diff --git a/module/mifare.cpp b/module/mifare.cpp
index de253ed..de6c5cc 100644
--- a/module/mifare.cpp
+++ b/module/mifare.cpp
@@ -108,18 +108,32 @@ void Mifare::sniff()
     ui->funcTab->setCurrentIndex(1);
 }
 
+void Mifare::snoop()
+{
+    util->execCMD("hf 14a snoop");
+    ui->funcTab->setCurrentIndex(1);
+}
+
 void Mifare::list()
 {
     util->execCMD("hf list mf");
     ui->funcTab->setCurrentIndex(1);
 }
 
-QString Mifare::_readblk(int blockId, KeyType keyType, QString& key, int waitTime)
+QString Mifare::_readblk(int blockId, KeyType keyType, const QString& key, int waitTime)
 {
     QString data;
     QString result;
+    bool isKeyBlock = (blockId < 128 && ((blockId + 1) % 4 == 0)) || ((blockId + 1) % 8 == 0);
+
+    if(!data_isKeyValid(key))
+    {
+        return "";
+    }
+
     if(util->getClientType() == Util::OFFICIAL)
     {
+        // use the given key type to read the target block
         result = util->execCMDWithOutput(
                      "hf mf rdbl "
                      + QString::number(blockId)
@@ -131,111 +145,106 @@ QString Mifare::_readblk(int blockId, KeyType keyType, QString& key, int waitTim
         if(result.indexOf("isOk:01") != -1)
         {
             result = result.mid(dataPattern->indexIn(result), 47).toUpper();
-            if((blockId < 128 && ((blockId + 1) % 4 == 0)) || ((blockId + 1) % 8 == 0)) // process key block
-            {
-                if(keyType == KEY_A)
-                {
-                    for(int i = 0; i < 6; i++)
-                    {
-                        result = result.replace(i * 3, 2, key.mid(i * 2, 2));
-                    }
-                    data = result;
-                    QString tmpKey = result.right(18).replace(" ", "");
-                    result = util->execCMDWithOutput(
-                                 "hf mf rdbl "
-                                 + QString::number(blockId)
-                                 + " B "
-                                 + tmpKey,
-                                 waitTime);
-                    if(result.indexOf("isOk:01") == -1)
-                    {
-                        result = data;
-                        result = result.replace(30, 17, "?? ?? ?? ?? ?? ??");
-                        data = result;
-                    }
-                }
-                else
-                {
-                    for(int i = 0; i < 6; i++)
-                    {
-                        result = result.replace(
-                                     30 + i * 3,
-                                     2,
-                                     key.mid(i * 2, 2));
-                    }
-                    result = result.replace(0, 18, "?? ?? ?? ?? ?? ?? ");
-                    data = result;
-                }
-            }
-            else
+
+            // when the target block is a key block and the given key type is keyA, try to check whether the keyB is valid
+            // if the given key type is keyB, it will never get the keyA from the key block
+            if(!isKeyBlock)
             {
                 data = result;
             }
-        }
-        else
-        {
-            data = "";
-        }
-        return data;
-    }
-}
-
-void Mifare::read()
-{
-    int waitTime = 300;
-    int currblk = ui->MF_RW_blockBox->currentText().toInt();
-    QString result = util->execCMDWithOutput(
-                         "hf mf rdbl "
-                         + QString::number(currblk)
-                         + " "
-                         + ui->MF_RW_keyTypeBox->currentText()
-                         + " "
-                         + ui->MF_RW_keyEdit->text(),
-                         waitTime);
-    if(result.indexOf("isOk:01") != -1)
-    {
-        result = result.mid(dataPattern->indexIn(result), 47).toUpper();
-        if((currblk < 128 && ((currblk + 1) % 4 == 0)) || ((currblk + 1) % 8 == 0)) // process key block
-        {
-            if(ui->MF_RW_keyTypeBox->currentText() == "A")
+            else if(isKeyBlock && keyType == KEY_A)
             {
                 for(int i = 0; i < 6; i++)
                 {
-                    result = result.replace(i * 3, 2, ui->MF_RW_keyEdit->text().mid(i * 2, 2));
+                    result = result.replace(i * 3, 2, key.mid(i * 2, 2));
                 }
-                ui->MF_RW_dataEdit->setText(result);
+                data = result;
                 QString tmpKey = result.right(18).replace(" ", "");
                 result = util->execCMDWithOutput(
                              "hf mf rdbl "
-                             + ui->MF_RW_keyTypeBox->currentText()
+                             + QString::number(blockId)
                              + " B "
                              + tmpKey,
                              waitTime);
                 if(result.indexOf("isOk:01") == -1)
                 {
-                    result = ui->MF_RW_dataEdit->text();
+                    result = data;
                     result = result.replace(30, 17, "?? ?? ?? ?? ?? ??");
-                    ui->MF_RW_dataEdit->setText(result);
+                    data = result;
                 }
             }
-            else
+            else if(isKeyBlock && keyType == KEY_B)
             {
-                for(int i = 0; i < 6; i++)
+                for(int i = 0; i < 6; i++) // use the given keyB to replace revelant part of block data
                 {
                     result = result.replace(
                                  30 + i * 3,
                                  2,
-                                 ui->MF_RW_keyEdit->text().mid(i * 2, 2));
+                                 key.mid(i * 2, 2));
                 }
-                result = result.replace(0, 18, "?? ?? ?? ?? ?? ?? ");
-                ui->MF_RW_dataEdit->setText(result);
+                result = result.replace(0, 18, "?? ?? ?? ?? ?? ?? "); // fill the keyA part with ?
+                data = result;
             }
         }
         else
         {
-            ui->MF_RW_dataEdit->setText(result);
+            data = "";
+        }
+    }
+    return data.remove(" ");
+}
+
+QStringList Mifare::_readsec(int sectorId, KeyType keyType, const QString& key, int waitTime)
+{
+    QStringList data;
+    QString result, tmp;
+    int offset = 0;
+
+    if(!data_isKeyValid(key))
+    {
+        return data;
+    }
+
+    if(util->getClientType() == Util::OFFICIAL)
+    {
+        result = util->execCMDWithOutput(
+                     "hf mf rdsc "
+                     + QString::number(sectorId)
+                     + " "
+                     + (char)keyType
+                     + " "
+                     + key,
+                     waitTime);
+        offset = result.indexOf("isOk:01");
+        if(offset != -1)
+        {
+            for(int i = 0; i < cardType.blk[sectorId]; i++)
+            {
+                offset = dataPattern->indexIn(result, offset);
+                tmp = result.mid(offset, 47).toUpper();
+                offset += 47;
+                qDebug() << tmp;
+                tmp.remove(" ");
+                data.append(tmp);
+            }
         }
     }
+    return data;
+}
+
+void Mifare::read()
+{
+    int blockId = ui->MF_RW_blockBox->currentText().toInt();
+    Mifare::KeyType keyType = (Mifare::KeyType)(ui->MF_RW_keyTypeBox->currentData().toInt());
+    QString result = _readblk(blockId, keyType, ui->MF_RW_keyEdit->text());
+    if(result != "")
+    {
+        ui->MF_RW_dataEdit->setText(result);
+    }
+    else
+    {
+        ui->MF_RW_dataEdit->setText(tr("Failed"));
+    }
 }
 
 void Mifare::readAll()
diff --git a/module/mifare.h b/module/mifare.h
index ddc4011..d68bf9c 100644
--- a/module/mifare.h
+++ b/module/mifare.h
@@ -22,6 +22,7 @@ public:
     void nested();
     void hardnested();
     void sniff();
+    void snoop();
     void list();
     void read();
     void readAll();
@@ -119,6 +120,9 @@ public:
     void loadSniff(const QString& file);
     void saveSniff(const QString& file);
     void data_fillKeys();
+
+    QString _readblk(int blockId, KeyType keyType, const QString &key, int waitTime = 300);
+    QStringList _readsec(int sectorId, KeyType keyType, const QString &key, int waitTime = 300);
 public slots:
 signals:
 
@@ -136,7 +140,8 @@ private:
     QRegExp* UIDPattern;
     QString bin2text(const QByteArray& buff, int start, int length);
 
-    QString _readblk(int blockId, KeyType keyType, QString &key, int waitTime);
+    //QString _readblk(int blockId, KeyType keyType, const QString &key, int waitTime = 300);
+    //QStringList _readsec(int sectorId, KeyType keyType, const QString &key, int waitTime = 300);
 };
 
 #endif // MIFARE_H
diff --git a/ui/mainwindow.cpp b/ui/mainwindow.cpp
index 4464ca8..4919334 100644
--- a/ui/mainwindow.cpp
+++ b/ui/mainwindow.cpp
@@ -202,25 +202,25 @@ void MainWindow::MF_onTypeChanged(int id, bool st)
     typeBtnGroup->blockSignals(false);
 }
 
-void MainWindow::on_MF_checkAllBox_stateChanged(int arg1)
+void MainWindow::on_MF_selectAllBox_stateChanged(int arg1)
 {
     ui->MF_dataWidget->blockSignals(true);
-    ui->MF_checkAllBox->blockSignals(true);
+    ui->MF_selectAllBox->blockSignals(true);
     if(arg1 == Qt::PartiallyChecked)
     {
-        ui->MF_checkAllBox->setTristate(false);
-        ui->MF_checkAllBox->setCheckState(Qt::Checked);
+        ui->MF_selectAllBox->setTristate(false);
+        ui->MF_selectAllBox->setCheckState(Qt::Checked);
     }
     for(int i = 0; i < mifare->cardType.blocks; i++)
     {
-        ui->MF_dataWidget->item(i, 1)->setCheckState(ui->MF_checkAllBox->checkState());
+        ui->MF_dataWidget->item(i, 1)->setCheckState(ui->MF_selectAllBox->checkState());
     }
     for(int i = 0; i < mifare->cardType.sectors; i++)
     {
-        ui->MF_dataWidget->item(mifare->cardType.blks[i], 0)->setCheckState(ui->MF_checkAllBox->checkState());
+        ui->MF_dataWidget->item(mifare->cardType.blks[i], 0)->setCheckState(ui->MF_selectAllBox->checkState());
     }
     ui->MF_dataWidget->blockSignals(false);
-    ui->MF_checkAllBox->blockSignals(false);
+    ui->MF_selectAllBox->blockSignals(false);
 }
 
 void MainWindow::on_MF_data2KeyButton_clicked()
@@ -253,7 +253,7 @@ void MainWindow::on_MF_fontButton_clicked()
 void MainWindow::on_MF_dataWidget_itemChanged(QTableWidgetItem *item)
 {
     ui->MF_dataWidget->blockSignals(true);
-    ui->MF_checkAllBox->blockSignals(true);
+    ui->MF_selectAllBox->blockSignals(true);
     if(item->column() == 0)
     {
         int selectedSectors = 0;
@@ -271,15 +271,15 @@ void MainWindow::on_MF_dataWidget_itemChanged(QTableWidgetItem *item)
         }
         if(selectedSectors == 0)
         {
-            ui->MF_checkAllBox->setCheckState(Qt::Unchecked);
+            ui->MF_selectAllBox->setCheckState(Qt::Unchecked);
         }
         else if(selectedSectors == mifare->cardType.sectors)
         {
-            ui->MF_checkAllBox->setCheckState(Qt::Checked);
+            ui->MF_selectAllBox->setCheckState(Qt::Checked);
         }
         else
         {
-            ui->MF_checkAllBox->setCheckState(Qt::PartiallyChecked);
+            ui->MF_selectAllBox->setCheckState(Qt::PartiallyChecked);
         }
     }
     else if(item->column() == 1)
@@ -303,15 +303,15 @@ void MainWindow::on_MF_dataWidget_itemChanged(QTableWidgetItem *item)
         }
         if(selectedBlocks == 0)
         {
-            ui->MF_checkAllBox->setCheckState(Qt::Unchecked);
+            ui->MF_selectAllBox->setCheckState(Qt::Unchecked);
         }
         else if(selectedBlocks == mifare->cardType.blocks)
         {
-            ui->MF_checkAllBox->setCheckState(Qt::Checked);
+            ui->MF_selectAllBox->setCheckState(Qt::Checked);
         }
         else
         {
-            ui->MF_checkAllBox->setCheckState(Qt::PartiallyChecked);
+            ui->MF_selectAllBox->setCheckState(Qt::PartiallyChecked);
         }
         if(selectedSubBlocks == 0)
         {
@@ -340,7 +340,7 @@ void MainWindow::on_MF_dataWidget_itemChanged(QTableWidgetItem *item)
         mifare->data_syncWithDataWidget(false, item->row());
     }
     ui->MF_dataWidget->blockSignals(false);
-    ui->MF_checkAllBox->blockSignals(false);
+    ui->MF_selectAllBox->blockSignals(false);
 }
 
 void MainWindow::on_MF_keyWidget_itemChanged(QTableWidgetItem *item)
@@ -659,6 +659,13 @@ void MainWindow::on_MF_Sniff_sniffButton_clicked()
     setState(true);
 }
 
+void MainWindow::on_MF_Sniff_snoopButton_clicked()
+{
+    setState(false);
+    mifare->snoop();
+    setState(true);
+}
+
 void MainWindow::on_MF_Sniff_listButton_clicked()
 {
     mifare->list();
@@ -673,7 +680,7 @@ void MainWindow::MF_widgetReset()
     ui->MF_dataWidget->setRowCount(blks);
 
     ui->MF_dataWidget->blockSignals(true);
-    ui->MF_checkAllBox->blockSignals(true);
+    ui->MF_selectAllBox->blockSignals(true);
 
     for(int i = 0; i < blks; i++)
     {
@@ -692,10 +699,10 @@ void MainWindow::MF_widgetReset()
         setTableItem(ui->MF_dataWidget, mifare->cardType.blks[i], 0, QString::number(i));
         ui->MF_dataWidget->item(mifare->cardType.blks[i], 0)->setCheckState(Qt::Checked);
     }
-    ui->MF_checkAllBox->setCheckState(Qt::Checked);
+    ui->MF_selectAllBox->setCheckState(Qt::Checked);
 
     ui->MF_dataWidget->blockSignals(false);
-    ui->MF_checkAllBox->blockSignals(false);
+    ui->MF_selectAllBox->blockSignals(false);
 }
 // ************************************************
 
@@ -767,7 +774,8 @@ void MainWindow::uiInit()
     }
     settings->endGroup();
 
-
+    ui->MF_RW_keyTypeBox->addItem("A", Mifare::KEY_A);
+    ui->MF_RW_keyTypeBox->addItem("B", Mifare::KEY_B);
 
     on_Raw_CMDHistoryBox_stateChanged(Qt::Unchecked);
     on_PM3_refreshPortButton_clicked();
@@ -889,3 +897,10 @@ void MainWindow::on_GroupBox_clicked(bool checked)
 }
 
 // ***********************************************
+
+
+
+void MainWindow::on_testButton_clicked()
+{
+    mifare->_readsec(0, Mifare::KEY_A, "FFFFFFFFFFFF");
+}
diff --git a/ui/mainwindow.h b/ui/mainwindow.h
index 37d89b1..f3337b6 100644
--- a/ui/mainwindow.h
+++ b/ui/mainwindow.h
@@ -137,10 +137,14 @@ private slots:
 
     void on_GroupBox_clicked(bool checked);
 
-    void on_MF_checkAllBox_stateChanged(int arg1);
+    void on_MF_selectAllBox_stateChanged(int arg1);
 
     void on_MF_fillKeysButton_clicked();
 
+    void on_MF_Sniff_snoopButton_clicked();
+
+    void on_testButton_clicked();
+
 private:
     Ui::MainWindow* ui;
     QButtonGroup* typeBtnGroup;
diff --git a/ui/mainwindow.ui b/ui/mainwindow.ui
index d678bdb..a32006c 100644
--- a/ui/mainwindow.ui
+++ b/ui/mainwindow.ui
@@ -183,9 +183,9 @@
              </spacer>
             </item>
             <item>
-             <widget class="QCheckBox" name="MF_checkAllBox">
+             <widget class="QCheckBox" name="MF_selectAllBox">
               <property name="text">
-               <string>Check All</string>
+               <string>Select All</string>
               </property>
               <property name="tristate">
                <bool>false</bool>
@@ -564,16 +564,6 @@
                    <height>16777215</height>
                   </size>
                  </property>
-                 <item>
-                  <property name="text">
-                   <string>A</string>
-                  </property>
-                 </item>
-                 <item>
-                  <property name="text">
-                   <string>B</string>
-                  </property>
-                 </item>
                 </widget>
                </item>
                <item>
@@ -585,6 +575,13 @@
                </item>
               </layout>
              </item>
+             <item>
+              <widget class="QPushButton" name="testButton">
+               <property name="text">
+                <string>test</string>
+               </property>
+              </widget>
+             </item>
              <item>
               <spacer name="horizontalSpacer_3">
                <property name="orientation">
@@ -827,6 +824,12 @@
              </item>
              <item>
               <widget class="QPushButton" name="MF_Sim_writeAllButton">
+               <property name="minimumSize">
+                <size>
+                 <width>40</width>
+                 <height>0</height>
+                </size>
+               </property>
                <property name="text">
                 <string>Read All</string>
                </property>
@@ -847,6 +850,12 @@
              </item>
              <item>
               <widget class="QPushButton" name="MF_Sim_simButton">
+               <property name="minimumSize">
+                <size>
+                 <width>40</width>
+                 <height>0</height>
+                </size>
+               </property>
                <property name="text">
                 <string>Simulate</string>
                </property>
@@ -909,10 +918,29 @@
                </property>
               </widget>
              </item>
+             <item>
+              <widget class="QPushButton" name="MF_Sniff_snoopButton">
+               <property name="minimumSize">
+                <size>
+                 <width>40</width>
+                 <height>0</height>
+                </size>
+               </property>
+               <property name="text">
+                <string>Snoop</string>
+               </property>
+              </widget>
+             </item>
              <item>
               <widget class="QPushButton" name="MF_Sniff_listButton">
+               <property name="minimumSize">
+                <size>
+                 <width>40</width>
+                 <height>0</height>
+                </size>
+               </property>
                <property name="text">
-                <string>List Sniff Data</string>
+                <string>List Data</string>
                </property>
               </widget>
              </item>