babycrypto4
Crypto
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Our side-channel attack about ECDSA was quite successful.
We could capture the first 16-bit of the nonces, which is the first half of them.
Now find out the encryption key.
The victim is using the secp160r1 curve.
The following is the captured data: r, s, k, and hash respectively.
Flag is LINECTF{} and encryption key is cosists of hex value. And case is insensitive.
Sorry, curve is secp160r1.
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