All Questions
12
questions
1
vote
0
answers
58
views
Why assertion error in Point addition?
I am doing my research on SECP256k1 but now i am facing assertion error sometimes.
I can't seem to find where it comes from, so i once thought its because the resulting point is point at affinity.
So ...
0
votes
1
answer
160
views
How to convert the results of point doubling (Rx1 and Ry1) to point addition (Rx2 and Ry2) without knowledge of (Qx, Qy) in secp256k1 elliptic curve [closed]
I'm working with the secp256k1 elliptic curve and have point doubling and point addition formulas for this curve. Given the following formulas:
Point Addition Formula in Python3:
s = (Qy - Gy) * pow(...
-2
votes
1
answer
64
views
I have upgraded libsecp256k1 to latest master but I'm having issues to link it properly now. How can I resolve this?
I have upgraded libsecp256k1 to the latest master but I'm having issues to link it properly now. What is the problem and how might I resolve it?
The error message is:
collect2: error: ld returned 1 ...
- 15.6k
1
vote
1
answer
145
views
How to add multihreading to a continuous SECP256K1 Python function?
I have an infinite loop Python function for measuring how fast are SECP256K1 public Keys are generated.
The script:
from time import time
a = 0
b = 7
n = ...
- 35
4
votes
1
answer
202
views
How does the BIP340 lift_x algorithm work?
Couple questions of code that I'm reviewing trying to learn schnorr sigs.
Why do we want an odd private key? I see even tests on the private key and then subtract it from the SECP256K1 Order to get an ...
- 331
2
votes
1
answer
376
views
Why bitcoin's generator point does not satisfy Elliptic Curve Cryptography equation?
This is my Python program:
Acurve = 0
Bcurve = 7
Gx = 0x79BE667EF9DCBBAC55A06295CE870B07029BFCDB2DCE28D959F2815B16F81798
Gy = 0x483ADA7726A3C4655DA4FBFC0E1108A8FD17B448A68554199C47D08FFB10D4B8
print(...
1
vote
0
answers
45
views
Incorrectly counts the we have added a generator point to itself in a loop (SECP256K1, Python),
I have a script that converts a bitcoin private key into x and y coordinate with parameters of a Secp256k1 curve. Here's the script:
a = 0
b = 7
#Order of the finite field
prime = 2**256 - 2**32 - 977
...
- 35
1
vote
1
answer
1k
views
How to convert a compressed public key into uncompressed one in Python?
I've searched really hard for a Python script that coverts a compressed public key into uncompressed one, since I don't know how to code this.
I stumbled upon these links:
https://stackoverflow.com/...
- 77
2
votes
1
answer
138
views
Fail at coding my private to public key converter (Pyhon)
Fail at coding my private to public key converter script for Bitcoin (Secp256k1)
Currently going through the book "Programming Bitcoin by Jimmy Song", got stuck on page 61 (Chapter 3), but ...
- 77
4
votes
1
answer
329
views
How to verify a lnurl-auth callback with python
I want to create a Python implementation of an lnurl-auth server.
I started a quick HTTP server to be the callback url, and captured the signed callback sent by BLW on Android.
?tag=login
&k1=...
1
vote
1
answer
1k
views
Is there a Python or SageMath implementation for solving the ECDL problem for small secret multiplier?
I am looking for a Python script or SageMath code implementation for testing the Baby Step - Giant Stepand Pollard Rhoalgorithms on the secp256k1 curve.
I have read that these algorithms are well ...
- 351
1
vote
1
answer
882
views
Question about Python library coincurve/libsecp256k
I am a noob with cryptography, just trying to learn using python and the library Coincurve ( https://github.com/ofek/coincurve ) which is a mature Python binding for libsecp256k1.
The following code ...
- 11