diff --git a/openvidu-server/src/main/java/io/openvidu/server/core/SessionManager.java b/openvidu-server/src/main/java/io/openvidu/server/core/SessionManager.java
index fb126d7a..9f886d29 100644
--- a/openvidu-server/src/main/java/io/openvidu/server/core/SessionManager.java
+++ b/openvidu-server/src/main/java/io/openvidu/server/core/SessionManager.java
@@ -28,6 +28,7 @@ import java.util.stream.Collectors;
 
 import javax.annotation.PreDestroy;
 
+import org.apache.commons.lang3.RandomStringUtils;
 import org.kurento.jsonrpc.message.Request;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -48,7 +49,6 @@ import io.openvidu.server.kurento.core.KurentoTokenOptions;
 import io.openvidu.server.recording.service.RecordingManager;
 import io.openvidu.server.utils.FormatChecker;
 import io.openvidu.server.utils.GeoLocation;
-import io.openvidu.server.utils.RandomStringGenerator;
 
 public abstract class SessionManager {
 
@@ -348,12 +348,12 @@ public abstract class SessionManager {
 	public Participant newParticipant(String sessionId, String participantPrivatetId, Token token,
 			String clientMetadata, GeoLocation location, String platform, String finalUserId) {
 		if (this.sessionidParticipantpublicidParticipant.get(sessionId) != null) {
-			String participantPublicId = RandomStringGenerator.generateRandomChain();
+			String participantPublicId = RandomStringUtils.randomAlphanumeric(16).toLowerCase();
 			Participant p = new Participant(finalUserId, participantPrivatetId, participantPublicId, sessionId, token,
 					clientMetadata, location, platform, null);
 			while (this.sessionidParticipantpublicidParticipant.get(sessionId).putIfAbsent(participantPublicId,
 					p) != null) {
-				participantPublicId = RandomStringGenerator.generateRandomChain();
+				participantPublicId = RandomStringUtils.randomAlphanumeric(16).toLowerCase();
 				p.setParticipantPublicId(participantPublicId);
 			}
 
diff --git a/openvidu-server/src/main/java/io/openvidu/server/core/TokenGeneratorDefault.java b/openvidu-server/src/main/java/io/openvidu/server/core/TokenGeneratorDefault.java
index dda17ad4..433ff816 100644
--- a/openvidu-server/src/main/java/io/openvidu/server/core/TokenGeneratorDefault.java
+++ b/openvidu-server/src/main/java/io/openvidu/server/core/TokenGeneratorDefault.java
@@ -17,6 +17,7 @@
 
 package io.openvidu.server.core;
 
+import org.apache.commons.lang3.RandomStringUtils;
 import org.springframework.beans.factory.annotation.Autowired;
 
 import io.openvidu.java.client.OpenViduRole;
@@ -25,7 +26,6 @@ import io.openvidu.server.config.OpenviduConfig;
 import io.openvidu.server.coturn.CoturnCredentialsService;
 import io.openvidu.server.coturn.TurnCredentials;
 import io.openvidu.server.kurento.core.KurentoTokenOptions;
-import io.openvidu.server.utils.RandomStringGenerator;
 
 public class TokenGeneratorDefault implements TokenGenerator {
 
@@ -40,7 +40,7 @@ public class TokenGeneratorDefault implements TokenGenerator {
 			KurentoTokenOptions kurentoTokenOptions) {
 		String token = OpenViduServer.wsUrl;
 		token += "?sessionId=" + sessionId;
-		token += "&token=" + RandomStringGenerator.generateRandomChain();
+		token += "&token=" + RandomStringUtils.randomAlphanumeric(16).toLowerCase();
 		token += "&role=" + role.name();
 		token += "&version=" + openviduConfig.getOpenViduServerVersion();
 		TurnCredentials turnCredentials = null;
diff --git a/openvidu-server/src/main/java/io/openvidu/server/rest/SessionRestController.java b/openvidu-server/src/main/java/io/openvidu/server/rest/SessionRestController.java
index 38ad46f5..71222b91 100644
--- a/openvidu-server/src/main/java/io/openvidu/server/rest/SessionRestController.java
+++ b/openvidu-server/src/main/java/io/openvidu/server/rest/SessionRestController.java
@@ -21,6 +21,7 @@ import java.util.Collection;
 import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
+import org.apache.commons.lang3.RandomStringUtils;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
@@ -57,7 +58,6 @@ import io.openvidu.server.core.SessionManager;
 import io.openvidu.server.kurento.core.KurentoTokenOptions;
 import io.openvidu.server.recording.Recording;
 import io.openvidu.server.recording.service.RecordingManager;
-import io.openvidu.server.utils.RandomStringGenerator;
 
 /**
  *
@@ -155,7 +155,7 @@ public class SessionRestController {
 			}
 			sessionId = customSessionId;
 		} else {
-			sessionId = RandomStringGenerator.generateRandomChain();
+			sessionId = RandomStringUtils.randomAlphanumeric(16).toLowerCase();
 			sessionManager.sessionidTokenTokenobj.putIfAbsent(sessionId, new ConcurrentHashMap<>());
 		}
 
diff --git a/openvidu-server/src/main/java/io/openvidu/server/rpc/RpcHandler.java b/openvidu-server/src/main/java/io/openvidu/server/rpc/RpcHandler.java
index d0f72205..63082466 100644
--- a/openvidu-server/src/main/java/io/openvidu/server/rpc/RpcHandler.java
+++ b/openvidu-server/src/main/java/io/openvidu/server/rpc/RpcHandler.java
@@ -26,6 +26,7 @@ import java.util.concurrent.ConcurrentMap;
 
 import javax.servlet.http.HttpSession;
 
+import org.apache.commons.lang3.RandomStringUtils;
 import org.kurento.jsonrpc.DefaultJsonRpcHandler;
 import org.kurento.jsonrpc.Session;
 import org.kurento.jsonrpc.Transaction;
@@ -52,7 +53,6 @@ import io.openvidu.server.core.SessionManager;
 import io.openvidu.server.core.Token;
 import io.openvidu.server.utils.GeoLocation;
 import io.openvidu.server.utils.GeoLocationByIp;
-import io.openvidu.server.utils.RandomStringGenerator;
 
 public class RpcHandler extends DefaultJsonRpcHandler<JsonObject> {
 
@@ -231,7 +231,7 @@ public class RpcHandler extends DefaultJsonRpcHandler<JsonObject> {
 
 		if (openviduConfig.isOpenViduSecret(secret)) {
 			sessionManager.newInsecureParticipant(participantPrivatetId);
-			token = RandomStringGenerator.generateRandomChain();
+			token = RandomStringUtils.randomAlphanumeric(16).toLowerCase();
 			if (recorder) {
 				generateRecorderParticipant = true;
 			}
diff --git a/openvidu-server/src/main/java/io/openvidu/server/utils/RandomStringGenerator.java b/openvidu-server/src/main/java/io/openvidu/server/utils/RandomStringGenerator.java
deleted file mode 100644
index 0bc65f0c..00000000
--- a/openvidu-server/src/main/java/io/openvidu/server/utils/RandomStringGenerator.java
+++ /dev/null
@@ -1,32 +0,0 @@
-/*
- * (C) Copyright 2017-2019 OpenVidu (https://openvidu.io/)
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *   http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- *
- */
-
-package io.openvidu.server.utils;
-
-import org.apache.commons.lang3.RandomStringUtils;
-
-public class RandomStringGenerator {
-
-	public static String generateRandomChain() {
-		return RandomStringUtils.randomAlphanumeric(16).toLowerCase();
-	}
-
-	public static String generateRandomChain(int length) {
-		return RandomStringUtils.randomAlphanumeric(length).toLowerCase();
-	}
-
-}