diff --git a/module/mifare.cpp b/module/mifare.cpp
index 68edee3..5bd6ddd 100644
--- a/module/mifare.cpp
+++ b/module/mifare.cpp
@@ -603,7 +603,7 @@ bool Mifare::data_loadDataFile(const QString& filename)
     if(file.open(QIODevice::ReadOnly))
     {
         QByteArray buff;
-        buff = file.read(8192);
+        buff = file.read(10000);
         bool isBin = false;
         for(int i = 0; i < cardType.blocks * 16; i++) // Detect the file type
         {
@@ -620,19 +620,11 @@ bool Mifare::data_loadDataFile(const QString& filename)
         }
         if(isBin)
         {
-            char LByte, RByte;
-            char map[16] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
+            if(file.size() < cardType.blocks * 16)
+                return false;
             for(int i = 0; i < cardType.blocks; i++)
             {
-                QString tmp = "";
-                for(int j = 0; j < 16; j++)
-                {
-                    LByte = map[(unsigned char)buff[i * 16 + j] >> 4];
-                    RByte = map[(unsigned char)buff[i * 16 + j] & 0xF];
-                    tmp += LByte;
-                    tmp += RByte;
-                }
-                qDebug() << tmp;
+                QString tmp = bin2text(buff, i, 16);
                 dataList->replace(i, tmp.toUpper());
             }
         }
@@ -662,23 +654,23 @@ bool Mifare::data_loadKeyFile(const QString& filename)
     if(file.open(QIODevice::ReadOnly))
     {
         QByteArray buff;
-        buff = file.read(960);
-        bool isBin = true;
-        if(isBin)
+        buff = file.read(10000);
+        bool isKey = file.size() <= cardType.sectors * 14;
+        if(isKey)
         {
-            char LByte, RByte;
-            char map[16] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
             for(int i = 0; i < cardType.sectors; i++)
             {
-                QString tmp = "";
-                for(int j = 0; j < 12; j++)
-                {
-                    LByte = map[(unsigned char)buff[i * 12 + j] >> 4];
-                    RByte = map[(unsigned char)buff[i * 12 + j] & 0xF];
-                    tmp += LByte;
-                    tmp += RByte;
-                }
-                qDebug() << tmp;
+                QString tmp = bin2text(buff, i, 12);
+                keyAList->replace(i, tmp.left(12).toUpper());
+                keyBList->replace(i, tmp.right(12).toUpper());
+            }
+        }
+        else
+        {
+            for(int i = 0; i < cardType.sectors; i++)
+            {
+                int blk = cardType.blks[i] + cardType.blk[i] - 1;
+                QString tmp = bin2text(buff, blk, 16);
                 keyAList->replace(i, tmp.left(12).toUpper());
                 keyBList->replace(i, tmp.right(12).toUpper());
             }
@@ -693,6 +685,22 @@ bool Mifare::data_loadKeyFile(const QString& filename)
     }
 }
 
+QString Mifare::bin2text(const QByteArray& buff, int i, int length)
+{
+    QString ret = "";
+    char LByte, RByte;
+    char map[16] = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F'};
+    for(int j = 0; j < length; j++)
+    {
+        LByte = map[(unsigned char)buff[i * length + j] >> 4];
+        RByte = map[(unsigned char)buff[i * length + j] & 0xF];
+        ret += LByte;
+        ret += RByte;
+    }
+    qDebug() << ret;
+    return ret;
+}
+
 bool Mifare::data_saveDataFile(const QString& filename, bool isBin)
 {
     QFile file(filename, this);
diff --git a/module/mifare.h b/module/mifare.h
index 0205a84..8f31ead 100644
--- a/module/mifare.h
+++ b/module/mifare.h
@@ -120,6 +120,7 @@ private:
     QRegExp* chkKeyPattern;
     QRegExp* nestedKeyPattern;
     QRegExp* UIDPattern;
+    QString bin2text(const QByteArray &buff, int start, int length);
 };
 
 #endif // MIFARE_H
diff --git a/ui/mainwindow.cpp b/ui/mainwindow.cpp
index ab6aecb..3fdf3f2 100644
--- a/ui/mainwindow.cpp
+++ b/ui/mainwindow.cpp
@@ -274,7 +274,7 @@ void MainWindow::on_MF_File_loadButton_clicked()
     else if(ui->MF_File_keyBox->isChecked())
     {
         title = tr("Plz select the key file:");
-        filename = QFileDialog::getOpenFileName(this, title, "./", tr("Binary Key Files(*.bin *.dump);;All Files(*.*)"));
+        filename = QFileDialog::getOpenFileName(this, title, "./", tr("Binary Key Files(*.bin *.dump);;Binary Data Files(*.bin *.dump);;All Files(*.*)"));
         qDebug() << filename;
         if(filename != "")
         {