Hot 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: #Food

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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?

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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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tomxor

remix of d/19543 by u/KilledByAPixel

function u(t) {

for(c.width=w=127,i=8e3;i--;t?p&&p<8&T[r=t&8?i-w-r%3:i+w+r%3]<7&&--T[i]&++T[r]:T[i]=r%9)
p=T[i],x.fillRect(X=i&w,Y=i>>7,1,p/9),r=i*t+Y/3&X/3

Jul 29 2020 12:16 AM UTC

}// 140/140

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#Serpinski #Hourglass

u/KilledByAPixel

👍
u/magna

Damn!
u/katkip

wow

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tomxor

remix of d/17768 by u/tomxor

function u(t) {

eval(unescape(escape`𨰮𭱩𩁴𪀽𝐶𞀻𫠽𭀿𫠮𫑡𬀨𚁛𠐬𠠬𦀬𦐬𥁝𚐽🡛𠐫𚁃𛑘𚐯𞐹𛁂𚰨𤰭𦐩𛰹𞐬𦀫𠐯𝀬𦐫𠠯𝀬𥀬𮀮𩡩𫁬𤱴𮑬𩐽𤠨𜐲𝰫𠐪𞐬𞐹𚱂𚠹𛀲𝐵𛁳👔𛱴𚐬𮀮𩡩𫁬𤡥𨱴𚁘𛁙𛁳𚠽𞐬𬰩𧐩𞡛𧐻𫱮𫑯𭑳𩑭𫱶𩐽𚁻𮀬𮑽𚐽🡮𦱴𚠶𜀦𜠵𝑝👛𮀭𠰬𮐭𤰬𠰽𮀬𤰽𮐬𭁝`.replace(/u../g,'')))

Jul 3 2020 12:09 AM UTC

}// 140/140

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Conjure a Spell !

u/tomxor

#interactive #particles #physics
u/1593619985251admin@google.com

fancy
u/katkip

isn't "cast" the right word :D
u/tomxor

lol i guess so, naming #fail :D

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tomxor

remix of d/19279 by u/rodrigo.siqueira

function u(t) {

f=(X,Y,n=9)=>n>X*X?f(X*X-Y*Y+C(X)-C(t*n/4),X*Y+1,n+S):x.fillStyle=R(n,n/3);for(i=9e3;i--;f(X/250-4,i/2e3-2))x.fillRect(X=i%128*S,i/8,S,S=16)

Jun 30 2020 11:23 PM UTC

}// 140/140

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Hmm, #julia set #fractal

u/tomxor

C(t*n)? Strange how it doesn't perceptibly speed up.

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tomxor

function u(t) {

for(c.width=128,i=1e4;i--;x.fillRect(X=i&127,Y=i>>7,1,C(u[i]=(u[i]||0)+(T&&(K=16-Math.hypot(T.x/4-X,T.y/4-Y))>0?K/64:0))))onmousemove=e=>T=e

Jun 19 2020 3:33 PM UTC

}// 140/140

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Spooky #paint O_o

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tomxor

remix of d/19162 by u/katkip

function u(t) {

f=(x,y,n)=>n?f(S(x*2+t)-C(y*2-t),C(x*2-t)-C(y*2+t),n-1):S(x+y)
for(c.width=160,i=24e3;i--;)
x.fillRect(X=i&255,Y=i>>8,1,f(Y/64,X/64,5))

Jun 17 2020 3:48 PM UTC

}// 135/140

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Liquid Metal

u/tomxor

I wanted to see it move O_O this function is pretty cool katkip
u/katkip

Thx :)

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tomxor

remix of d/19162 by u/katkip

function u(t) {

f=(x,y,n)=>n?f(S(x*2+1)-C(y*2),C(x*2-1)-C(y*2),n-1):S(x+y)
for(n=8,i=n*1920;i--;)
x.fillRect(X=i%1920,Y=i/1920+n*t*60,1,f(Y/640,X/640,5))

Jun 17 2020 3:47 PM UTC

}// 137/140

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u/13thptr

nice and polished

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tomxor

remix of d/12717 by u/tomxor

function u(t) {

eval(unescape(escape`𩡯𬠨𨰮𭱩𩁴𪀽𪐽𜠵𝠻𪐭𛐻𨰮𬱴𮑬𩐽𙱢𨑣𪱧𬡯𭑮𩀺𘰰𡠰𙰩𮀮𩡩𫁬𤡥𨱴𚀱𜠸𯁩𙠱𝐬𝠴𯁩🠾𝀬𜐬𘐡𚁸𛡦𪑬𫁓𭁹𫁥👛𛁒𚀩𛀧𘱆𡡆𙱝𦰢𱲤񌢢𺑺𒀚񉣯𰃦𶂠񊃩𱣎𶂉񃒗𹃎񉒤񂲗𾳦𮑃񉢘񌓩𶁼񅣩𰢡𶂘񉢕񋃨񌀂񌠢𛡣𪁡𬡃𫱤𩑁𭀨𪐯𝐩𛰳𚠪𚁩𙐵𚐥𜱼𜁝𚐩`.replace(/u../g,'')))

Jun 16 2020 3:35 PM UTC

}// 139/140

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Hi Bee :) #atari #retro colour

u/tomxor

Finally managed to fit a colour version, I love this little bee :)
u/tomxor

#bee
u/tomxor

#sprite
u/tomxor

#pixelart

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tomxor

remix of d/19006 by u/tomxor

function u(t) {

eval(unescape(escape`𨰮𭱩𩁴𪀽𛐱𞱴🱰𛡭𨑰𚀨𦱁𛁂𧐬𪐩🐾𬀽𬀮𫑡𬀨𚁛𨐬𨡝𛁪𚐽🠨𦀽𠐭𨐬𦐽𠠭𨠬𬠽𦀪𦀫𦐪𦐬𬠯👲𛰶𛐹𝠬𪠭𪐼𜰦𪠾𪐿𦱡𚱘𛱲𛁢𚱙𛱲𛁸𛡭𫱶𩑔𫰨𠐬𠠩𛁸𛡬𪑮𩑔𫰨𨐬𨠩𧐺𦱡𛁢𧐩𚐩𞡰👛𧐻𬁛𭀪𜰦𜰱𧐽𦰹𞐫𤰨𭀩𚠴𞀬𞀰𚱃𚁴𛰳𚐪𝀸𧐻𮀮𬱴𬡯𪱥𚀩`.replace(/u../g,'')))

Jun 2 2020 1:36 AM UTC

}// 140/140

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#zhezhi #origami #physics

Show more comments…
u/tomxor

#waitforit ...
u/tomxor

Thanks u/nburn42 for suggesting lines
u/tomxor

Fold your own: ;onmousemove=e=>p[t*3&31]=[e.x/2,e.y/2];
u/ntsutae

Awesome
u/nburn42

Love it
u/KilledByAPixel

Amazing, hey tomxor, I'd like to get you involved in a project I'm working on, how can I contact you?
u/katkip

amazing
u/username

fucking sick
u/aleamb

WOW!
u/magna

WHAT
u/katkip

#witchcraft
u/rafroller

AMAZING <3
u/donbright

!!!!!!!!!!!!!!!
u/vain

Incredible! It lives... But i'm lost for words

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tomxor

function u(t) {

eval(unescape(escape`𨰮𭱩𩁴𪀽𛐱𞱴🱰𛡭𨑰𚀨𦱁𛁂𧐩🐾𬀽𬀮𫑡𬀨𚁛𨐬𨠬𨰽𨐬𩀽𨡝𚐽🠨𮀮𩡩𫁬𤡥𨱴𚁡𛁢𛀳𛀳𚐬𬠽𣑡𭁨𛡨𮑰𫱴𚁘👁𛑡𛁙👂𛑢𚑼𯀱𛁲𛰽𚁲𛐴𞀩𚠪𜰯𝱥𝀬𦱡𚰨𨐭𨰩𛰲𚱘𛱲𛁢𚰨𨠭𩀩𛰲𚱙𛱲𛁡𛁢𧐩𚐩𞡰👛𧐻𬁛𭀪𜠦𝠳𧐽𦰱𝐰𚱃𚁴𚐬𞀰𚱓𚁴𚑝`.replace(/u../g,'')))

May 31 2020 10:19 PM UTC

}// 138/140

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Say hello to fluffy !!

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u/tomxor

I was aiming for a #micelle using something like SPH, it arguably looks a bit like that after 30 seconds... or maybe an amoeba. It's not very SPH, basically just n-body with verlet integration and this simple pairwise constraint: k*(r-48)**3 where r is the distance between the particles and k is a stiffness parameter.
u/nburn42

How do you encode that? I tired for a little while to build something to do it, but failed.
u/nburn42

I'll try again later and I'll get it eventually, but it would be nice if there was some tool somewhere.
u/tomxor

d/11852 to get the source just replace eval with throw
u/nburn42

Thanks!
u/nburn42

https://www.dwitter.net/d/19014
u/Xen

very nice!, hypnotic

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