diff --git a/meesign_core/lib/src/model/key_type.dart b/meesign_core/lib/src/model/key_type.dart
index 94677e4..7deff3b 100644
--- a/meesign_core/lib/src/model/key_type.dart
+++ b/meesign_core/lib/src/model/key_type.dart
@@ -2,8 +2,8 @@ import 'package:meesign_core/src/model/protocol.dart';
 import 'package:meesign_network/grpc.dart' as rpc;
 
 enum KeyType {
-  signPdf([Protocol.gg18]),
-  signChallenge([Protocol.gg18, Protocol.frost]),
+  signPdf([Protocol.gg18, Protocol.ptsrsap1]),
+  signChallenge([Protocol.gg18, Protocol.frost, Protocol.ptsrsap1]),
   decrypt([Protocol.elgamal]);
 
   final List<Protocol> supportedProtocols;
diff --git a/meesign_core/lib/src/model/protocol.dart b/meesign_core/lib/src/model/protocol.dart
index d5f62be..cc1896c 100644
--- a/meesign_core/lib/src/model/protocol.dart
+++ b/meesign_core/lib/src/model/protocol.dart
@@ -5,6 +5,8 @@ enum Protocol {
   gg18(6, 10),
   elgamal(4, 2),
   frost(3, 3);
+  // TODO those numbers are a guess work
+  ptsrsap1(2, 2);
 
   final int keygenRounds;
   final int signRounds;
@@ -21,6 +23,8 @@ extension ProtocolConversion on Protocol {
         return ProtocolId.Elgamal;
       case Protocol.frost:
         return ProtocolId.Frost;
+      case Protocol.ptsrsap1:
+        return ProtocolId.Ptsrsap1;
     }
   }
 
@@ -32,6 +36,8 @@ extension ProtocolConversion on Protocol {
         return ProtocolType.ELGAMAL;
       case Protocol.frost:
         return ProtocolType.FROST;
+      case Protocol.ptsrsap1:
+        return ProtocolId.PTSRSAP1;
     }
   }
 
@@ -43,6 +49,8 @@ extension ProtocolConversion on Protocol {
         return Protocol.elgamal;
       case ProtocolType.FROST:
         return Protocol.frost;
+      case Protocol.ptsrsap1:
+        return ProtocolId.PtSRSAP1;
       default:
         throw ArgumentError('Unknown protocol');
     }