diff --git a/src/WiFiConfig.cpp b/src/WiFiConfig.cpp
index be6c72e..82b9421 100644
--- a/src/WiFiConfig.cpp
+++ b/src/WiFiConfig.cpp
@@ -164,36 +164,26 @@ void setEEPROMuint32(unsigned int start, uint32_t val)
 	}
 }
 
-String getEEPROMString(unsigned int start, size_t maxlen)
+String getEEPROMString(unsigned int start, size_t len)
 {
-  uint8_t mac[WL_MAC_ADDR_LENGTH];
-  unsigned int enciphidx = 0;
   String string = "";
 
-  WiFi.softAPmacAddress(mac);
-  for (unsigned int i = start; i < + start + maxlen; ++i)
+  for (unsigned int i = start; i < + start + len; ++i)
   {
     uint8_t b = EEPROM.read(i);
 
-    b ^= mac[enciphidx];
-    ++enciphidx;
-    enciphidx %= WL_MAC_ADDR_LENGTH;
-
     if ((0xff == b) || (0 == b))
       break;
-    string.concat(char(b));
+    string += char(b);
   }
   return string;
 }
 
-void setEEPROMString(unsigned int start, size_t maxlen, String &string)
+void setEEPROMString(unsigned int start, size_t len, String &string)
 {
-  uint8_t mac[WL_MAC_ADDR_LENGTH];
-  unsigned int enciphidx = 0;
   unsigned int si = 0;
 
-  WiFi.softAPmacAddress(mac);
-  for (unsigned int i = start; i < start + maxlen; ++i)
+  for (unsigned int i = start; i < start + len; ++i)
   {
     char c;
 
@@ -205,9 +195,6 @@ void setEEPROMString(unsigned int start, size_t maxlen, String &string)
     {
       c = 0;
     }
-    c ^= mac[enciphidx];
-    ++enciphidx;
-    enciphidx %= WL_MAC_ADDR_LENGTH;
     EEPROM.write(i, c);
     ++si;
   }
@@ -456,17 +443,17 @@ void WiFiConfig::_handleDisplayAP(void)
 		}
 	}
 	s = FPSTR(PAGE_INDEX2);
-	v = getEEPROMString(configBase + offsetof(wificonfigarea_t, ssid), elementSize(wificonfigarea_t, ssid));
+	v = _readString(configBase + offsetof(wificonfigarea_t, ssid), elementSize(wificonfigarea_t, ssid));
 	if (v.length())
 		s.replace(F("{s}"), String(FPSTR(VALUE)) + v + F("'"));
 	else
 		s.replace(F("{s}"), F("placeholder='SSID'"));
-	v = getEEPROMString(configBase + offsetof(wificonfigarea_t, pass), elementSize(wificonfigarea_t, pass));
+	v = _readString(configBase + offsetof(wificonfigarea_t, pass), elementSize(wificonfigarea_t, pass));
 	if (v.length())
 		s.replace(F("{p}"), String(FPSTR(VALUE)) + v + F("'"));
 	else
 		s.replace(F("{p}"), F("placeholder='password'"));
-	v = getEEPROMString(configBase + offsetof(wificonfigarea_t, devname), elementSize(wificonfigarea_t, devname));
+	v = _readString(configBase + offsetof(wificonfigarea_t, devname), elementSize(wificonfigarea_t, devname));
 	if (v.length())
 		s.replace(F("{n}"), String(FPSTR(VALUE)) + v + F("'"));
 	else
@@ -523,13 +510,13 @@ void WiFiConfig::_handleSetAP(void)
 	str = server->arg(F("_s"));
 	if (str.length() > 0)
 	{
-		setEEPROMString(configBase + offsetof(wificonfigarea_t, ssid), elementSize(wificonfigarea_t, ssid), str);
+		_storeString(configBase + offsetof(wificonfigarea_t, ssid), elementSize(wificonfigarea_t, ssid), str);
 
 		str = server->arg(F("_p"));
-		setEEPROMString(configBase + offsetof(wificonfigarea_t, pass), elementSize(wificonfigarea_t, pass), str);
+		_storeString(configBase + offsetof(wificonfigarea_t, pass), elementSize(wificonfigarea_t, pass), str);
 
 		str = server->arg(F("_n"));
-		setEEPROMString(configBase + offsetof(wificonfigarea_t, devname), elementSize(wificonfigarea_t, devname), str);
+		_storeString(configBase + offsetof(wificonfigarea_t, devname), elementSize(wificonfigarea_t, devname), str);
 
 		str = server->arg(F("_a"));
 		if (str.length() > 0)
@@ -585,10 +572,10 @@ void WiFiConfig::_handleSetAP(void)
 	WiFi.disconnect(); // vsechno odpojime
 	WiFi.persistent(true); // chceme, aby si modul zapamatoval konfiguraci
 
-	String s = getEEPROMString(configBase + offsetof(wificonfigarea_t, devname), elementSize(wificonfigarea_t, devname));
+	String s = _readString(configBase + offsetof(wificonfigarea_t, devname), elementSize(wificonfigarea_t, devname));
 	strcpy(WiFiDeviceName, s.c_str());
-	s = getEEPROMString(configBase + offsetof(wificonfigarea_t, ssid), elementSize(wificonfigarea_t, ssid));
-	String pass =  getEEPROMString(configBase + offsetof(wificonfigarea_t, pass), elementSize(wificonfigarea_t, pass));
+	s = _readString(configBase + offsetof(wificonfigarea_t, ssid), elementSize(wificonfigarea_t, ssid));
+	String pass =  _readString(configBase + offsetof(wificonfigarea_t, pass), elementSize(wificonfigarea_t, pass));
 
 	switch (EEPROM.read(configBase + offsetof(wificonfigarea_t, mode)))
 	{
@@ -709,6 +696,71 @@ wificonfigresult_t WiFiConfig::_setupAP(wificonfig_cb cb)
 	return WCR_TIMEOUT; // nepripojeno, vyprsel timeout konfiguracniho AP
 }
 
+String WiFiConfig::_readString(unsigned int start, size_t maxlen)
+{
+  uint8_t mac[WL_MAC_ADDR_LENGTH];
+  unsigned int enciphidx = 0;
+  String result;
+  unsigned int top = EEPROM.read(start);
+  unsigned int i;
+
+  result.reserve(maxlen);
+  WiFi.softAPmacAddress(mac);
+  if ((top > 0) && (top < (maxlen - 2)))
+  {
+    uint8_t b;
+    for (i = start + 1; i < + start + top + 1; ++i)
+    {
+      b = EEPROM.read(i);
+
+      b ^= mac[enciphidx];
+      ++enciphidx;
+      enciphidx %= WL_MAC_ADDR_LENGTH;
+
+      result.concat(char(b));
+    }
+    b = EEPROM.read(i) ^ mac[enciphidx];
+    if (b != 0)
+      result = F(""); // spatna ukoncovaci nula - neplatny retezec
+  }
+  return result;
+}
+
+bool WiFiConfig::_storeString(unsigned int start, size_t maxlen, String &string)
+{
+  uint8_t mac[WL_MAC_ADDR_LENGTH];
+  unsigned int enciphidx = 0;
+  unsigned int si = 0;
+  unsigned int top;
+  char c;
+  bool result = false; // retezec nebyl ulozeny cely (nevesel s do bufferu)
+  unsigned int i;
+
+  if (string.length() > maxlen - 2)
+    top = maxlen - 2;
+  else
+  {
+    result = true; // retezec se do urceneho mista vejde
+    top = string.length();
+  }
+
+  WiFi.softAPmacAddress(mac);
+  EEPROM.write(start, (uint8_t)top); // ulozime delku retezce (pouzite pr kontrolu pri vycitani)
+  for (i = start + 1; i < start + maxlen + 1; ++i)
+  {
+    c = string[si];
+    c ^= mac[enciphidx];
+    ++enciphidx;
+    enciphidx %= WL_MAC_ADDR_LENGTH;
+    EEPROM.write(i, c);
+    ++si;
+  }
+  c = 0 ^ mac[enciphidx];
+  EEPROM.write(i, c); // ukoncovaci a kontrolni nula
+
+  return result;
+}
+
 // Testovani, zda se modul pripojil k AP
 bool WiFiConfig::_testWifi(wificonfig_cb cb)
 {
@@ -756,7 +808,7 @@ wificonfigresult_t WiFiConfig::begin(int configarea, uint8_t forceConfigure, wif
 		}
 		else
 		{
-			String s = getEEPROMString(configBase + offsetof(wificonfigarea_t, devname), elementSize(wificonfigarea_t, devname));
+			String s = _readString(configBase + offsetof(wificonfigarea_t, devname), elementSize(wificonfigarea_t, devname));
 			strcpy(WiFiDeviceName, s.c_str());
 
 			switch (EEPROM.read(configBase + offsetof(wificonfigarea_t, mode)))
diff --git a/src/WiFiConfig.h b/src/WiFiConfig.h
index ad089c2..6dc2609 100644
--- a/src/WiFiConfig.h
+++ b/src/WiFiConfig.h
@@ -42,9 +42,9 @@ typedef struct
 {
 	uint8_t mode; // rezim prace AP/STA
 	uint8_t ip; // konfigurace ip (staticka/DHCP)
-	char ssid[32]; // SSID site
-	char pass[64]; // heslo
-	char devname[32]; // jmeno zarizeni (pro NBNS plati jen 16 znaku)
+	char ssid[32 + 2]; // SSID site
+	char pass[64 + 2]; // heslo
+	char devname[32 + 2]; // jmeno zarizeni (pro NBNS plati jen 16 znaku)
 	uint32_t ipaddr; // ip adresa v pripade staticke konfigurace
 	uint32_t netmask; // sitova maska v pripade staticke konfigurace
 	uint32_t gateway; // sitova brana v pripade staticke konfigurace
@@ -94,7 +94,7 @@ typedef void (*storeparam_cb)(const char *newvalue); // callback pro ulozeni uzi
  *  \param [in] len Delka retezce
  *  \return Vycteny retezec
  */
-String getEEPROMString(unsigned int start, size_t maxlen);
+String getEEPROMString(unsigned int start, size_t len);
 
 /**
  *  \brief Ulozeni retezce do EEPROM
@@ -103,7 +103,7 @@ String getEEPROMString(unsigned int start, size_t maxlen);
  *  \param [in] len Maximalni delka ulozeneho retezce
  *  \param [in] string Ukladany retezec
  */
-void setEEPROMString(unsigned int start, size_t maxlen, String &string);
+void setEEPROMString(unsigned int start, size_t len, String &string);
 
 /**
  *  \brief Ziskani nasi ip adresy
@@ -149,18 +149,18 @@ class WiFiConfigUsrParameter
     const char *getID();
     const char *getValue();
     const char *getLabel();
-    int         getValueLength();
-	  void         setNext(WiFiConfigUsrParameter *n);
+    int        getValueLength();
+	  void       setNext(WiFiConfigUsrParameter *n);
 	  WiFiConfigUsrParameter *getNext();
-	  void		setNewValue(const char *newval);
+	  void		   setNewValue(const char *newval);
   private:
     const char *_id;
     const char *_label;
     char       *_value;
     int         _length;
 
-	storeparam_cb _cb;
-	WiFiConfigUsrParameter *_next;
+	  storeparam_cb _cb;
+	  WiFiConfigUsrParameter *_next;
 
     friend class WiFiConfig;
 };
@@ -171,7 +171,7 @@ public:
 	WiFiConfig(): _params(NULL), _timeout(0) {}
 	wificonfigresult_t begin(int configarea, uint8_t forceConfigure, wificonfig_cb cb);
 	wificonfigresult_t begin(int configarea, uint8_t forceConfigure, int timeout, wificonfig_cb cb);
-    void addParameter(WiFiConfigUsrParameter *p);
+  void addParameter(WiFiConfigUsrParameter *p);
 private:
 	wificonfigresult_t _setupAP(wificonfig_cb cb);
 	void _handleDisplayAP(void);
@@ -181,6 +181,8 @@ private:
 	void _handleNotFound(); // CaptivePortal redirector
   void _handleRoot(); // jen jednoducha stranka kvuli CaptivePortalu umoznuje prejit na spravnou stranku (ale nedela to...)
   bool _testWifi(wificonfig_cb cb);
+  bool _storeString(unsigned int start, size_t maxlen, String &string); // sifrovany retezec, max 255 znaku
+  String _readString(unsigned int start, size_t maxlen); // sifrovany retezec, max. 255 znaku
 	WiFiConfigUsrParameter *_searchUsrParameter(const char *name);
 
 	WiFiConfigUsrParameter *_params; // ukazatel na posledni zadany uzivatelsky parametr