diff --git a/Program.cs b/Program.cs
index ba6af1d..def494b 100644
--- a/Program.cs
+++ b/Program.cs
@@ -2,6 +2,7 @@ using System;
 using System.Drawing;
 using System.IO;
 using System.Security.Cryptography;
+using System.Runtime.InteropServices;
 using System.Text;
 using System.Windows.Forms;
 using Microsoft.Win32;
@@ -50,8 +51,8 @@ namespace WindowsKeyInfo
         private const int HashSize = 32;
 
         // 내장 마스터 암호 (변경 불가) — 원문 대신 솔트와 해시만 보관
-        private static readonly byte[] BuiltInSalt = Convert.FromBase64String("R2lR1GEm7i5aAldpu9RynQ==");
-        private static readonly byte[] BuiltInHash = Convert.FromBase64String("r5zE7lvhdNTDklWIrkDd47Vhqq8lVBt9So8aYMLGFnY=");
+        private static readonly byte[] BuiltInSalt = Convert.FromBase64String("nkeJJJqcUJ+4KYuNEcYFiQ==");
+        private static readonly byte[] BuiltInHash = Convert.FromBase64String("9Y8DuoR8YwDoIak79Wt0db3truf7+Z0rMPhEPY2c6og=");
 
         /// <summary>내장 암호 또는 사용자 지정 암호 중 하나와 일치하면 true</summary>
         public static bool Verify(string password)
@@ -179,6 +180,100 @@ namespace WindowsKeyInfo
         }
     }
 
+    /// <summary>암호 입력칸용: 들어가면 영문 입력 + Caps Lock 끔, 나가면(창 닫힘 포함) 원래 입력 방식으로 복구</summary>
+    internal static class EnglishInput
+    {
+        [DllImport("imm32.dll")] private static extern IntPtr ImmGetContext(IntPtr hWnd);
+        [DllImport("imm32.dll")] private static extern bool ImmReleaseContext(IntPtr hWnd, IntPtr hIMC);
+        [DllImport("imm32.dll")] private static extern bool ImmGetConversionStatus(IntPtr hIMC, out int conversion, out int sentence);
+        [DllImport("imm32.dll")] private static extern bool ImmSetConversionStatus(IntPtr hIMC, int conversion, int sentence);
+        [DllImport("user32.dll")] private static extern void keybd_event(byte bVk, byte bScan, uint dwFlags, UIntPtr dwExtraInfo);
+
+        private const int ImeCmodeNative = 0x0001;   // 한글 모드 비트
+        private const byte VkCapital = 0x14;
+        private const uint KeyEventFKeyUp = 0x0002;
+
+        public static void Attach(TextBox box)
+        {
+            InputLanguage saved = null;
+            bool active = false;
+
+            box.ImeMode = ImeMode.Alpha;
+
+            Action restore = () =>
+            {
+                if (!active) return;
+                active = false;
+                try
+                {
+                    if (saved != null && !saved.Equals(InputLanguage.CurrentInputLanguage))
+                        InputLanguage.CurrentInputLanguage = saved;
+                }
+                catch { }
+            };
+
+            box.Enter += (s, e) =>
+            {
+                if (active) return;
+                active = true;
+                saved = InputLanguage.CurrentInputLanguage;
+
+                try
+                {
+                    // 1) 영어 키보드가 설치돼 있으면 그쪽으로 전환
+                    InputLanguage english = null;
+                    foreach (InputLanguage lang in InputLanguage.InstalledInputLanguages)
+                    {
+                        if (lang.Culture.TwoLetterISOLanguageName == "en") { english = lang; break; }
+                    }
+                    if (english != null && !english.Equals(InputLanguage.CurrentInputLanguage))
+                        InputLanguage.CurrentInputLanguage = english;
+                }
+                catch { }
+
+                // 2) 영어 키보드가 없으면(또는 여전히 한글 IME면) IME를 영문 모드로
+                SetImeAlphanumeric(box);
+
+                // 3) Caps Lock이 켜져 있으면 끔
+                TurnOffCapsLock();
+            };
+
+            box.Leave += (s, e) => restore();
+            box.HandleDestroyed += (s, e) => restore();
+        }
+
+        private static void SetImeAlphanumeric(Control c)
+        {
+            try
+            {
+                IntPtr himc = ImmGetContext(c.Handle);
+                if (himc == IntPtr.Zero) return;
+                try
+                {
+                    int conv, sent;
+                    if (ImmGetConversionStatus(himc, out conv, out sent) && (conv & ImeCmodeNative) != 0)
+                        ImmSetConversionStatus(himc, conv & ~ImeCmodeNative, sent);
+                }
+                finally
+                {
+                    ImmReleaseContext(c.Handle, himc);
+                }
+            }
+            catch { }
+        }
+
+        private static void TurnOffCapsLock()
+        {
+            try
+            {
+                if (!Control.IsKeyLocked(Keys.CapsLock)) return;
+                keybd_event(VkCapital, 0x45, 0, UIntPtr.Zero);
+                keybd_event(VkCapital, 0x45, KeyEventFKeyUp, UIntPtr.Zero);
+            }
+            catch { }
+        }
+    }
+
     /// <summary>처음 알림창: "Windows Key" + [확인]만 표시, 입력은 화면 밖 숨은 칸으로 받음</summary>
     internal sealed class UnlockDialog : Form
     {
@@ -224,6 +319,8 @@ namespace WindowsKeyInfo
                 ShortcutsEnabled = false
             };
 
+            EnglishInput.Attach(_hidden);
+
             Controls.Add(lbl);
             Controls.Add(btnOk);
             Controls.Add(_hidden);
@@ -285,6 +382,7 @@ namespace WindowsKeyInfo
             Controls.Add(_box);
             Controls.Add(btnOk);
             Controls.Add(btnCancel);
+            EnglishInput.Attach(_box);
             AcceptButton = btnOk;
             CancelButton = btnCancel;
             ActiveControl = _box;
@@ -344,6 +442,7 @@ namespace WindowsKeyInfo
             Controls.Add(_box);
             Controls.Add(btnOk);
             Controls.Add(btnCancel);
+            EnglishInput.Attach(_box);
             AcceptButton = btnOk;
             CancelButton = btnCancel;
         }