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Is it feasible to calculate EC private key k from public key K for very low values of k?

Yes you could start creating a database of private/public keys but that wouldn’t get you anywhere, there is not enough storage in the world to ever store any significant portion of the key space. To ...
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How to calculate the public key, compute point P and create signature using ECDSA?

The double and add method uses each number's binary representation to perform the computation. Taking a big-endian representation of a number, from left to right, if the n-th bit is 1, then you double ...
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How can i achieve this signature?

You can achieve this with The secp256k1 calculator. Click on the Sig function from the menu in the middle. Enter 0x1000 for the h,k, and private key ...
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