diff --git a/src/app/definition.h b/src/app/definition.h
index 6b66e5f..851522b 100644
--- a/src/app/definition.h
+++ b/src/app/definition.h
@@ -35,10 +35,24 @@ typedef enum {  GPIO_0 = 0,
 #define STA_CFG_FILE "/CONFIG/STA.CFG"
 #define SCREEN_CFG_FILE "/CONFIG/SCREEN.CFG"
 #define SERVER_CFG_FILE "/CONFIG/SERVER.CFG"
+#define OTA_CFG_FILE "/CONFIG/OTA.CFG"
 #define WWW_DIR "/WWW"
 #define LOG_DIR "/LOGS"
 #define FTP_DIR "/FTP"
 
+//OTA public key for binary verification
+const char otaVerificationPubKey[] PROGMEM = R"DEL(
+-----BEGIN PUBLIC KEY-----
+MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAsh6eFU0pdfir5CsQqs0v
+vi7ip7MtRuNgcMtjl7lpXwQuMG5yoso1iR+Fzbz+Cso4lcqarG5uHV8nKYWQ+C39
++3OfKx9LSfabCnRAeFFhXuGWEfRcZ9aeW3Jv0Mg2+3sTOfXQGjdgNwOAqZNrL4kr
+574F+c3o/PAwlr4VLMy7KygorNnaYzC5JF1H5DhqaKNniKVEqGXiVQKW10C04SsM
+mGV/rKRSPpBVzyBrIf8GNPyVf7W4D0s9gSiCrRWMU2aU3tX35tezwlicsb86MKKM
+o9ySHAMsIihx3zdwAGOELxE47Ylodq9cwc53fz7pfcdyL+N6FKKWM0bYJAkwNhdJ
+NQIDAQAB
+-----END PUBLIC KEY-----
+)DEL";
+
 typedef enum { OR_0 = 2, OR_90 = 3, OR_180 = 0, OR_270 = 1 } Orientation;
 
 typedef enum { BIT = 0, BYTE, KBIT, KBYTE, MBIT, MBYTE, GBIT, GBYTE } SizeUnit;