UInt32 id = Util.GetInputMasterOrSlaveID(deviceID);
BS2ErrorCode result = BS2ErrorCode.BS_SDK_SUCCESS;

if (id == deviceID)     // set key to master
{
	BS2OsdpStandardDeviceSecurityKey keyInfo = Util.AllocateStructure<BS2OsdpStandardDeviceSecurityKey>();

	Util.HighlightLine(">>>> Please enter the OSDP security key.", "security key");
	Console.Write(">>>> ");
	string keyString = Console.ReadLine();
	byte[] buff = Encoding.UTF8.GetBytes(keyString);

	Array.Clear(keyInfo.key, 0, BS2Environment.BS2_OSDP_STANDARD_KEY_SIZE);
	Array.Copy(buff, 0, keyInfo.key, 0, keyString.Length);

	IntPtr ptrKey = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(BS2OsdpStandardDeviceSecurityKey)));
	Marshal.StructureToPtr(keyInfo, ptrKey, false);

	result = (BS2ErrorCode)API.BS2_SetOsdpStandardDeviceSecurityKey(sdkContext, id, ptrKey);

	Marshal.FreeHGlobal(ptrKey);
}
else
{
	result = (BS2ErrorCode)API.BS2_SetOsdpStandardDeviceSecurityKey(sdkContext, id, IntPtr.Zero);
}

if (result != BS2ErrorCode.BS_SDK_SUCCESS)
	Console.WriteLine("Got error({0}).", result);
else
	Console.WriteLine("Call success.");

return result;