/sci/ - Science & Math » Thread #13790020

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one way math

Anonymous Mon 25 Oct 22:04:02 2021 No.13790020 View Reply Original Report

Quoted By: >>13790038 >>13790058 >>13790068 >>13790212 >>13790551 >>13790586

is there any simple form of One-way function?
a way to get a result but be impossible to go back and find the numbers used?

Anonymous

Anonymous Mon 25 Oct 2021 22:12:46 No.13790038 Report

Quoted By:

f(x)=
>>13790020
>is there any simple form of One-way function?
>a way to get a result but be impossible to go back and find the numbers used?
f(x)=6

Anonymous

Anonymous Mon 25 Oct 2021 22:26:08 No.13790056 Report

Quoted By:

take a function f
take a random number a
f(x+a)

Anonymous

Anonymous Mon 25 Oct 2021 22:28:16 No.13790058 Report

Quoted By:

>>13790020
f(x) = x * 0

Anonymous

Anonymous Mon 25 Oct 2021 22:32:07 No.13790068 Report

Quoted By:

>>13790020
f(x) = x mod y
where y is any natural number

Anonymous

Anonymous Mon 25 Oct 2021 23:25:06 No.13790181 Report

Quoted By: >>13790245

$f(x)=sin x$

Anonymous

Anonymous Mon 25 Oct 2021 23:28:09 No.13790187 Report

Quoted By:

f(x) is any non monotonic function

Anonymous

Anonymous Mon 25 Oct 2021 23:33:10 No.13790199 Report

Quoted By:

If there exist points on the graph of f(x), whose y coordinates are the same, then you cannot get the value of x by knowing the value of the function

Anonymous

Anonymous Mon 25 Oct 2021 23:36:39 No.13790212 Report

Quoted By:

>>13790020
>is there any simple form of One-way function?
yeah, it's called a function that isn't a injection

Anonymous

Anonymous Mon 25 Oct 2021 23:42:19 No.13790234 Report

Quoted By:

Maybe OP is thinking of things being difficult to reverse like multiplying large primes or point operations on an elliptic curve over a prime field

Anonymous

Anonymous Mon 25 Oct 2021 23:47:21 No.13790245 Report

Quoted By: >>13790251

>>13790181
f(x) = asin (sinx)

Anonymous

Anonymous Mon 25 Oct 2021 23:50:20 No.13790251 Report

Quoted By:

>>13790245
asin would only give back x for a tiny interval of x(from -pi/2 to pi/2)
the graph of sin x repeats itself infinitely, so its impossible to know the exact value of x

El Arcón

El Arcón Tue 26 Oct 2021 00:02:17 No.13790266 Report

Quoted By: >>13790285 >>13790588

f : R -> [-1,1]
f(x) = sin(x)

Anonymous

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Anonymous Tue 26 Oct 2021 00:15:04 No.13790285 Report

Quoted By: >>13790596

>>13790266
YO JOHNNY, NICE GOAL YOU SCORED, BETTER NOT FUCK UP NEXT GAME

Anonymous

Anonymous Tue 26 Oct 2021 01:54:58 No.13790551 Report

Quoted By:

>>13790020
check out elliptic curve cryptography

Anonymous

Anonymous Tue 26 Oct 2021 02:07:28 No.13790586 Report

Quoted By:

>>13790020
https://en.wikipedia.org/wiki/One-way_compression_function
yes, this is used a lot for web security

Anonymous

Anonymous Tue 26 Oct 2021 02:08:29 No.13790588 Report

Quoted By:

>>13790266
also
f: R -> R
f(x) = a, a \in R

Anonymous

Anonymous Tue 26 Oct 2021 02:12:06 No.13790596 Report

Quoted By:

>>13790285
Jesus Christ how is it so luscious everywhere else and so bald where it’s not. Were you exposed to radiation or something?

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