diff --git a/firmware/basic/xxtea.c b/firmware/basic/xxtea.c
index d126793..c59e3f4 100644
--- a/firmware/basic/xxtea.c
+++ b/firmware/basic/xxtea.c
@@ -9,16 +9,35 @@
  */
 
 #include <stdint.h>
+#include "xxtea.h"
+
+uint32_t htonl(uint32_t v)
+{
+    uint32_t r;
+    r |= (v>> 0)&0xFF; r<<=8;
+    r |= (v>> 8)&0xFF; r<<=8;
+    r |= (v>>16)&0xFF; r<<=8;
+    r |= (v>>24)&0xFF;
+    return r;
+}
+
+void htonlp(uint32_t *v, uint8_t n)
+{
+    while(n--){
+        v[n] = htonl(v[n]);
+    }
+}
 
 #define DELTA 0x9e3779b9
 #define MX (((z>>5^y<<2) + (y>>3^z<<4)) ^ ((sum^y) + (k[(p&3)^e] ^ z)))
-#include "xxtea.h"
 
 void xxtea_encode_words(uint32_t *v, int n, uint32_t const k[4])
 {
     if(k[0] == 0 && k[1] == 0 && k[2] == 0 && k[3] == 0) return;
     uint32_t y, z, sum;
     unsigned p, rounds, e;
+
+    htonlp(v ,n);
     rounds = 6 + 52/n;
     sum = 0;
     z = v[n-1];
@@ -32,6 +51,7 @@ void xxtea_encode_words(uint32_t *v, int n, uint32_t const k[4])
         y = v[0];
         z = v[n-1] += MX;
     } while (--rounds);
+    htonlp(v ,n);
 }
 
 void xxtea_decode_words(uint32_t *v, int n, uint32_t const k[4])
@@ -39,6 +59,7 @@ void xxtea_decode_words(uint32_t *v, int n, uint32_t const k[4])
     if(k[0] == 0 && k[1] == 0 && k[2] == 0 && k[3] == 0) return;
     uint32_t y, z, sum;
     unsigned p, rounds, e;
+    htonlp(v ,n);
 
     rounds = 6 + 52/n;
     sum = rounds*DELTA;
@@ -52,5 +73,6 @@ void xxtea_decode_words(uint32_t *v, int n, uint32_t const k[4])
         z = v[n-1];
         y = v[0] -= MX;
     } while ((sum -= DELTA) != 0);
+    htonlp(v ,n);
 }
 
diff --git a/firmware/funk/openbeacon.c b/firmware/funk/openbeacon.c
index 7cebfec..835d89d 100644
--- a/firmware/funk/openbeacon.c
+++ b/firmware/funk/openbeacon.c
@@ -5,8 +5,9 @@
 #include "sysdefs.h"
 #include "filesystem/ff.h"
 
-const uint32_t key[4] = {0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF};
-const uint8_t useencryption = 0;
+//const uint32_t key[4] = {0xFFFF, 0xFFFF, 0xFFFF, 0xFFFF};
+const uint32_t key[4] = { 0xB4595344,0xD3E119B6,0xA814D0EC,0xEFF5A24E };
+const uint8_t useencryption = 1;
 const uint8_t mac[5] = {1,2,3,2,1};
 
 uint32_t oid = 0;
@@ -70,7 +71,7 @@ uint8_t openbeaconSendPacket(uint32_t id, uint32_t seq,
     buf[12]=0xff; // salt (0xffff always?)
     buf[13]=0xff;
 
-    return nrf_snd_pkt_crc_encr(32,buf,useencryption?key:NULL);
+    return nrf_snd_pkt_crc_encr(16,buf,useencryption?key:NULL);
 }
 
 uint8_t openbeaconSend(void)