diff --git a/main_form.Designer.cs b/main_form.Designer.cs
index 4ccf18e..4f54587 100644
--- a/main_form.Designer.cs
+++ b/main_form.Designer.cs
@@ -28,7 +28,7 @@
         /// </summary>
         private void InitializeComponent()
         {
-            System.Windows.Forms.DataGridViewCellStyle dataGridViewCellStyle7 = new System.Windows.Forms.DataGridViewCellStyle();
+            System.Windows.Forms.DataGridViewCellStyle dataGridViewCellStyle9 = new System.Windows.Forms.DataGridViewCellStyle();
             this.textBox1 = new System.Windows.Forms.TextBox();
             this.textBox2 = new System.Windows.Forms.TextBox();
             this.label1 = new System.Windows.Forms.Label();
@@ -223,14 +223,14 @@
             this.dataGridView1.BorderStyle = System.Windows.Forms.BorderStyle.None;
             this.dataGridView1.ColumnHeadersHeightSizeMode = System.Windows.Forms.DataGridViewColumnHeadersHeightSizeMode.AutoSize;
             this.dataGridView1.ColumnHeadersVisible = false;
-            dataGridViewCellStyle7.Alignment = System.Windows.Forms.DataGridViewContentAlignment.MiddleCenter;
-            dataGridViewCellStyle7.BackColor = System.Drawing.SystemColors.Window;
-            dataGridViewCellStyle7.Font = new System.Drawing.Font("Verdana", 30F);
-            dataGridViewCellStyle7.ForeColor = System.Drawing.SystemColors.ControlText;
-            dataGridViewCellStyle7.SelectionBackColor = System.Drawing.SystemColors.Highlight;
-            dataGridViewCellStyle7.SelectionForeColor = System.Drawing.SystemColors.HighlightText;
-            dataGridViewCellStyle7.WrapMode = System.Windows.Forms.DataGridViewTriState.False;
-            this.dataGridView1.DefaultCellStyle = dataGridViewCellStyle7;
+            dataGridViewCellStyle9.Alignment = System.Windows.Forms.DataGridViewContentAlignment.MiddleCenter;
+            dataGridViewCellStyle9.BackColor = System.Drawing.SystemColors.Window;
+            dataGridViewCellStyle9.Font = new System.Drawing.Font("Verdana", 30F);
+            dataGridViewCellStyle9.ForeColor = System.Drawing.SystemColors.ControlText;
+            dataGridViewCellStyle9.SelectionBackColor = System.Drawing.SystemColors.Highlight;
+            dataGridViewCellStyle9.SelectionForeColor = System.Drawing.SystemColors.HighlightText;
+            dataGridViewCellStyle9.WrapMode = System.Windows.Forms.DataGridViewTriState.False;
+            this.dataGridView1.DefaultCellStyle = dataGridViewCellStyle9;
             this.dataGridView1.Location = new System.Drawing.Point(401, 88);
             this.dataGridView1.Name = "dataGridView1";
             this.dataGridView1.ReadOnly = true;
@@ -290,6 +290,7 @@
             this.button3.TabIndex = 507;
             this.button3.Text = "check key";
             this.button3.UseVisualStyleBackColor = true;
+            this.button3.Click += new System.EventHandler(this.button3_Click);
             // 
             // label11
             // 
@@ -333,6 +334,7 @@
             this.button4.TabIndex = 512;
             this.button4.Text = "decrypt";
             this.button4.UseVisualStyleBackColor = true;
+            this.button4.Click += new System.EventHandler(this.button4_Click);
             // 
             // label13
             // 
diff --git a/main_form.cs b/main_form.cs
index 2ea720e..377b77e 100644
--- a/main_form.cs
+++ b/main_form.cs
@@ -4,6 +4,7 @@ using System.ComponentModel;
 using System.Data;
 using System.Drawing;
 using System.Linq;
+using System.Security.Cryptography;
 using System.Text;
 using System.Text.RegularExpressions;
 using System.Threading.Tasks;
@@ -71,7 +72,7 @@ namespace KRY_0x01_ng
         }
 
 
-        bool check_key(TextBox tb_k)
+        bool check_key(TextBox tb_k, TextBox tb_pk, TextBox tb_na)
         {
             bool success = true;
             if (tb_k.Text.Length == 0)
@@ -100,8 +101,8 @@ namespace KRY_0x01_ng
                 return success = false;
             }
 
-            TextBox tb_pruned_k = textBox2;
-            TextBox tb_nualph = textBox3;
+            TextBox tb_pruned_k = tb_pk;
+            TextBox tb_nualph = tb_na;
             tb_pruned_k.Text = str_to_check;
             char[] transient_alph = alphabet.Except(str_to_check.ToArray()).ToArray();
             string transientalph_str = "";
@@ -167,6 +168,24 @@ namespace KRY_0x01_ng
             return;
         }
 
+        void check_cryptmessage(TextBox tb_m)
+        {
+            if (tb_m.Text.Length == 0)
+            {
+                MessageBox.Show("Empty message, nothing to do.", "Warning");
+                return;
+            }
+            string msg = tb_m.Text.ToUpper();
+            Match match = Regex.Match(msg, @"\d|\s+|W");
+            if (match.Success)
+            {
+                MessageBox.Show("Only alphabetic characters (with the exception of W) are allowed.\nCheck the cryptmessage for numbers, symbols or tab whitespace and remove them before continuing.", "Error");
+                return;
+            }
+            textBox9.Text = msg;
+            return;
+        }
+
         string msg_hack_up(string msg)
         {
             string digraph_msg = "";
@@ -207,7 +226,7 @@ namespace KRY_0x01_ng
 
         void encrypt()
         {
-            bool cool = check_key(textBox1);
+            bool cool = check_key(textBox1, textBox2, textBox3);
             if (!cool)
             {
                 return;
@@ -265,6 +284,19 @@ namespace KRY_0x01_ng
 
 
 
+        void decrypt()
+        {
+            bool cool = check_key(textBox8, textBox11, textBox10);
+            if (!cool)
+            {
+                return;
+            }
+            check_cryptmessage(textBox9);
+        }
+
+
+
+
         private void button1_Click(object sender, EventArgs e)
         {
             /* encrypt button */
@@ -274,12 +306,29 @@ namespace KRY_0x01_ng
         private void button2_Click(object sender, EventArgs e)
         {
             /* check key button */
-            bool cool = check_key(textBox1);
+            bool cool = check_key(textBox1, textBox2, textBox3);
             if (!cool)
             {
                 return;
             }
             fill_array_table();
         }
+
+        private void button3_Click(object sender, EventArgs e)
+        {
+            /* check decryption key*/
+            bool cool = check_key(textBox8, textBox11, textBox10);
+            if (!cool)
+            {
+                return;
+            }
+            fill_array_table();
+        }
+
+        private void button4_Click(object sender, EventArgs e)
+        {
+            /* decrypt */
+            decrypt();
+        }
     }
 }