diff --git a/pytools/gpgcard/gpgcard.py b/pytools/gpgcard/gpgcard.py
index eaf9109..39a761c 100644
--- a/pytools/gpgcard/gpgcard.py
+++ b/pytools/gpgcard/gpgcard.py
@@ -109,6 +109,7 @@ class GPGCard() :
         if device.startswith("ledger:"):
             self.token = getDongle(True)
             self.exchange = self._exchange_ledger
+            self.disconnect = self._disconnect_ledger
         elif device.startswith("pcsc:"):
             allreaders = readers()
             for r in allreaders:
@@ -120,6 +121,7 @@ class GPGCard() :
                     self.connection = r.createConnection()
                     self.connection.connect()
                     self.exchange = self._exchange_pcsc
+                    self.disconnect = self._disconnect_pcsc
                 else:
                     #print("No")
                     pass
@@ -127,6 +129,8 @@ class GPGCard() :
             print("No token")
 
 
+
+
     ### APDU  interface ###
     def _exchange_ledger(self,cmd,sw=0x9000):
         resp = b''
@@ -159,6 +163,14 @@ class GPGCard() :
         sw = (sw1<<8)|sw2
         #print("xch S resp: %s %.04x"%(binascii.hexlify(resp),sw))
         return resp,sw
+    
+    def _disconnect_ledger(self):
+        return self.token.close()        
+
+    def _disconnect_pcsc(self):
+        r = self.connection.disconnect()
+        #self.connection.releaseContext()
+        return r
 
     def select(self):
         apdu = binascii.unhexlify(b"00A4040006D27600012401")
diff --git a/sdk/usbd_ccid_if.c b/sdk/usbd_ccid_if.c
index fd07035..b212737 100644
--- a/sdk/usbd_ccid_if.c
+++ b/sdk/usbd_ccid_if.c
@@ -513,7 +513,7 @@ uint8_t SC_Secure(uint32_t dwLength, uint8_t bBWI, uint16_t wLevelParameter,
     case 0: // verify pin
       //ret_len = dwLength - 15;
       ret_len = 5;
-      os_memmove(G_io_apdu_buffer, pbuf+15, 5);
+      off = 15;
       break;
 
     case 1: // modify pin
@@ -531,7 +531,6 @@ uint8_t SC_Secure(uint32_t dwLength, uint8_t bBWI, uint16_t wLevelParameter,
       }
       //ret_len = dwLength - off;
       ret_len = 5;
-      os_memmove(G_io_apdu_buffer, pbuf+off, 5);
       break;
 
     default: // unsupported
@@ -540,7 +539,9 @@ uint8_t SC_Secure(uint32_t dwLength, uint8_t bBWI, uint16_t wLevelParameter,
       CCID_Send_Reply(&USBD_Device);
       return SLOTERROR_CMD_NOT_SUPPORTED;
   }
-  return SC_XferBlock(G_io_apdu_buffer, ret_len, &ret_len);
+  pbuf += off;
+  pbuf[0] = 0xEF; 
+  return SC_XferBlock(pbuf, ret_len, &ret_len);
 }
 
 // prepare the apdu to be processed by the application
diff --git a/src/gpg_data.c b/src/gpg_data.c
index f4e5905..2c1ac08 100644
--- a/src/gpg_data.c
+++ b/src/gpg_data.c
@@ -654,10 +654,27 @@ int gpg_apdu_put_data(unsigned int ref) {
     }
 
     /* ----------------- RC ----------------- */
-  case 0xD3:
-    sw = gpg_apdu_change_ref_data();
-    break;
+  case 0xD3: {
+    gpg_pin_t *pin;
 
+    pin = gpg_pin_get_pin(PIN_ID_RC);
+    if (G_gpg_vstate.io_length == 0) {
+      gpg_nvm_write(pin, NULL, sizeof(gpg_pin_t));
+
+    }
+    else if ((G_gpg_vstate.io_length > GPG_MAX_PW_LENGTH) ||
+             (G_gpg_vstate.io_length < 8)) {
+      THROW(SW_WRONG_DATA);
+      return SW_WRONG_DATA;
+    } else {
+      gpg_pin_set(pin,
+                  G_gpg_vstate.work.io_buffer+G_gpg_vstate.io_offset,
+                  G_gpg_vstate.io_length);
+    }
+    sw =  SW_OK;
+    break;
+  }
+  
     /* ----------------- UIF ----------------- */
   case 0xD6:
     ptr_v = G_gpg_vstate.kslot->sig.UIF;
diff --git a/src/gpg_dispatch.c b/src/gpg_dispatch.c
index 0bc7cc9..6e907b3 100644
--- a/src/gpg_dispatch.c
+++ b/src/gpg_dispatch.c
@@ -236,7 +236,7 @@ int gpg_dispatch() {
   unsigned int tag,t,l;
   int sw;
 
-  if ((G_gpg_vstate.io_cla != 0x00) && (G_gpg_vstate.io_cla != 0x10)) {
+  if ((G_gpg_vstate.io_cla != 0x00) && (G_gpg_vstate.io_cla != 0x10) && (G_gpg_vstate.io_cla != 0xEF)) {
     THROW(SW_CLA_NOT_SUPPORTED);
     return SW_CLA_NOT_SUPPORTED;
   }
@@ -271,7 +271,6 @@ int gpg_dispatch() {
   }
 
 
-
   /* Other commands allowed if not terminated */
   if (N_gpg_pstate->histo[7] != 0x07) {
     THROW(SW_STATE_TERMINATED);
diff --git a/src/gpg_init.c b/src/gpg_init.c
index 8aca2f7..03207b1 100644
--- a/src/gpg_init.c
+++ b/src/gpg_init.c
@@ -92,7 +92,7 @@ int gpg_oid2curve(unsigned char* oid, unsigned int len) {
 /* -------------------------------*/
 
 const unsigned char C_ext_capabilities[10] = {
-  //-SM, +getchallenge, +keyimport, +PWchangeable, +privateDO, +algAttrChangeable, +AES, -RFU
+  //-SM, +getchallenge, +keyimport, +PWchangeable, +privateDO, +algAttrChangeable, +AES, -KDF
   0x7E,
   // No SM,
   0x00,
@@ -104,8 +104,8 @@ const unsigned char C_ext_capabilities[10] = {
   SHORT(GPG_EXT_PRIVATE_DO_LENGTH),
   //PIN block formart 2 not supported
   0x00,
-  //RFU
-  0x00
+  //MSE
+  0x01
 
 };
 
diff --git a/src/gpg_io.c b/src/gpg_io.c
index 50a46cf..4fa85b1 100644
--- a/src/gpg_io.c
+++ b/src/gpg_io.c
@@ -247,7 +247,7 @@ int gpg_io_fetch(unsigned char* buffer, int len) {
 int gpg_io_do(unsigned int io_flags) {
 
   //if pending input chaining
-  if (G_gpg_vstate.io_cla & 0x01) {
+  if (G_gpg_vstate.io_cla & 0x10) {
     goto in_chaining;
   }
 
diff --git a/src/gpg_mse.c b/src/gpg_mse.c
new file mode 100644
index 0000000..d3cc88c
--- /dev/null
+++ b/src/gpg_mse.c
@@ -0,0 +1,78 @@
+/* Copyright 2017 Cedric Mesnil <cslashm@gmail.com>, Ledger SAS
+ *
+ * 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.
+ */
+
+#include "os.h"
+#include "cx.h"
+#include "gpg_types.h"
+#include "gpg_api.h"
+#include "gpg_vars.h"
+
+static int gpg_mse_set(int crt, int ref) {
+
+  if (crt == 0xA4) {
+    if (ref == 0x02) {
+        G_gpg_vstate.mse_aut = &G_gpg_vstate.kslot->dec;
+    }
+    if (ref == 0x03) {
+        G_gpg_vstate.mse_aut = &G_gpg_vstate.kslot->aut;
+    }
+  }
+
+  if (crt == 0xB8) {
+    if (ref == 0x02) {
+        G_gpg_vstate.mse_dec = &G_gpg_vstate.kslot->dec;
+    }
+    if (ref == 0x03) {
+        G_gpg_vstate.mse_dec = &G_gpg_vstate.kslot->aut;
+    }
+  }
+  return 0;
+}
+
+
+
+int gpg_mse_reset() {
+  gpg_mse_set(0xA4, 0x03);
+  gpg_mse_set(0xB8, 0x02);
+  return 0;
+}
+
+int gpg_apdu_mse() {
+  int crt,ref;
+  
+
+  if ((G_gpg_vstate.io_p1 != 0x41) || 
+      ((G_gpg_vstate.io_p2 != 0xA4)&&(G_gpg_vstate.io_p2 != 0xB8))) {
+    THROW(SW_INCORRECT_P1P2);
+    return SW_INCORRECT_P1P2;
+  }
+
+  crt =  gpg_io_fetch_u16();
+  if (crt != 0x8301) {
+    THROW(SW_WRONG_DATA);
+    return SW_WRONG_DATA;
+  }
+
+  ref =  gpg_io_fetch_u8();
+  if ((ref != 0x02) &&  (ref != 0x03)) {
+    THROW(SW_WRONG_DATA);
+    return SW_WRONG_DATA;
+  }
+
+  gpg_mse_set(crt,ref);
+  gpg_io_discard(1);
+  return SW_OK;
+
+}
\ No newline at end of file
diff --git a/src/gpg_pin.c b/src/gpg_pin.c
index e4fdb50..7def70f 100644
--- a/src/gpg_pin.c
+++ b/src/gpg_pin.c
@@ -83,6 +83,7 @@ static void gpg_pin_check_throw(gpg_pin_t *pin, int pinID,
     return;
   }
   THROW(sw);
+  return;
 }
 
 int gpg_pin_check(gpg_pin_t *pin, int pinID,
@@ -143,10 +144,8 @@ int gpg_apdu_verify() {
     return SW_WRONG_DATA;
   }
   
-  
-
-   //PINPAD
-  if (G_gpg_vstate.io_cla==0xFF) {
+  //PINPAD
+  if (G_gpg_vstate.io_cla == 0xEF) {
     if (gpg_pin_is_blocked(pin)) {
       THROW(SW_PIN_BLOCKED);
       return SW_PIN_BLOCKED;
@@ -220,25 +219,7 @@ int gpg_apdu_change_ref_data() {
   gpg_pin_set_verified(pin->ref,0);
   
   
-  // --- RC pin ---
-  if (pin->ref == PIN_ID_RC) {
-    newlen = G_gpg_vstate.io_length;
-    if (newlen == 0) {
-      gpg_nvm_write(pin, NULL, sizeof(gpg_pin_t));
-
-    }
-    else if ((newlen > GPG_MAX_PW_LENGTH) ||
-             (newlen < 8)) {
-        THROW(SW_WRONG_DATA);
-      return SW_WRONG_DATA;
-    } else {
-      gpg_pin_set(pin,
-                      G_gpg_vstate.work.io_buffer+G_gpg_vstate.io_offset,
-                      newlen);
-    }
-    gpg_io_discard(1);
-    return SW_OK;
-  }
+  
 
   // --- PW1/PW3 pin ---
   if (gpg_pin_is_blocked(pin)) {
diff --git a/src/gpg_ram.c b/src/gpg_ram.c
index eb07678..d536d5e 100644
--- a/src/gpg_ram.c
+++ b/src/gpg_ram.c
@@ -24,6 +24,7 @@
 #ifndef GPG_DEBUG_MAIN
 unsigned char G_io_seproxyhal_spi_buffer[IO_SEPROXYHAL_BUFFER_SIZE_B];
 ux_state_t ux;
+
 #else
 extern unsigned char G_io_seproxyhal_spi_buffer[IO_SEPROXYHAL_BUFFER_SIZE_B];
 int apdu_n;
diff --git a/src/gpg_select.c b/src/gpg_select.c
index d88f672..908f874 100644
--- a/src/gpg_select.c
+++ b/src/gpg_select.c
@@ -36,6 +36,9 @@ int gpg_apdu_select() {
     }
 
     gpg_io_discard(0);
+    if (N_gpg_pstate->histo[7] != 0x07) {
+      THROW(SW_STATE_TERMINATED);
+    }
     sw = SW_OK;
   } else {
     THROW(SW_FILE_NOT_FOUND);
diff --git a/src/gpg_types.h b/src/gpg_types.h
index 988d716..9b89fc8 100644
--- a/src/gpg_types.h
+++ b/src/gpg_types.h
@@ -179,6 +179,7 @@ struct gpg_v_state_s {
   unsigned char   seed_mode;
 
   /* io state*/
+
   unsigned char   io_cla;
   unsigned char   io_ins;
   unsigned char   io_p1;