diff --git a/repository/src/main/java/org/alfresco/repo/security/authentication/identityservice/IdentityServiceConfig.java b/repository/src/main/java/org/alfresco/repo/security/authentication/identityservice/IdentityServiceConfig.java
index cb3d8878e5..f0b618869b 100644
--- a/repository/src/main/java/org/alfresco/repo/security/authentication/identityservice/IdentityServiceConfig.java
+++ b/repository/src/main/java/org/alfresco/repo/security/authentication/identityservice/IdentityServiceConfig.java
@@ -58,6 +58,7 @@ public class IdentityServiceConfig implements InitializingBean
     private String clientKeystore;
     private String clientKeystorePassword;
     private String clientKeyPassword;
+    private String realmKey;
 
     public void setGlobalProperties(Properties globalProperties)
     {
@@ -229,4 +230,14 @@ public class IdentityServiceConfig implements InitializingBean
     {
         return clientKeyPassword;
     }
+
+    public void setRealmKey(String realmKey)
+    {
+        this.realmKey = realmKey;
+    }
+
+    public String getRealmKey()
+    {
+        return realmKey;
+    }
 }
diff --git a/repository/src/main/java/org/alfresco/repo/security/authentication/identityservice/IdentityServiceFacadeFactoryBean.java b/repository/src/main/java/org/alfresco/repo/security/authentication/identityservice/IdentityServiceFacadeFactoryBean.java
index 2d1b2fb721..b1fbca113b 100644
--- a/repository/src/main/java/org/alfresco/repo/security/authentication/identityservice/IdentityServiceFacadeFactoryBean.java
+++ b/repository/src/main/java/org/alfresco/repo/security/authentication/identityservice/IdentityServiceFacadeFactoryBean.java
@@ -29,8 +29,12 @@ import static java.util.Objects.requireNonNull;
 import static java.util.Optional.ofNullable;
 import static java.util.function.Predicate.not;
 
+import java.io.ByteArrayInputStream;
 import java.io.File;
+import java.io.InputStream;
 import java.net.URI;
+import java.nio.charset.StandardCharsets;
+import java.security.interfaces.RSAPublicKey;
 import java.time.Duration;
 import java.time.temporal.ChronoUnit;
 import java.util.Arrays;
@@ -63,10 +67,12 @@ import org.springframework.http.ResponseEntity;
 import org.springframework.http.client.ClientHttpRequestFactory;
 import org.springframework.http.client.HttpComponentsClientHttpRequestFactory;
 import org.springframework.http.converter.FormHttpMessageConverter;
+import org.springframework.security.converter.RsaKeyConverters;
 import org.springframework.security.oauth2.client.http.OAuth2ErrorResponseErrorHandler;
 import org.springframework.security.oauth2.client.oidc.authentication.OidcIdTokenDecoderFactory;
 import org.springframework.security.oauth2.client.registration.ClientRegistration;
 import org.springframework.security.oauth2.client.registration.ClientRegistration.Builder;
+import org.springframework.security.oauth2.client.registration.ClientRegistration.ProviderDetails;
 import org.springframework.security.oauth2.core.AuthorizationGrantType;
 import org.springframework.security.oauth2.core.ClientAuthenticationMethod;
 import org.springframework.security.oauth2.core.DelegatingOAuth2TokenValidator;
@@ -109,7 +115,7 @@ public class IdentityServiceFacadeFactoryBean implements FactoryBean<IdentitySer
         factory = new SpringBasedIdentityServiceFacadeFactory(
                 new HttpClientProvider(identityServiceConfig)::createHttpClient,
                 new ClientRegistrationProvider(identityServiceConfig)::createClientRegistration,
-                new JwtDecoderProvider()::createJwtDecoder
+                new JwtDecoderProvider(identityServiceConfig)::createJwtDecoder
         );
     }
 
@@ -196,12 +202,12 @@ public class IdentityServiceFacadeFactoryBean implements FactoryBean<IdentitySer
     {
         private final Supplier<HttpClient> httpClientProvider;
         private final Function<RestOperations, ClientRegistration> clientRegistrationProvider;
-        private final BiFunction<RestOperations, ClientRegistration, JwtDecoder> jwtDecoderProvider;
+        private final BiFunction<RestOperations, ProviderDetails, JwtDecoder> jwtDecoderProvider;
 
         SpringBasedIdentityServiceFacadeFactory(
                 Supplier<HttpClient> httpClientProvider,
                 Function<RestOperations, ClientRegistration> clientRegistrationProvider,
-                BiFunction<RestOperations, ClientRegistration, JwtDecoder> jwtDecoderProvider)
+                BiFunction<RestOperations, ProviderDetails, JwtDecoder> jwtDecoderProvider)
         {
             this.httpClientProvider = Objects.requireNonNull(httpClientProvider);
             this.clientRegistrationProvider = Objects.requireNonNull(clientRegistrationProvider);
@@ -217,7 +223,7 @@ public class IdentityServiceFacadeFactoryBean implements FactoryBean<IdentitySer
             final ClientHttpRequestFactory httpRequestFactory = new HttpComponentsClientHttpRequestFactory(httpClientProvider.get());
             final RestTemplate restTemplate = new RestTemplate(httpRequestFactory);
             final ClientRegistration clientRegistration = clientRegistrationProvider.apply(restTemplate);
-            final JwtDecoder jwtDecoder = jwtDecoderProvider.apply(restTemplate, clientRegistration);
+            final JwtDecoder jwtDecoder = jwtDecoderProvider.apply(restTemplate, clientRegistration.getProviderDetails());
 
             return new SpringBasedIdentityServiceFacade(createOAuth2RestTemplate(httpRequestFactory), clientRegistration, jwtDecoder);
         }
@@ -246,6 +252,7 @@ public class IdentityServiceFacadeFactoryBean implements FactoryBean<IdentitySer
             try
             {
                 HttpClientBuilder clientBuilder = HttpClients.custom();
+
                 clientBuilder = applyConnectionConfiguration(clientBuilder);
                 clientBuilder = applySSLConfiguration(clientBuilder);
 
@@ -389,54 +396,100 @@ public class IdentityServiceFacadeFactoryBean implements FactoryBean<IdentitySer
         }
     }
 
-    private static class JwtDecoderProvider
+    static class JwtDecoderProvider
     {
         private static final SignatureAlgorithm SIGNATURE_ALGORITHM = SignatureAlgorithm.RS256;
+        private final IdentityServiceConfig config;
 
-        public JwtDecoder createJwtDecoder(RestOperations rest, ClientRegistration clientRegistration)
+        JwtDecoderProvider(IdentityServiceConfig config)
+        {
+            this.config = Objects.requireNonNull(config);
+        }
+
+        public JwtDecoder createJwtDecoder(RestOperations rest, ProviderDetails providerDetails)
         {
             try
             {
-                final String jwkSetUri = requireValidJwkSetUri(clientRegistration);
-                final NimbusJwtDecoder decoder = NimbusJwtDecoder.withJwkSetUri(jwkSetUri)
-                                                                 .jwsAlgorithm(SIGNATURE_ALGORITHM)
-                                                                 .restOperations(rest)
-                                                                 .build();
+                final NimbusJwtDecoder decoder = buildJwtDecoder(rest, providerDetails);
 
-                decoder.setJwtValidator(createJwtTokenValidator(clientRegistration));
+                decoder.setJwtValidator(createJwtTokenValidator(providerDetails));
                 decoder.setClaimSetConverter(new ClaimTypeConverter(OidcIdTokenDecoderFactory.createDefaultClaimTypeConverters()));
 
                 return decoder;
-            }
-            catch (RuntimeException e)
+            } catch (RuntimeException e)
             {
                 LOGGER.warn("Failed to create JwtDecoder.", e);
                 throw authorizationServerCantBeUsedException(e);
             }
         }
 
-        private String requireValidJwkSetUri(ClientRegistration clientRegistration)
+        private NimbusJwtDecoder buildJwtDecoder(RestOperations rest, ProviderDetails providerDetails)
         {
-            final String uri = clientRegistration.getProviderDetails().getJwkSetUri();
+            if (isDefined(config.getRealmKey()))
+            {
+                final RSAPublicKey publicKey = parsePublicKey(config.getRealmKey());
+                return NimbusJwtDecoder.withPublicKey(publicKey)
+                                       .signatureAlgorithm(SIGNATURE_ALGORITHM)
+                                       .build();
+            }
+
+            final String jwkSetUri = requireValidJwkSetUri(providerDetails);
+            return NimbusJwtDecoder.withJwkSetUri(jwkSetUri)
+                                   .jwsAlgorithm(SIGNATURE_ALGORITHM)
+                                   .restOperations(rest)
+                                   .build();
+        }
+
+        private OAuth2TokenValidator<Jwt> createJwtTokenValidator(ProviderDetails providerDetails)
+        {
+            return new DelegatingOAuth2TokenValidator<>(
+                    new JwtTimestampValidator(Duration.of(0, ChronoUnit.MILLIS)),
+                    new JwtIssuerValidator(providerDetails.getIssuerUri()),
+                    new JwtClaimValidator<String>("typ", "Bearer"::equals),
+                    new JwtClaimValidator<String>(JwtClaimNames.SUB, Objects::nonNull));
+        }
+
+        private RSAPublicKey parsePublicKey(String pem)
+        {
+            try
+            {
+                return tryToParsePublicKey(pem);
+            }
+            catch (Exception e)
+            {
+                if (isPemFormatException(e))
+                {
+                    //For backward compatibility with Keycloak adapter
+                    return tryToParsePublicKey("-----BEGIN PUBLIC KEY-----\n" + pem + "\n-----END PUBLIC KEY-----");
+                }
+                throw e;
+            }
+        }
+
+        private RSAPublicKey tryToParsePublicKey(String pem)
+        {
+            final InputStream pemStream = new ByteArrayInputStream(pem.getBytes(StandardCharsets.UTF_8));
+            return RsaKeyConverters.x509().convert(pemStream);
+        }
+
+        private boolean isPemFormatException(Exception e)
+        {
+            return e.getMessage() != null && e.getMessage().contains("-----BEGIN PUBLIC KEY-----");
+        }
+
+        private String requireValidJwkSetUri(ProviderDetails providerDetails)
+        {
+            final String uri = providerDetails.getJwkSetUri();
             if (!isDefined(uri)) {
                 OAuth2Error oauth2Error = new OAuth2Error("missing_signature_verifier",
-                        "Failed to find a Signature Verifier for Client Registration: '"
-                                + clientRegistration.getRegistrationId()
+                        "Failed to find a Signature Verifier for: '"
+                                + providerDetails.getIssuerUri()
                                 + "'. Check to ensure you have configured the JwkSet URI.",
                         null);
                 throw new OAuth2AuthenticationException(oauth2Error, oauth2Error.toString());
             }
             return uri;
         }
-
-        private OAuth2TokenValidator<Jwt> createJwtTokenValidator(ClientRegistration clientRegistration)
-        {
-            return new DelegatingOAuth2TokenValidator<>(
-                    new JwtTimestampValidator(Duration.of(0, ChronoUnit.MILLIS)),
-                    new JwtIssuerValidator(clientRegistration.getProviderDetails().getIssuerUri()),
-                    new JwtClaimValidator<String>("typ", "Bearer"::equals),
-                    new JwtClaimValidator<String>(JwtClaimNames.SUB, Objects::nonNull));
-        }
     }
 
     private static boolean isDefined(String value)
diff --git a/repository/src/main/resources/alfresco/subsystems/Authentication/identity-service/identity-service-authentication-context.xml b/repository/src/main/resources/alfresco/subsystems/Authentication/identity-service/identity-service-authentication-context.xml
index 21a3092ad7..d60420109f 100644
--- a/repository/src/main/resources/alfresco/subsystems/Authentication/identity-service/identity-service-authentication-context.xml
+++ b/repository/src/main/resources/alfresco/subsystems/Authentication/identity-service/identity-service-authentication-context.xml
@@ -128,6 +128,9 @@
       <property name="clientSocketTimeout">
          <value>${identity-service.client-socket-timeout:2000}</value>
       </property>
+      <property name="realmKey">
+         <value>${identity-service.realm-public-key:#{null}}</value>
+      </property>
    </bean>
    
    <!-- Enable control over mapping between request and user ID -->
diff --git a/repository/src/test/java/org/alfresco/AllUnitTestsSuite.java b/repository/src/test/java/org/alfresco/AllUnitTestsSuite.java
index 3b2441f36e..999f2e16ca 100644
--- a/repository/src/test/java/org/alfresco/AllUnitTestsSuite.java
+++ b/repository/src/test/java/org/alfresco/AllUnitTestsSuite.java
@@ -2,7 +2,7 @@
  * #%L
  * Alfresco Repository
  * %%
- * Copyright (C) 2005 - 2022 Alfresco Software Limited
+ * Copyright (C) 2005 - 2023 Alfresco Software Limited
  * %%
  * This file is part of the Alfresco software. 
  * If the software was purchased under a paid Alfresco license, the terms of 
@@ -25,6 +25,7 @@
  */
 package org.alfresco;
 
+import org.alfresco.repo.security.authentication.identityservice.IdentityServiceFacadeFactoryBeanTest;
 import org.alfresco.repo.security.authentication.identityservice.LazyInstantiatingIdentityServiceFacadeUnitTest;
 import org.alfresco.repo.security.authentication.identityservice.SpringBasedIdentityServiceFacadeUnitTest;
 import org.alfresco.util.testing.category.DBTests;
@@ -138,6 +139,7 @@ import org.junit.runners.Suite;
     org.alfresco.repo.search.impl.solr.facet.FacetQNameUtilsTest.class,
     org.alfresco.util.BeanExtenderUnitTest.class,
     org.alfresco.repo.solr.SOLRTrackingComponentUnitTest.class,
+    IdentityServiceFacadeFactoryBeanTest.class,
     LazyInstantiatingIdentityServiceFacadeUnitTest.class,
     SpringBasedIdentityServiceFacadeUnitTest.class,
     org.alfresco.repo.security.authentication.CompositePasswordEncoderTest.class,
diff --git a/repository/src/test/java/org/alfresco/repo/security/authentication/identityservice/IdentityServiceFacadeFactoryBeanTest.java b/repository/src/test/java/org/alfresco/repo/security/authentication/identityservice/IdentityServiceFacadeFactoryBeanTest.java
new file mode 100644
index 0000000000..bf107e68bc
--- /dev/null
+++ b/repository/src/test/java/org/alfresco/repo/security/authentication/identityservice/IdentityServiceFacadeFactoryBeanTest.java
@@ -0,0 +1,65 @@
+/*
+ * #%L
+ * Alfresco Repository
+ * %%
+ * Copyright (C) 2005 - 2023 Alfresco Software Limited
+ * %%
+ * This file is part of the Alfresco software.
+ * If the software was purchased under a paid Alfresco license, the terms of
+ * the paid license agreement will prevail.  Otherwise, the software is
+ * provided under the following open source license terms:
+ *
+ * Alfresco is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Alfresco is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
+ * #L%
+ */
+package org.alfresco.repo.security.authentication.identityservice;
+
+import static org.alfresco.repo.security.authentication.identityservice.IdentityServiceRemoteUserMapper.USERNAME_CLAIM;
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.mockito.Mockito.mock;
+import static org.mockito.Mockito.when;
+
+import java.util.Map;
+
+import org.alfresco.repo.security.authentication.identityservice.IdentityServiceFacadeFactoryBean.JwtDecoderProvider;
+import org.junit.Test;
+import org.springframework.security.oauth2.client.registration.ClientRegistration.ProviderDetails;
+import org.springframework.security.oauth2.jwt.Jwt;
+import org.springframework.security.oauth2.jwt.JwtDecoder;
+
+public class IdentityServiceFacadeFactoryBeanTest
+{
+    @Test
+    public void shouldCreateJwtDecoderWithoutIDSWhenPublicKeyIsProvided()
+    {
+        final IdentityServiceConfig config = mock(IdentityServiceConfig.class);
+        when(config.getRealmKey()).thenReturn("MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAve3MabX/rp3LbE7/zNqKxuid8WT7y4qSXsNaiPvl/OVbNWW/cu5td1VndItYhH6/gL7Z5W/r4MOeTlz/fOdXfjrRJou2f3UiPQwLV9RdOH3oS4/BUe+sviD8Q3eRfWBWWz3yw8f2YNtD4bMztIMMjqthvwdEEb9S9jbxxD0o71Bsrz/FwPi7HhSDA+Z/p01Hct8m4wx13ZlKRd4YjyC12FBmi9MSgsrFuWzyQHhHTeBDoALpfuiut3rhVxUtFmVTpy6p9vil7C5J5pok4MXPH0dJCyDNQz05ww5+fD+tfksIEpFeokRpN226F+P21oQVFUWwYIaXaFlG/hfvwmnlfQIDAQAB");
+
+        final ProviderDetails providerDetails = mock(ProviderDetails.class);
+        when(providerDetails.getIssuerUri()).thenReturn("https://my.issuer");
+
+        final JwtDecoderProvider provider = new JwtDecoderProvider(config);
+
+        final JwtDecoder decoder = provider.createJwtDecoder(null, providerDetails);
+
+        final Jwt decodedToken = decoder.decode("eyJhbGciOiJSUzI1NiJ9.eyJleHAiOjIxNDc0ODM2NDcsImp0aSI6IjEyMzQiLCJpc3MiOiJodHRwczovL215Lmlzc3VlciIsInN1YiI6ImFiYzEyMyIsInR5cCI6IkJlYXJlciIsInByZWZlcnJlZF91c2VybmFtZSI6InBpb3RyZWsifQ.k_KaOrLLh3QsT8mKphkcz2vKpulgxp92UoEDccpHJ1mxE3Pa3gFXPKTj4goUBKXieGPZRMvBDhfWNxMvRYZPiQr2NXJKapkh0bTd0qoaSWz9ICe9Nu3eg7_VA_nwUVPz_35wwmrxgVk0_kpUYQN_VtaO7ZgFE2sJzFjbkVls5aqfAMnEjEgQl837hqZvmlW2ZRWebtxXfQxAjtp0gcTg-xtAHKIINYo_1_uAtt_H9L8KqFaioxrVAEDDIlcKnb-Ks3Y62CrZauaGUJeN_aNj2gdOpdkhvCw79yJyZSGZ7okjGbidCNSAf7Bo2Y6h3dP1Gga7kRmD648ftZESrNvbyg");
+        assertThat(decodedToken).isNotNull();
+
+        final Map<String, Object> claims = decodedToken.getClaims();
+        assertThat(claims).isNotNull()
+                          .isNotEmpty()
+                          .containsEntry(USERNAME_CLAIM, "piotrek");
+    }
+
+}
\ No newline at end of file