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F.<x> = GF(2)[]

K. = GF(2**163, name='a', modulus=x^163 + x^7 + x^6 + x^3 +1 )

F.<x> = GF(2)[]

K.<a> = GF(2**163, name='a', modulus=x^163 + x^7 + x^6 + x^3 +1 )

b = 0x000000020A601907B8C953CA1481EB10512F78744A3205FD

b1 = F(b.digits(2))

xx1 = 0x00000003F0EBA16286A2D57EA0991168D4994637E8343E36

yy1 = 0x00000000D51FBC6C71A0094FA2CDD545B11C5C0C797324F1

xx2 = F(xx1.digits(2))

yy2 = F(yy1.digits(2))

E = EllipticCurve(K,[1,1,0,0,b1])

punto = E([xx2,yy2])

punto.order()

When i try to find the order I got this error!

Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "_sage_input_17.py", line 10, in <module>
    exec compile(u'open("___code___.py","w").write("# -*- coding: utf-8 -*-\\n" + _support_.preparse_worksheet_cell(base64.b64decode("cHVudG8ub3JkZXIoKQ=="),globals())+"\\n"); execfile(os.path.abspath("___code___.py"))
  File "", line 1, in <module>

  File "/tmp/tmpLBskY6/___code___.py", line 2, in <module>
    exec compile(u'punto.order()
  File "", line 1, in <module>

  File "/sagenb/sage_install/sage-5.4-sage.math.washington.edu-x86_64-Linux/local/lib/python2.7/site-packages/sage/schemes/elliptic_curves/ell_point.py", line 3295, in order
    N = generic.order_from_bounds(self,bounds,operation='+')
  File "/sagenb/sage_install/sage-5.4-sage.math.washington.edu-x86_64-Linux/local/lib/python2.7/site-packages/sage/groups/generic.py", line 1405, in order_from_bounds
m = d * bsgs(Q, identity, bounds, operation=operation)
File "/sagenb/sage_install/sage-5.4-sage.math.washington.edu-x86_64-Linux/local/lib/python2.7/site-packages/sage/groups/generic.py", line 475, in bsgs
for i0 in misc.srange(m):
  File "/sagenb/sage_install/sage-5.4-sage.math.washington.edu-x86_64-Linux/local/lib/python2.7/site-packages/sage/misc/misc.py", line 1185, in srange
return ZZ.range(start, end, step)
  File "integer_ring.pyx", line 456, in sage.rings.integer_ring.IntegerRing_class.range (sage/rings/integer_ring.c:6534)
RuntimeError: Segmentation fault