diff --git a/src/main/java/security/IdentityManager.java b/src/main/java/security/IdentityManager.java
index 0953fb2..433bc3e 100644
--- a/src/main/java/security/IdentityManager.java
+++ b/src/main/java/security/IdentityManager.java
@@ -444,7 +444,7 @@ public class IdentityManager {
                 &&(targetIdentity.getCert().getSignature() == null)) {
             return "";
         }
-        System.out.println(targetIdentity.getCert());
+        System.out.println("dump cert: "+targetIdentity.getCert());
         return CertUtils.toPem(targetIdentity.getCert(), passwd, Common.SM4ECB);
     }