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+
+
+<img src='./PDPS.png' height=75% width=75% >
+
+
+
+```python
+from nacl.public import Box, PrivateKey, PublicKey
+from nacl.signing import SigningKey, SignedMessage
+
+from nacl.encoding import HexEncoder
+from ecdsa import ellipticcurve, curves, util, numbertheory
+import ecdsa as pyecdsa
+import hashlib
+import binascii
+from binascii import unhexlify
+import ecdsa as pyecdsa
+from ecdsa.ellipticcurve import INFINITY
+
+#SECP256k1 = pyecdsa.curves.find_curve((1, 3, 132, 0, 10))
+SECP256k1 = pyecdsa.curves.find_curve((1, 3, 132, 0, 10))
+```
+
+
+```python
+
+
+class Point(ellipticcurve.Point):
+    def __init__(self, *args, **kwargs):
+        kwargs.setdefault('order', SECP256k1.order)
+        super(Point, self).__init__(SECP256k1.curve, *args, **kwargs)
+
+    def __neg__(self):
+      return Point( self.x(), -self.y())
+   
+    def __sub__(self, Q):
+        a=self + -Q
+        return Point(a.x(),a.y())
+
+    
+```
+
+
+```python
+priv_key= PrivateKey.generate()
+signing_key=pyecdsa.SigningKey.generate( curve=SECP256k1)
+
+```
+
+
+```python
+#range for statistical zero-knowledge property.
+R=2**256 * 2**256 * 2**80
+B=16# 2**256
+K =16# 2**256
+```
+
+
+```python
+def long_to_bytes (val, endianness='big'):
+
+    # one (1) hex digit per four (4) bits
+    width = val.bit_length()
+
+    # unhexlify wants an even multiple of eight (8) bits, but we don't
+    # want more digits than we need (hence the ternary-ish 'or')
+    width += 8 - ((width % 8) or 8)
+
+    # format width specifier: four (4) bits per hex digit
+    fmt = '%%0%dx' % (width // 4)
+
+    # prepend zero (0) to the width, to zero-pad the output
+    s = unhexlify(fmt % val)
+
+    if endianness == 'little':
+        # see http://stackoverflow.com/a/931095/309233
+        s = s[::-1]
+
+    return s
+
+```
+
+
+```python
+class Client(object):
+    def __init__(O,key=None):
+        if not key:
+            O.k = signing_key=pyecdsa.SigningKey.generate( curve=SECP256k1)      
+        else :
+            O.k = key
+    def file_process(O,path="./slice.1_8.fec"):
+        f="A"*32#open(path).read()
+        D=util.string_to_number(f)
+        b=util.string_to_number(O.k.to_string())
+  
+        s=D%b
+        n=D//b
+
+        D_1=(n * b) + s
+        r = long_to_bytes(rr)
+    
+        print hashlib.sha1(f).hexdigest()
+        print hashlib.sha1(r).hexdigest()
+    
+        
+        b_id =  SECP256k1.generator  * n
+        ro1= SECP256k1.generator  * n
+        ro2 = SECP256k1.generator  * s
+            #private, public
+        return ((n,b,s), (b_id, ro1,ro2))
+        
+    def generate_challenge1(O):
+        return util.randrange(R)
+    
+    
+    
+```
+
+
+```python
+class server(object):
+    def __init__(O, b_id, ro1,ro2): 
+        O.ro1=ro1
+        O.ro2=ro1
+        O.file_pub=b_id
+        
+    def commitment(O, challenge):
+        f="A"*32#open("./slice.1_8.fec").read()
+        a=util.string_to_number(f)
+        
+        O.b=challenge
+        O.z=a%b
+        O.m=a//b
+        O.r =  util.randrange(B**2)
+        O.t = util.randrange(B**2)
+        O.x1 = SECP256k1.generator * r
+        O.x2 = SECP256k1.generator * t
+    
+        return ((O.x1,O.x2),(O.m,O.z,O.r,O.t))
+    
+```
+
+
+```python
+c=Client()
+#s=server()
+#priv_c,pub_c=c.file_process()
+
+```
+
+
+```python
+def preprocessing():
+    f=open("./slice.1_8.fec").read()
+    D=util.string_to_number(f)
+    b=util.string_to_number(signing_key.to_string())
+
+    s=D%b
+    n=D//b
+
+    D_1=(n * b) + s
+    #r = long_to_bytes(rr)
+    
+    print hashlib.sha1(f).hexdigest()
+    #print hashlib.sha1(r).hexdigest()
+    
+        
+    b_id =  SECP256k1.generator  * n
+    ro1= SECP256k1.generator  * n
+    ro2 = SECP256k1.generator  * s
+    
+    return ((n,b,s), (b_id, ro1,ro2))
+
+
+def generate_challenge(n,b,s):
+    
+    b_id =  SECP256k1.generator  * n
+    ro1= SECP256k1.generator  * n
+    ro2 = SECP256k1.generator  * s
+    
+    return (b_id, ro1,ro2)
+
+
+client_secret_priv, public_element = preprocessing()
+
+
+
+
+```
+
+    73ea3b5e061b6cabed623d1f0f8ba0e2dd7a8ef4
+
+
+   <img src='./algo_keys.png' height=25% width=50%>
+
+
+```python
+import ecdsa as pyecdsa
+
+SECP256k1 = pyecdsa.curves.find_curve((1, 3, 132, 0, 10))
+SECP256k1 = pyecdsa.curves.find_curve((1, 3, 132, 0, 10))
+
+def generate_priv_challenge():
+    f=open("./slice.1_8.fec").read()
+    blockid= hashlib.sha256(signing_key.sign(f)).hexdigest()
+    a=util.string_to_number(f)
+    b=util.string_to_number(signing_key.to_string())#encode())
+    s=a%b
+    n=a//b
+    ro1= SECP256k1.generator  * n
+    ro2 = SECP256k1.generator  * s
+    
+    return (blockid, ro1,ro2,n,s)
+    
+```
+
+
+```python
+block_id,ro1,ro2,n,s = generate_priv_challenge()
+```
+
+<img src='./challenge.png' heigth=75% width=75%>
+
+
+```python
+def remote_commitment(chall):
+    f=open("./slice.1_8.fec").read()
+    a=util.string_to_number(f)
+    b=chall
+    z=a%b
+    m=a//b
+    print z
+    r =  util.randrange(B*B)
+    t = util.randrange(B*B)
+    #w= r^z
+    #print w
+    x1 = r * SECP256k1.generator 
+    x2 = t * SECP256k1.generator 
+    
+    return ((x1,x2),(m,z,r,t))
+    
+    
+```
+
+
+```python
+chall = util.randrange(R)
+
+(commit,ch_resp)=commitment(chall)
+
+```
+
+
+```python
+chall2 = util.randrange(K)
+```
+
+
+```python
+def remote_resp(c, resp):
+    m=resp[0]  
+    z=resp[1]  
+    r=resp[2]
+    t=resp[3]
+    
+    y1= r+(c*z)
+    y2= t+(c*m)
+    
+    return y1,y2
+```
+
+
+```python
+y1,y2 = host_resp(chall2, ch_resp) 
+```
+
+
+```python
+chall = util.randrange(R)
+chall2 = util.randrange(K)
+
+P = SECP256k1.generator
+
+
+(commit,ch_resp)=remote_commitment(chall)
+y1,y2 = remote_resp(chall2, ch_resp) 
+x1=commit[0]
+x2=commit[1]
+
+b_ = chall
+c = chall2
+
+z =  ch_resp[1]
+m = ch_resp[0]
+```
+
+    383769705759922238814820635125091393536751781330499963960027267106043604344928356482304970868177244815080981113707959740583852333897030317262689421782904643950974779849213407220
+
+
+<img src='./proof1.png'>
+
+
+```python
+as1_1= ( y1 * P ) + (-Point(x1.x(),x1.y()))#y1.P-x1
+as1_2= ( c * z  ) *  P #cz.P
+print "assert I", as1_1==as1_2
+print as1_1.x()
+print as1_2.x()
+as2_1=( y2 * P ) + ( -Point(x2.x(),x2.y()) )
+as2_2= (b_* m )  * P
+print "assert II", as2_1==as2_2
+print as2_1.x()
+print as2_2.x()
+```
+
+    assert I True
+    5876730895232555975670752555686052848272136747449052900777052125475456965293
+    5876730895232555975670752555686052848272136747449052900777052125475456965293
+    assert II False
+    95958819438731652205001323648120835610712117261911186719618043262918945418931
+    55940851260522358385586042305550878175039129341223631825528624425777497241555
+
+
+
+```python
+as2_1=(y2 * P) + (-Point(x2.x(),x2.y()))
+as2_2= (b_*m) * P
+print as2_1.x()
+print as2_2.x()
+
+```
+
+    91728786092928355630891141238137171644308836139219436085412195700189316134122
+    107279711877694500410709767952754959809170673439664368886384200698769658470714
+
+
+
+<img src='./equality.png'>
+
+
+```python
+SK=b=util.string_to_number(signing_key.to_string())
+chall*SK * ro1 - chall2 * (y2 * SECP256k1.generator + - Point(commit[0].x(),commit[0].y())
+```
+
+
+
+
+    <ecdsa.ellipticcurve.Point at 0x106e16f50>
+
+
+
+
+```python
+%qtconsole
+```
+
+
+```python
+x1=commit[0]
+Y1=y1*SECP256k1.generator
+Y1=Point(Y1.x(),Y1.y())
+RO1=chall2*Point(ro1.x(),ro1.y())
+X1=Point(x1.x(),x1.y())
+RO1=Point(RO1.x(),RO1.y())
+
+assertion1 = Y1-X1-RO1
+```
+
+
+```python
+ro1.y()
+```
+
+
+```python
+sk=util.string_to_number(signing_key.to_string())
+
+curv=SECP256k1.curve
+
+#chall2*sk*ro2 - b*(y2.Gen-x2)
+tb1=chall2*sk*ro2
+
+x2=commit[1]
+#x2=Point(x2.x(),x2.y())
+Y2=SECP256k1.generator * y2
+Y2=Point(Y2.x(),Y2.y())
+X2=Point(x2.x(),x2.y())
+XY2=Y2-X2
+XY2 = - chall * XY2
+
+assertion2 = tb1 + XY2
+#Y3=Point(Y2.x(),Y2.y())
+
+#chall*(Y2-x2)
+#tb2 = chall*((SECP256k1.generator * y2) + invx2)
+#Z2=Point(tb2.x(),-tb2.y())
+
+#assertion2=tb1+Z2
+
+
+#chall
+```
+
+
+```python
+print assertion1==assertion2
+print assertion1.x() 
+print assertion2.x()
+#Point(t1.x(),- t1.y())-Point(t1.x(),t1.y())
+```
+
+    False
+    7736584874372799755670583036719701680498164259870020736174578513076009517175
+    26299729680235291815366724209282966839464132792531995892755583725140232542577
+
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