Top dweets by u/tomxor

function u(t) {

c.width=1920 // clear the canvas
for(i=0;i<9;i++)
x.fillRect(400+i*100+S(t)*300,400,50,200) // draw 50x200 rects

} // 122/140

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    u(t) is called 60 times per second.
    t: Elapsed time in seconds.
    S: Shorthand for Math.sin.
    C: Shorthand for Math.cos.
    T: Shorthand for Math.tan.
    R: Function that generates rgba-strings, usage ex.: R(255, 255, 255, 0.5)
    c: A 1920x1080 canvas.
    x: A 2D context for that canvas.

Try the new frontend: beta.dwitter.net
Current theme challenge: #Opposites

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tomxor

function u(t) {

for(c.width=128,t/=2,i=1e4;i--;)x.fillRect(i&127,i>>7,1,(i**3>>t)/(6+t**2/1e7)&1)

Mar 13 2020 2:12 AM UTC

}// 81/140

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tomxor

remix of d/17716 by u/ElisionFR

function u(t) {

c.width|=0;x.font='99px m'
c.style.cursor='none'
onmousemove=e=>R=e
x.fillText('🐁',R.x*3.4,R.y*3.4)

Feb 23 2020 2:29 PM UTC

}// 99/140

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Mouse Position

u/tomxor

#mouse
u/KilledByAPixel

another way to do it is c.width=innerWidth, then the mouse pos will match up exactly

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tomxor

remix of d/15387 by u/taupelink

function u(t) {

g=(a,b)=>b?g(b,a%b):a;f=()=>(X=t?X:1,X^=X<<13,X^=X>>17)%1e7|0;t||(m=n=0);n++;g(f(),f())-1||m++;x.fillRect(n%1920,1080*(1-m/n),1,1);throw m/n

Aug 13 2019 9:44 AM UTC

}// 140/140

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Deterministic version using 2/3 of an XORSHIFT seeded with 1.

u/taupelink

Cool!

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tomxor

remix of d/21369 by u/tomxor

function u(t) {

f=(a=0,b=0)=>S((d=9+Math.hypot(X+a-128,Y+b-64))/t)/d*12
for(c.width&=i=37120;i--;)
x.fillRect(X=i&255,Y=i>>8,Z=C(f(-8)+f()+f(8)+f(0,-32)),Z)

Jan 21 2021 9:59 PM UTC

}// 140/140

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growing an #interference wave #baby

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tomxor

remix of d/19914 by u/rep_movsd

function u(t) {

R=t?t*X*A&A:X=A=127;if(X+A)for(Y=B=--X&A;++Y+B-812;x.fillRect(R/2+X*S(k=Y/A/2)*k+960,R/8+Y,5,5))x.fillStyle='#9522'

Sep 12 2020 1:10 PM UTC

}// 115/140

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Smaller #Coconut

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tomxor

function u(t) {

c.outerHTML='<code style="font-size:64px">uofuwe`</code>'

Aug 1 2020 9:29 PM UTC

}// 57/140

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If the message is tiny, does it matter that my cypher sucks?

Show more comments…
u/tomxor

#codebreaking
u/DataMeta

heheh
u/tomxor

I guess I should give some hints... You can guess the message and the key, so how is it encrypted?
u/tomxor

It's not standard, it's very insecure, but very easy to implement. done in JS
u/DataMeta

Hmm, I'm curious but honestly don't completely follow. Care to give another nudge without giving it away totally?
u/tomxor

sure. tbh even though it's simple, it will never be obvious unless you have at least some experience with cryptanalysis (that also exludes me).
u/tomxor

The cipher is the simplest way I could think of making a stream cipher, where the keystream is just one 32bit LFSR seeded with the "key". The key is the ascii encoding of a string truncated to 32bits. This is combined (ok it's XORed) with the plaintext, but something else is done to preserve the printability in ASCII encoding. So the unknowns here are message and key (but you can guess them, they are on the page) and the 32bit LFSR used and how it's combined with the plaintext.
u/tomxor

As far as I understand this is fundamentally insecure because the PRNG is a single LFSR, which makes the entire keystream linear and susceptible to cryptanalysis methods i'm not familiar with.
u/tomxor

I'll post the exact method here in a week.
u/DataMeta

Interesting. Thanks for laying it out - learned some things looking stuff up. Will be giving it a thonk.
u/tomxor

Will, add bits of solution occasionally, LMK if you just want it all.
u/tomxor

Converting key from string to 32bit int for LFSR PRNG: x = parseInt([...key.slice(0,4)].map(c => c.charCodeAt(0).toString(2).padStart(8, 0)).join(''), 2)
u/tomxor

Combining keystream (x) with plaintext to get ciphertext: ciphertxt = [...plaintxt].map(c => {c = String.fromCharCode(x & 31 ^ c.charCodeAt(0));x = LFSR(x);return c;}).join('')
u/tomxor

Remaining pieces: keytext, plaintext, LFSR function.
u/tomxor

key = 'dwitter'; plaintxt = 'awesome'
u/tomxor

Only piece left is which 32bit LFSR is used to generate keystream x.

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tomxor

function u(t) {

c.width=8,R=[1],p=t*60&7,A=S[p],B=R[p]
S[p]=A^B^C
C=(A^B)&C|A&B
for(i=24;i--;)x.fillRect(X=i&7,Y=i>>3,1,Y&2?X==p&C:[S,R][Y][X])

Mar 25 2020 12:19 PM UTC

}// 127/140

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1-bit serial adder

u/tomxor

No +'s were harmed in this dweet
u/tomxor

Change incremement register R to any little endian (logical order) binary e.g R[...'1101'] = 11
u/tomxor

Change incremement register R to any little endian (logical order) binary e.g R[...'1101'] = 11

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tomxor

remix of d/15526 by u/mildlybean

function u(t) {

Z=_=>S((S(X)**2+S(Y)**3)*3.14+t*6)**6/4
for(c.width=i=1024;i-=1/16;x.fillRect(48*(X*2+Y+11),48*(X/2-Y+z),1,5))z=6-Z(X=i%8-4,Y=i/128-4)

Aug 27 2019 8:00 AM UTC

}// 134/140

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tomxor

remix of d/15329 by u/tomxor

function u(t) {

for(a=b=0,i=1e4*(t<8);i--;x.fillRect(a*640-160,b*640+640,1,.05))
r=0|4*Math.random(),
a+=.3*(r-a+b*S(a*3.14)),
b+=.3*(0-a*b+C(a*3.14))

Aug 10 2019 11:19 AM UTC

}// 134/140

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Chaos Photographer, Pic 2

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tomxor

remix of d/15329 by u/tomxor

function u(t) {

for(a=b=0,i=1e4;i--;x.fillRect(a*2880-480,b*2880-960,1,1/(4+t)))
p=3.14,r=0|2*Math.random(),
a+=.2*(r-a*S(b*p+C(a*p+C(a*p)))),
b+=.4*(r-a*b)

Aug 9 2019 4:40 PM UTC

}// 140/140

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Sand

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