Random dweets | Dwitter

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: #Food

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taupelink

remix of d/29696 by u/taupelink

function u(t) {

f=(u,m=5)=>(m?f(u,m-1)-m:u%4-2)**2/2;g=n=>f(X*n/8)+f(Y*(4-n)/8)&3;for(i=1e4;i--;x.fillRect(15*X,60+15*Y,g(1)^g(3),t<g(2)))X=i*t%128,Y=X*i%64

Apr 16 2024 4:03 AM UTC

}// 140/140

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d/29796

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KilledByAPixel

remix of d/17007 by u/KilledByAPixel

function u(t) {

for(c.width|=i=259,x.translate(1e3,99);i--;q='— ',x.fillText(r+q+q+q+q+r,(a>>4)%2*10-65,9))x.scale(z=1.02,z),r=(a=i+t*60|0)%64?'   ':' ♜ '

Jan 15 2020 6:34 PM UTC

}// 138/140

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Chessboard Path #Castle #D3

u/DataMeta

It seems the Queen visited the apothecary :)
u/KilledByAPixel

#chess

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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.
u/ximavus

nice idea

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tibbifox

function u(t) {

c.width|=0;for(i=Q=-960;i<-Q;i+=48)for(j=A=-540;j<-A;j+=48)s=S(i*66*(k=3e-4)*C(t+i*k+j*k))*24,x.fillRect(i-Q-s,j-A-s,s*=2,s)

Apr 26 2017 10:27 AM UTC

}// 124/140

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rodrigo.siqueira

remix of d/28553 by u/rodrigo.siqueira

function u(t) {

c.style.filter=`sepia()invert(`
for(a=b=t,i=5e4;i--;a+=(r=i*t/b&1)/5+b*S(a*3)/9,b+=C(a*6-r)-a*b/9)x.fillRect(3200-a*2e3,b*420-2e3,.1,1)

Sep 26 2023 11:56 AM UTC

}// 135/140

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Ancient Weavers of Time

u/cantelope

#damson
u/rodrigo.siqueira

Anciens tisserands du temps

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zoulei

function u(t) {

c.width^=0;for(i=9;i<2e3;i+=2)s=3/(9.1-(t+i/99)%9),x.beginPath(),j=i*7+S(i*4+t+S(t)),x.lineWidth=s*s,x.arc(960,540,s*49,j,j+.6),x.stroke()

Dec 28 2017 8:51 AM UTC

}// 138/140

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katkip

remix of d/19278 by u/katkip

function u(t) {

c.style.filter=`invert(`,x.font='16em"'
x.fillStyle="#0ff",x.fillText("JS",100,600)
x.fillStyle="#000",x.fillText("1024       2021",350,600)

Jun 26 2021 4:06 PM UTC

}// 140/140

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I am organizing a javascript golfing competition! The second edition will start soon, check it out: https://js1024.fun

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SuperMayo

remix of d/13282 by u/SuperMayo

function u(t) {

r=Math.random;for(i=1;i<1e3;i++)x.fillRect(1.3*S(r()+t)*999,r()*999,r()*99,3),x.rotate(3),x.fillStyle=R(99+99*S(t),99+99*C(t*r()),140*r())

Apr 18 2019 8:30 AM UTC

}// 138/140

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pstefanlarsson

function u(t) {

c.width=1920; /* clear the canvas */
for(i=0;i<1920;i++){
h = 540*C(i*t);
x.fillRect(i, 540, 1, h)
}

Feb 28 2017 9:29 AM UTC

}// 101/140

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magna

remix of d/3271 by u/magna

function u(t) {

c.width|=0
for(i=112;i--;'āăćďğĿſǿğěıİŠŠ'.charCodeAt(Y=i>>3)&1<<X&&x.fillRect(X*4+(S(t*3.1)**5+1)*960,Y*4+(C(t*5.3)**7+1)*540,4,4))X=i&7

Jan 2 2025 4:01 PM UTC

}// 136/140

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Mouse hijack - crispy remix

u/magna

Breakdown: https://ates.dev/posts/2024-12-30-dweet-bitm…