Dweets awesomed by u/DataMeta

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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katkip

function u(t) {

‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎‎140

Aug 4 2020 8:26 AM UTC

}// 140/140

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u/tomxor

heh
u/DataMeta

lol

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KilledByAPixel

function u(t) {

eval(unescape(escape`󠁦󠁯󠁲󠀨󠁣󠀮󠁷󠁩󠁤󠁴󠁨󠁼󠀽󠁩󠀽󠀹󠀻󠁩󠀭󠀭󠀻󠀩󠁸󠀮󠁦󠁩󠁬󠁬󠁒󠁥󠁣󠁴󠀨󠀴󠀰󠀰󠀫󠁩󠀪󠀹󠀹󠀫󠁓󠀨󠁴󠀩󠀪󠀳󠀰󠀰󠀬󠀴󠀰󠀰󠀬󠀵󠀰󠀬󠀲󠀰󠀰󠀩`.replace(/uDB40%uDC/g,'')))

Aug 4 2020 8:18 AM UTC

}// 111/140

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Secret #default #crypto

Show more comments…
u/katkip

what?
u/Irratix

..... but how does that even work
u/Xen

nicely done
u/magna

HAX!
u/KilledByAPixel

small improvement: replace DB40%uDC/ with .{8}
u/tomxor

#steganography

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taupelink

function u(t) {

for(i=1e3;i--;x.fillRect(X*320,Y*180,Y%C(d=a[X|0])*X%S(e=a[Y|0]),C(d+e*e)*S(e/d)))X=(r=Math.random)()*6,Y=r()*6,a=[p=X*X,X,q=Y*Y,p+q,Y,p-q]

Aug 2 2020 7:00 PM UTC

}// 139/140

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d/19588

u/taupelink

looks like all-grey on iOS...not sure what's going on
u/taupelink

I think it has to do with the fillRect function and fractional widths. I wonder whether tiny widths get rounded up in iOS, filling in blanks that appear on other systems

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New_Core

function u(t) {

for(c.width|=i=22;i--;)x.beginPath(x.fill()),x.arc(380+i*18*S(a=S(t-i/25)),99+i*18*C(a),i<21?9:50,0,7),x.fillRect(700+i%9*99,400,50,200)

Aug 2 2020 8:04 AM UTC

}// 137/140

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Moments before it all started

u/katkip

*o*
u/veubeke

#unsatisfying :D

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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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DataMeta

function u(t) {

h=5381;w="test";for(i=0;i<w.length;i++)h=((h<<5)+h)+w.charCodeAt(i)
throw h

Aug 1 2020 8:46 PM UTC

}// 75/140

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simple djb-like non-#crypto hash function

u/DataMeta

1000BTC to anyone who implements SHA-2 in 140 bytes ;)

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taupelink

remix of d/19559 by u/taupelink

function u(t) {

e=X=>X/S(1/X);f=X=>e(X)>X?C(X):e(X/f(X/2));for(i=1440;i--;)a=i/240+(r=Math.random)(),b=i%8+r(),x.fillRect(a*300,b*140,f(T(a*b)/f(b))<f(a),1)

Aug 1 2020 6:08 PM UTC

}// 140/140

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d/19576

u/DataMeta

neat

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katkip

remix of d/19573 by u/jellyedwards

function u(t) {

t||(Q=540)
r=Math.random
x.beginPath()
x.fillRect(t*200,Q,9,9)
Q-=p=S(t*S(t*S(t))-Q/99)*2
x.fillStyle=p<0?"red":"lime"

Aug 1 2020 8:52 AM UTC

}// 118/140

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#crypto graph

u/DaSpider

Any decorative reason for that r=Math.random?

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jellyedwards

function u(t) {

c.width=200
for(i=40;i--;)
x.fillText(i%2?`🐦 @Celebrity${String.fromCharCode(65+i)}`:"Send BTC h̲e̲r̲e̲ & get 2x back!",20,(i+t*t/9)*20%800)

Aug 1 2020 8:17 AM UTC

}// 140/140

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#crypto twitter hack

u/katkip

!
u/Xen

lol

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Billedluh

function u(t) {

eval(unescape(escape`𨰮𭱩𩁴𪁼👷🐹𜀰𒡩𩠨𭀽🐰𚑹👛𧐬𭠽𦱝𒡦𫱲𚁩🐱𞱩🁷𞱩𚰫𚐊𮱩𩠨𭀼𛠱𯁼𮑛𪑝🠱𜠰𜁼𯁹𦱩𚰲𧐼𜀩𮑛𪑝👷𛁶𦱩𧐽𞐪𠰨𪐪𞐪𭀩𛐳𜀬𮑛𪐫𭱝👷𛁶𦱩𚱷𧐽𞐪𤰨𪐫𝐩𒡸𛡦𪑬𫁒𩑣𭀨𮑛𪐫𭱝𚰽𭡛𪐫𭱝𛁹𦱩𧐫👶𦱩𧐫🐱𛑶𦱩𧐪𚁹𦱩𧐾𞐰𜀩𛰳𛀹𛀹𚑽`.replace(/u../g,'')))

Aug 1 2020 7:50 AM UTC

}// 140/140

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leak

Show more comments…
u/Billedluh

Give it a second to work out the perfectly sinusoidal bubbles.
u/Billedluh

Trigonometry isn't about triangles, it's about bubbles.
u/Billedluh

& I'm sure someone has already done this, I mostly post it so I can go to sleep.
u/Billedluh

source
u/Billedluh

source
u/Billedluh

c.width|=w=900 if(t==0)y=[],v=[] for(i=1;i<w;i++) {if(t<.1||y[i]>1200||y[i+2]<0)y[i]=w,v[i]=9*C(i*9*t)-30,y[i+w]=w,v[i+w]=9*S(i+5) x.fillRect(y[i+w]+=v[i+w],y[i]+=v[i]+=1-v[i]*(y[i]>900)/3,9,9)}

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