Post
Topic
Board Development & Technical Discussion
Re: Determine if a public key point y is negative or positive, odd or even?
by
AlexanderCurl
on 17/01/2025, 17:39:30 UTC
can you write something more about these calculation methods

The most SIMPLE ONE for example.

Search Range: 2^24 .. 2^25
Sequence Length : 24
Total Bruteforce steps : 16777216 sqrt(16777216) = 4096
Steps taken : 34578
Value2 hit : 031aedeb569c5312c4a3370fca49be76f6f0ae1d3fb04dd68b037c151a0ae799f4 Odd Point
Combo sum: 16592754
Combo : (8388608, 4194304, 2097152, 1048576, 524288, 262144, 65536, 8192, 2048, 1024, 512, 256, 64, 32, 16, 2)
Combo Length : 16
Private Key : 33185509
Time taken : 1.68 sec

range 2^10...2^11 (1024...2048)
scalars used for demonstration
point(1955) ODD
1955 / 2 = 977,5  977,5 - 0,5 = 977
value1 = 977,5
value2 = 977
using powerOfTwoValues combos
512+256+128+64+16+1=977
value2 hit point 1955 is ODD we know that before knowing scalar of it.
since we know sum of combo 977 that point is ODD
977 + 0,5 = 977,5
977,5 * 2 = 1955

point(1786) EVEN
1786 / 2 = 893  893 - 0,5 = 892,5
value1 = 893
value2 = 892,5
using powerOfTwoValues combos
512+256+64+32+16+8+4+1=893
value1 hit point 1786 is EVEN we know that before knowing scalar of it.
since we know sum of combo 893 and that point is EVEN
893 * 2 = 1786