diff --git a/oiosaml/src/main/java/dk/gov/oio/saml/service/CredentialService.java b/oiosaml/src/main/java/dk/gov/oio/saml/service/CredentialService.java
index b5f1196..8c8900c 100644
--- a/oiosaml/src/main/java/dk/gov/oio/saml/service/CredentialService.java
+++ b/oiosaml/src/main/java/dk/gov/oio/saml/service/CredentialService.java
@@ -90,13 +90,15 @@ private BasicX509Credential getBasicX509Credential(String keystoreLocation, Stri
 
         KeyStore ks = keyStore(keystoreLocation, keystorePassword.toCharArray());
 
+        // OpenSAML's KeyStoreCredentialResolver looks up the key password by the alias
+        // supplied in the EntityIdCriterion below. Java's PKCS12 keystore lowercases
+        // aliases on load, so keying the password map by the keystore's stored alias
+        // broke whenever the configured alias used a different casing, surfacing as a
+        // misleading "incorrect keystore password" error (issue #73). Key it by the
+        // configured alias instead; PKCS12 key lookup is already case-insensitive, so
+        // alias resolution becomes fully case-insensitive.
         Map<String, String> passwords = new HashMap<>();
-        try {
-            passwords.put(ks.aliases().nextElement(), keystorePassword);
-        }
-        catch (KeyStoreException e) {
-            throw new InternalException("Keystore not initialized properly", e);
-        }
+        passwords.put(alias, keystorePassword);
 
         KeyStoreCredentialResolver resolver = new KeyStoreCredentialResolver(ks, passwords);
         CriteriaSet criteria = new CriteriaSet();
diff --git a/oiosaml/src/test/java/dk/gov/oio/saml/service/CredentialServiceTest.java b/oiosaml/src/test/java/dk/gov/oio/saml/service/CredentialServiceTest.java
new file mode 100644
index 0000000..d2d0a3a
--- /dev/null
+++ b/oiosaml/src/test/java/dk/gov/oio/saml/service/CredentialServiceTest.java
@@ -0,0 +1,47 @@
+package dk.gov.oio.saml.service;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.Test;
+import org.opensaml.core.config.InitializationService;
+import org.opensaml.security.x509.BasicX509Credential;
+
+import dk.gov.oio.saml.config.Configuration;
+import dk.gov.oio.saml.util.TestConstants;
+
+public class CredentialServiceTest {
+
+    // 'mixedcase-alias.p12' holds a single key entry created with the alias
+    // "TestKeyAlias". Java's PKCS12 keystore lowercases aliases on load, so
+    // configuring the alias with any other casing used to fail resolving the key
+    // and surfaced as a misleading "incorrect keystore password" error (issue #73).
+    private static final String MIXED_CASE_KEYSTORE = "mixedcase-alias.p12";
+    private static final String ALIAS_IN_DIFFERENT_CASE = "TestKeyAlias";
+
+    @BeforeAll
+    public static void initOpenSAML() throws Exception {
+        InitializationService.initialize();
+    }
+
+    @DisplayName("Keystore alias is resolved case-insensitively (issue #73)")
+    @Test
+    public void testKeystoreAliasIsCaseInsensitive() throws Exception {
+        String keystoreLocation = getClass().getClassLoader().getResource(MIXED_CASE_KEYSTORE).getFile();
+
+        Configuration config = new Configuration.Builder()
+                .setSpEntityID(TestConstants.SP_ENTITY_ID)
+                .setBaseUrl(TestConstants.SP_BASE_URL)
+                .setIdpEntityID(TestConstants.IDP_ENTITY_ID)
+                .setIdpMetadataUrl(TestConstants.IDP_METADATA_URL)
+                .setKeystoreLocation(keystoreLocation)
+                .setKeystorePassword("Test1234")
+                .setKeyAlias(ALIAS_IN_DIFFERENT_CASE)
+                .build();
+
+        CredentialService credentialService = new CredentialService(config);
+        BasicX509Credential credential = credentialService.getPrimaryBasicX509Credential();
+
+        Assertions.assertNotNull(credential, "Key should resolve regardless of the configured alias casing");
+    }
+}
diff --git a/oiosaml/src/test/resources/mixedcase-alias.p12 b/oiosaml/src/test/resources/mixedcase-alias.p12
new file mode 100644
index 0000000..4ca5f5d
Binary files /dev/null and b/oiosaml/src/test/resources/mixedcase-alias.p12 differ