diff --git a/src/main/java/com/loafle/overflow/central/module/noauthprobe/service/CentralNoAuthProbeService.java b/src/main/java/com/loafle/overflow/central/module/noauthprobe/service/CentralNoAuthProbeService.java
index 0b70c9f..b1f8fe2 100644
--- a/src/main/java/com/loafle/overflow/central/module/noauthprobe/service/CentralNoAuthProbeService.java
+++ b/src/main/java/com/loafle/overflow/central/module/noauthprobe/service/CentralNoAuthProbeService.java
@@ -27,6 +27,8 @@ import com.loafle.overflow.service.central.probe.ProbeHostService;
 import com.loafle.overflow.service.central.probe.ProbeService;
 
 import com.fasterxml.jackson.databind.ObjectMapper;
+
+import org.apache.commons.lang.RandomStringUtils;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.stereotype.Service;
 
@@ -36,7 +38,6 @@ import inet.ipaddr.IPAddressString;
 import java.io.IOException;
 import java.util.Date;
 import java.util.List;
-import java.util.UUID;
 
 import javax.transaction.Transactional;
 
@@ -156,7 +157,7 @@ public class CentralNoAuthProbeService implements NoAuthProbeService {
     DomainMember domainMember = domainMemberService.readByMemberEmail(memberEmail);
 
     Probe probe = new Probe();
-    probe.setEncryptionKey(UUID.randomUUID().toString() + UUID.randomUUID().toString());
+    probe.setEncryptionKey(RandomStringUtils.randomAlphanumeric(8));
     probe.setProbeKey(GenerateKey.getKey());
     probe.setDomain(new Domain(apiKey.getDomain().getId()));
     probe.setAuthorizeMember(new Member(domainMember.getMember().getId()));
diff --git a/src/main/java/com/loafle/overflow/central/module/sensor/service/CentralSensorConfigService.java b/src/main/java/com/loafle/overflow/central/module/sensor/service/CentralSensorConfigService.java
index edb7270..a235c42 100644
--- a/src/main/java/com/loafle/overflow/central/module/sensor/service/CentralSensorConfigService.java
+++ b/src/main/java/com/loafle/overflow/central/module/sensor/service/CentralSensorConfigService.java
@@ -69,15 +69,16 @@ public class CentralSensorConfigService {
   }
 
   private String toEncryptString(SensorConfig sensorConfig, String encryptKey) throws OverflowException {
+
     try {
       String sensorConfigJsonStr = this.objectMapper.writeValueAsString(sensorConfig);
       // gzip
-      ByteArrayOutputStream obj = new ByteArrayOutputStream();
-      GZIPOutputStream gzip = new GZIPOutputStream(obj);
+      ByteArrayOutputStream bos = new ByteArrayOutputStream();
+      GZIPOutputStream gzip = new GZIPOutputStream(bos);
       gzip.write(sensorConfigJsonStr.getBytes("UTF-8"));
       gzip.flush();
       gzip.close();
-      byte[] compressedByte = obj.toByteArray();
+      byte[] compressedByte = bos.toByteArray();
 
       // DES encryption
       Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
@@ -98,22 +99,21 @@ public class CentralSensorConfigService {
   /*
    * private String testDecrypt(String encryptKey, String encrypted) throws
    * OverflowException { try { byte[] inputBytes =
-   * Base64.getDecoder().decode(encrypted.getBytes());
-   *
-   * Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding"); SecretKeyFactory
-   * keyFactory = SecretKeyFactory.getInstance("DES"); DESKeySpec desKeySpec = new
+   * Base64.getDecoder().decode(encrypted);
+   * 
+   * Cipher cipher = Cipher.getInstance("DES"); SecretKeyFactory keyFactory =
+   * SecretKeyFactory.getInstance("DES"); DESKeySpec desKeySpec = new
    * DESKeySpec(encryptKey.getBytes()); cipher.init(Cipher.DECRYPT_MODE,
-   * keyFactory.generateSecret(desKeySpec));
-   *
-   * byte[] outputBytes = cipher.doFinal(inputBytes);
-   *
+   * keyFactory.generateSecret(desKeySpec)); byte[] outputBytes =
+   * cipher.doFinal(inputBytes);
+   * 
    * GZIPInputStream gis = new GZIPInputStream(new
    * ByteArrayInputStream(outputBytes)); BufferedReader bf = new
    * BufferedReader(new InputStreamReader(gis, "UTF-8")); String result = "";
    * String line; while ((line = bf.readLine()) != null) { result += line; }
-   *
+   * 
    * return result;
-   *
+   * 
    * } catch (Exception e) { throw new OverflowException("", e); } }
    */