Topic: elliptic curve division (Read 248 times)

yes i tested ecctools and python ecdsa lib and some other lib, and found mistakes in my scripts useing fastecds lib in python

i think this thread is useless, pls advice to MOD for delete this or archive it, for save others time to read and test uselss topic

I ran test, I get same answer as below using two different programs (other than fastecdsa):

i'm check this dividing with bitaddress.org and always one is even and one is odd uncopressed:
1/8 is: 0416F9A89D6DA61F39BDBD7AA1D99D6C4FE7D35C91AE777DF739678098DCDF2247C673D580E0A09 32D00BD9DDE2B44A738A240E3D5386EF35903E7A4E9886D522C
-1/8 is: 0416F9A89D6DA61F39BDBD7AA1D99D6C4FE7D35C91AE777DF739678098DCDF2247398C2A7F1F5F6 CD2FF426221D4BB58C75DBF1C2AC7910CA6FC185B157792AA03
ps.hi to all i'm new (special regards to COBRAS my english is worst than yours and i'm more would like break bitcoin than you )

tested all version of fastecdsa
were doubt if sub bug inside fastecdsa, but all ver says save 0216... 0216...

someone have other python or c scripts for div, can test and verify

as i mention math formula for div EC, at decimal result is different

just this


0200000000000000000000003b78ce563f89a0ed9414f5aa28ad0d96d6795f9c63
0300000000000000000000003b78ce563f89a0ed9414f5aa28ad0d96d6795f9c63

possible can be used

here is dec math for pubkeys when div 2 at dec levels

1
115792089237316195423570985008687907852837564279074904382605163141518161494336
0279be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798
0379be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798

half
57896044618658097711785492504343953926418782139537452191302581570759080747169
57896044618658097711785492504343953926418782139537452191302581570759080747168
0200000000000000000000003b78ce563f89a0ed9414f5aa28ad0d96d6795f9c63
0300000000000000000000003b78ce563f89a0ed9414f5aa28ad0d96d6795f9c63

half
86844066927987146567678238756515930889628173209306178286953872356138621120753
28948022309329048855892746252171976963209391069768726095651290785379540373584
02a6b594b38fb3e77c6edf78161fade2041f4e09fd8497db776e546c41567feb3c
03a6b594b38fb3e77c6edf78161fade2041f4e09fd8497db776e546c41567feb3c

half
101318078082651670995624611882601919371232868744190541334779517748828391307545
14474011154664524427946373126085988481604695534884363047825645392689770186792
0216f9a89d6da61f39bdbd7aa1d99d6c4fe7d35c91ae777df739678098dcdf2247
0316f9a89d6da61f39bdbd7aa1d99d6c4fe7d35c91ae777df739678098dcdf2247

------------

when half these in add/sub/mul scripts for elliptic curve division useing fastecdsa python modul

02a6b594b38fb3e77c6edf78161fade2041f4e09fd8497db776e546c41567feb3c
03a6b594b38fb3e77c6edf78161fade2041f4e09fd8497db776e546c41567feb3c
results are
0216f9a89d6da61f39bdbd7aa1d99d6c4fe7d35c91ae777df739678098dcdf2247
0216f9a89d6da61f39bdbd7aa1d99d6c4fe7d35c91ae777df739678098dcdf2247

actual should be 0216... and 0316...

ecdsa123's point is you did the math wrong, one will always be 02 and one will always be 03, when you get two equals you messed up the math.

02 03 is Y odd even, not X etc etc bull shit

sibstract is same as divide, and without float

Are you talking to me or to OP? It is worth mentioning that you can't use tags inside the code tag. e.g. ["b"].
Could you also clarify what is BS?

it is bulshit:)

You just multiplied and divided the same values which will always return as same, 1 and -1, do you think you could play my game now? What is the smallest public key and largest public key? And could we somehow organize them alpha numerically? That way you'll have a map to the entire public key database and then represent them with decimal even hexadecimal values. Mind blowing I know, maybe your username could be used as a reference to me.🤣

   

lets play new idea

dec 1 (1)
pubkey 0279be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798

dec -1 (FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFEBAAEDCE6AF48A03BBFD25E8CD0364140)
pubkey 0379be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798

both pubkey half

0200000000000000000000003b78ce563f89a0ed9414f5aa28ad0d96d6795f9c63
0300000000000000000000003b78ce563f89a0ed9414f5aa28ad0d96d6795f9c63

both pubkey half

02a6b594b38fb3e77c6edf78161fade2041f4e09fd8497db776e546c41567feb3c
03a6b594b38fb3e77c6edf78161fade2041f4e09fd8497db776e546c41567feb3c

both pubkey half

0216f9a89d6da61f39bdbd7aa1d99d6c4fe7d35c91ae777df739678098dcdf2247
0216f9a89d6da61f39bdbd7aa1d99d6c4fe7d35c91ae777df739678098dcdf2247

now Question
example when pubkey 02 is odd, 03 same x will be even

and last you see both same pubkey return even or odd, but one direction only....

but alternate if you 0216f9a89d6da61f39bdbd7aa1d99d6c4fe7d35c91ae777df739678098dcdf2247 * 2
result 02a6b594b38fb3e77c6edf78161fade2041f4e09fd8497db776e546c41567feb3c

03a6b594b38fb3e77c6edf78161fade2041f4e09fd8497db776e546c41567feb3c div 2
result 0216f9a89d6da61f39bdbd7aa1d99d6c4fe7d35c91ae777df739678098dcdf2247

so finally we learn, 02/03 same x have odd and even , they is no option 2 different pubkeys direction have 1 return point

share your knowledge ....