualTo(USE_PAYLOAD);
+        assertThat(result.processedPayload().toString()).isEqualTo("eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6ImVtYW5vbiIsImlhdCI6MTUxNjIzOTAyMn0.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c");
+    }
+
+    @Test
+    void givenBaseValueJWSAndFuzzParameterPresentInPayload_whenResignOnButUnknownSigningKeyConfigured_thenPayloadModifiedButNotResigned() {
+        String baseValue = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c";
+        PayloadData payloadData = payloadData().withBaseValue(baseValue).withCurrentPayload("emanon").build();
+        KeysModel keysModel = keysModel().withRSAKey(RSA1024Private, KEY_ID).build();
+        IntruderConfig intruderConfig = intruderConfig()
+                .withFuzzParameter("name")
+                .withFuzzLocation(PAYLOAD)
+                .withSigningKeyId("rogue")
+                .withSigningAlgorithm(RS512)
+                .withResigning(true)
+                .build();
+
+        JWSPayloadProcessor processor = new JWSPayloadProcessor(intruderConfig, LOGGING, keysModel);
+        PayloadProcessingResult result = processor.processPayload(payloadData);
+
+        assertThat(result.action()).isEqualTo(USE_PAYLOAD);
+        assertThat(result.processedPayload().toString()).isEqualTo("eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6ImVtYW5vbiIsImlhdCI6MTUxNjIzOTAyMn0.SflKxwRJSMeKKF2QT4fwpMeJf36POk6yJV_adQssw5c");
+    }
+
+    @Test
+    void givenBaseValueJWSAndFuzzParameterPresentInPayload_whenResignOnAndSigningKeyPresentAndAlgorithmUnchanged_thenPayloadModifiedAndResignedButAlgUnchanged() {
+        String baseValue = "eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzUxMiJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6IkpvaG4gRG9lIiwiaWF0IjoxNTE2MjM5MDIyfQ.LX5A6Hu00jlQ2n8s1SoVL4BEPjMiF1zrEs3qRtV08sbmsqxXV8bc8LarGm8YZj2OuXWL7aOkdBc9ezOBi5bjxsrtiUmwo5VWlU5Y6PXqGwH5v7w0kpRckdd0IA3nbrR2SyLQ1L1pQJk2PzoCvEpspBPMxtIyrK5MTep3Yx1Xn3aiw3aE1cHzOwK0xBIg-RW5qK5PwPa4H8T7eOOSMytS6N4AiZbeiIVHBWxmjrdp8AuC_fmfM1TQA_O8gK_1QkK3jPWkmbbtb48ut6dxz3H_gvPkPzsRE96nQ1qcOlbJjN0URcR2Tc1ACwZO4VpY4gujo_LwTsLiKQcmq0glFA3SIw";
+        PayloadData payloadData = payloadData().withBaseValue(baseValue).withCurrentPayload("emanon").build();
+        KeysModel keysModel = keysModel().withRSAKey(RSA1024Private, KEY_ID).build();
+        IntruderConfig intruderConfig = intruderConfig()
+                .withFuzzParameter("name")
+                .withFuzzLocation(PAYLOAD)
+                .withSigningKeyId(KEY_ID)
+                .withSigningAlgorithm(RS512)
+                .withResigning(true)
+                .build();
+
+        JWSPayloadProcessor processor = new JWSPayloadProcessor(intruderConfig, LOGGING, keysModel);
+        PayloadProcessingResult result = processor.processPayload(payloadData);
+
+        assertThat(result.action()).isEqualTo(USE_PAYLOAD);
+        assertThat(result.processedPayload().toString()).isEqualTo("eyJ0eXAiOiJKV1QiLCJhbGciOiJSUzUxMiJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6ImVtYW5vbiIsImlhdCI6MTUxNjIzOTAyMn0.poPOxqjqp-CnC2b7eaf2QvfvAfawzp6k-P1QECIHN7KCTnFIlQbiJC4ZtLPH_0-o3HQcUGZbib3m1CVWeY21FIUTVUmOyjU8XuBohtBXRlXoaKXVWibrm5YiLC3yNQz5uAF-gdBB8ybvsmetK7JIZ8UvQdJ3mdvlAAW-3xFv8fs");
+    }
 }
\ No newline at end of file
diff --git a/src/test/java/com/blackberry/jwteditor/KeysModelBuilder.java b/src/test/java/com/blackberry/jwteditor/KeysModelBuilder.java
index b017ac1..5f80128 100644
--- a/src/test/java/com/blackberry/jwteditor/KeysModelBuilder.java
+++ b/src/test/java/com/blackberry/jwteditor/KeysModelBuilder.java
@@ -30,17 +30,29 @@ public class KeysModelBuilder {
     private final KeysModel model = new KeysModel();
 
     public KeysModelBuilder withECKey(String pem) {
-        model.addKey(loadECKey(pem, nextKeyId()));
+        return withECKey(pem, nextKeyId());
+    }
+
+    public KeysModelBuilder withECKey(String pem, String keyId) {
+        model.addKey(loadECKey(pem, keyId));
         return this;
     }
 
     public KeysModelBuilder withRSAKey(String pem) {
-        model.addKey(loadRSAKey(pem, nextKeyId()));
+        return withRSAKey(pem, nextKeyId());
+    }
+
+    public KeysModelBuilder withRSAKey(String pem, String keyId) {
+        model.addKey(loadRSAKey(pem, keyId));
         return this;
     }
 
     public KeysModelBuilder withOKPKey(String pem) {
-        model.addKey(loadOKPKey(pem, nextKeyId()));
+        return withOKPKey(pem, nextKeyId());
+    }
+
+    public KeysModelBuilder withOKPKey(String pem, String keyId) {
+        model.addKey(loadOKPKey(pem, keyId));
         return this;
     }