diff --git a/loc_chain_app/lib/util/transaction_manager.dart b/loc_chain_app/lib/util/transaction_manager.dart
index d882d38..c7e27a5 100644
--- a/loc_chain_app/lib/util/transaction_manager.dart
+++ b/loc_chain_app/lib/util/transaction_manager.dart
@@ -2,6 +2,7 @@ import 'package:fast_rsa/model/bridge.pb.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 import 'package:sqflite/sqflite.dart';
 import 'package:fast_rsa/rsa.dart';
+import 'package:dbcrypt/dbcrypt.dart';
 
 import 'package:loc_chain_app/util/keyfile_manager.dart';
 
@@ -14,14 +15,14 @@ class Transaction {
   }
   late final String _id;
   final String hash;
-  static Future<String> signTransaction(String otherUserId) async {
+  static Future<String> generateHash(String otherUserId) async {
     String id = await SharedPreferences.getInstance()
         .then((s) => s.getString('userName') ?? '');
     bool idLess = id.compareTo(otherUserId) < 0;
     var lesser = idLess ? id : otherUserId;
     var greater = idLess ? otherUserId : id;
-    return RSA.signPKCS1v15("$lesser-$greater", Hash.HASH_SHA256,
-        KeyFileManager.keyPair.privateKey);
+    return DBCrypt()
+        .hashpw("$lesser-$greater", KeyFileManager.keyPair.privateKey);
   }
 }
 
diff --git a/loc_chain_app/pubspec.lock b/loc_chain_app/pubspec.lock
index 55b6fc5..da7c214 100644
--- a/loc_chain_app/pubspec.lock
+++ b/loc_chain_app/pubspec.lock
@@ -50,6 +50,13 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.0.2"
+  dbcrypt:
+    dependency: "direct main"
+    description:
+      name: dbcrypt
+      url: "https://pub.dartlang.org"
+    source: hosted
+    version: "2.0.0"
   fake_async:
     dependency: transitive
     description:
diff --git a/loc_chain_app/pubspec.yaml b/loc_chain_app/pubspec.yaml
index 727acdf..af472f5 100644
--- a/loc_chain_app/pubspec.yaml
+++ b/loc_chain_app/pubspec.yaml
@@ -32,6 +32,7 @@ dependencies:
   path_provider: ^2.0.1
   fast_rsa: ^1.4.0-nullsafety.4
   sqflite: ^2.0.0+3
+  dbcrypt: ^2.0.0
 
 dev_dependencies:
   flutter_test: