diff --git a/README.md b/README.md
index 024cdd21e..ee2c02d79 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@ Decentralized websites using Bitcoin crypto and BitTorrent network
  - Fast and works offline: You can access the site even if your internet is gone.
 
 
-## How does it works?
+## How does it work?
  - After starting `zeronet.py` you will be able to visit zeronet sites using http://127.0.0.1:43110/{zeronet_address} (eg. http://127.0.0.1:43110/1EU1tbG9oC1A8jz2ouVwGZyQ5asrNsE4Vr).
  - When you visit a new zeronet site, it's trying to find peers using BitTorrent network and download the site files (html, css, js...) from them.
  - Each visited sites become also served by You.
diff --git a/src/Crypt/CryptHash.py b/src/Crypt/CryptHash.py
index e2d202a6f..57932acc0 100644
--- a/src/Crypt/CryptHash.py
+++ b/src/Crypt/CryptHash.py
@@ -9,10 +9,28 @@ def sha1sum(file, blocksize=65536):
 	return hash.hexdigest()
 
 
+def sha512sum(file, blocksize=65536):
+	if hasattr(file, "endswith"): # Its a string open it
+		file = open(file, "rb")
+	hash = hashlib.sha512()
+	for block in iter(lambda: file.read(blocksize), ""):
+		hash.update(block)
+	return hash.hexdigest()
+
+
 if __name__ == "__main__":
 	import cStringIO as StringIO
 	a = StringIO.StringIO()
 	a.write("hello!")
 	a.seek(0)
 	print hashlib.sha1("hello!").hexdigest()
-	print sha1sum(a)
\ No newline at end of file
+	print sha1sum(a)
+
+	import time
+	s = time.time()
+	print sha1sum(open("F:\\Temp\\bigfile")),
+	print time.time()-s
+
+	s = time.time()
+	print sha512sum(open("F:\\Temp\\bigfile")),
+	print time.time()-s
\ No newline at end of file
diff --git a/src/Ui/media/Loading.coffee b/src/Ui/media/Loading.coffee
index 359328fed..c42ed1df4 100644
--- a/src/Ui/media/Loading.coffee
+++ b/src/Ui/media/Loading.coffee
@@ -12,7 +12,7 @@ class Loading
 
 	# We dont need loadingscreen anymore
 	hideScreen: ->
-		if not $(".loadingscreen").hasClass("done") # Nothing to do, just let the animtion to be finished
+		if not $(".loadingscreen").hasClass("done") # Only if its not animating already
 			if @screen_visible # Hide with animate
 				$(".loadingscreen").addClass("done").removeLater(2000)
 			else # Not visible, just remove
diff --git a/src/lib/BitcoinECC/BitcoinECC.py b/src/lib/BitcoinECC/BitcoinECC.py
index 8ae7bea9d..6f4811328 100644
--- a/src/lib/BitcoinECC/BitcoinECC.py
+++ b/src/lib/BitcoinECC/BitcoinECC.py
@@ -235,7 +235,7 @@ def GeneratePrivateKey(self):
         #Of course, this function isn't cryptographically secure.
         #Don't use it to generate your key. Use a cryptographically secure source of randomness instead.
         #self.d = random.randint(1,self.n-1)
-        self.d = int(os.urandom(32).encode("hex"), 16) # Better random fix
+        self.d = random.SystemRandom().randint(1,self.n-1) # Better random fix
     
     def SignECDSA(self,m):
         #Sign a message. The private key is self.d .
@@ -246,7 +246,8 @@ def SignECDSA(self,m):
         r=0
         s=0
         while not r or not s:
-            k=random.randint(1,self.n-1)
+            #k=random.randint(1,self.n-1)
+            k=random.SystemRandom().randint(1,self.n-1) # Better random fix
             R=self*k
             R.Normalize()
             r=R.x[0]%self.n