How to remove screen lock for android 4.3 via Recovery Mode:
1. Flashing third-party recovery (must support adb communications, eg: CWM)
2. Enter Recovery mode.
3. Click "Scan"
4. Check "Unlock via recovery mode" option and then click "Unlock"
5. Unlock done, enjoy it!

Tips:
1. Flashing the third party recovery file, may lost the warranty;
2. if not necessary you can remove screen lock as: backup userdata > factory reset > Restore backups.

Keywords: Samsung, Android 4.3, Remove Screen Lock, Phone Lock, Pattern Lock, PIN Lock, Password Lock.