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From: <Saved by Blink>
Snapshot-Content-Location: https://blog.excalidraw.com/end-to-end-encryption/
Subject: End-to-End Encryption in the Browser | Excalidraw Blog
Date: Thu, 24 Aug 2023 22:27:53 -0000
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kJggg=3D=3D" style=3D"height:1.75rem;vertical-align:middle;padding-right:0.=
0875rem;margin:0" alt=3D"excalidraw"> Open Excalidraw</a></div><span style=
=3D"clear:both"></span></header><main class=3D"blog-post"><h1 style=3D"marg=
in-bottom:0">End-to-End Encryption in the Browser</h1><p style=3D"margin-bo=
ttom:1.75rem;font-family:var(--ui-font)"><strong>March 21, 2020</strong><sp=
an style=3D"opacity:0.75;font-style:italic">, by <a href=3D"https://twitter=
.com/vjeux">vjeux</a></span></p><div>
<p>By default, <strong>Excalidraw</strong> doesn=E2=80=99t send anything yo=
u draw to the server. But sometimes it is useful to be able to send a link =
to the scene you are working on to someone else.</p>
<p>You could save the drawing to a file, send it to the other person, and h=
ave them open it. But that=E2=80=99s pretty cumbersome. In this post we=E2=
=80=99ll show how it=E2=80=99s possible to share just a link without the se=
rver having access to the data.</p>
<h2>Traditional Website Architecture</h2>
<p>In a traditional website architecture, you=E2=80=99d save a scene by sen=
ding it to the server, which gives you a shareable URL. The recipient then =
downloads the scene data from the server.</p>
<p>In that world, you trust the server to contain your information but you =
don=E2=80=99t have to trust the pipes in between the client and the server,=
because you use HTTPS to encrypt the data.</p>
<p><a href=3D"https://excalidraw.com/#json=3D5649116445016064,yOfExolZoMhtG=
nysT3-LWA">https://excalidraw.com/#json=3D5649116445016064,yOfExolZoMhtGnys=
T3-LWA</a></p>
<p>This works well unless the server gets compromised. The attacker will ha=
ve access to every single drawing ever made! This is something we=E2=80=99d=
like to avoid.</p>
<h2>End-to-End Encryption</h2>
<p>WhatsApp popularized end-to-end encryption, a technique that allows vari=
ous clients to communicate without the server being able to read the conten=
t of the communication.</p>
<p>The idea is to encrypt the content before sending it to the server. The =
server would just store the encrypted blob and send it back to the client.<=
/p>
<p><a href=3D"https://excalidraw.com/#json=3D5645858175451136,8w-G0ZXiOfRYA=
n7VWpANxw">https://excalidraw.com/#json=3D5645858175451136,8w-G0ZXiOfRYAn7V=
WpANxw</a></p>
<p>The biggest challenge with this architecture is how to distribute the ke=
y to encrypt the message in such a way that the server cannot see it.</p>
<p>Thankfully, in the context of a website, we can exploit the hash part of=
the URL. Anything that=E2=80=99s added after the <code class=3D"language-t=
ext">#</code> doesn=E2=80=99t get sent to the server, but is readable from =
the client-side JavaScript code.</p>
<p><a href=3D"https://excalidraw.com/#json=3D5660568841093120,vki3y9xuEulFV=
HDqt-PBMw">https://excalidraw.com/#json=3D5660568841093120,vki3y9xuEulFVHDq=
t-PBMw</a></p>
<h2>Show me the code</h2>
<p>Fortunately, the Web Cryptography APIs are now widely available to all t=
he browsers that let us implement this. That said, the APIs to deal with en=
cryption, keys and binary data are not the most straightforward, this next =
section walks you through how to wire it all together.</p>
<h3>Upload</h3>
<p>We generate a random key that will be used to encrypt the data.</p>
<div class=3D"gatsby-highlight" data-language=3D"javascript"><pre class=3D"=
language-javascript"><code class=3D"language-javascript"><span class=3D"tok=
en keyword">const</span> key <span class=3D"token operator">=3D</span> <spa=
n class=3D"token keyword">await</span> window<span class=3D"token punctuati=
on">.</span>crypto<span class=3D"token punctuation">.</span>subtle<span cla=
ss=3D"token punctuation">.</span><span class=3D"token function">generateKey=
</span><span class=3D"token punctuation">(</span>
<span class=3D"token punctuation">{</span> name<span class=3D"token opera=
tor">:</span> <span class=3D"token string">"AES-GCM"</span><span class=3D"t=
oken punctuation">,</span> length<span class=3D"token operator">:</span> <s=
pan class=3D"token number">128</span> <span class=3D"token punctuation">}</=
span><span class=3D"token punctuation">,</span>
<span class=3D"token boolean">true</span><span class=3D"token punctuation=
">,</span> <span class=3D"token comment">// extractable</span>
<span class=3D"token punctuation">[</span><span class=3D"token string">"e=
ncrypt"</span><span class=3D"token punctuation">,</span> <span class=3D"tok=
en string">"decrypt"</span><span class=3D"token punctuation">]</span><span =
class=3D"token punctuation">,</span>
<span class=3D"token punctuation">)</span><span class=3D"token punctuation"=
>;</span></code></pre></div>
<p>We encrypt the content with that random key. In this case, we only encry=
pt the content once with the random key so we don=E2=80=99t need an <code c=
lass=3D"language-text">iv</code> and can leave it filled with 0 (<a href=3D=
"https://www.youtube.com/watch?v=3DLP1t_pzxKyE">I hope=E2=80=A6</a>).</p>
<div class=3D"gatsby-highlight" data-language=3D"javascript"><pre class=3D"=
language-javascript"><code class=3D"language-javascript"><span class=3D"tok=
en keyword">const</span> encrypted <span class=3D"token operator">=3D</span=
> <span class=3D"token keyword">await</span> window<span class=3D"token pun=
ctuation">.</span>crypto<span class=3D"token punctuation">.</span>subtle<sp=
an class=3D"token punctuation">.</span><span class=3D"token function">encry=
pt</span><span class=3D"token punctuation">(</span>
<span class=3D"token punctuation">{</span> name<span class=3D"token opera=
tor">:</span> <span class=3D"token string">"AES-GCM"</span><span class=3D"t=
oken punctuation">,</span> iv<span class=3D"token operator">:</span> <span =
class=3D"token keyword">new</span> <span class=3D"token class-name">Uint8Ar=
ray</span><span class=3D"token punctuation">(</span><span class=3D"token nu=
mber">12</span><span class=3D"token punctuation">)</span> <span class=3D"to=
ken comment">/* don't reuse key! */</span> <span class=3D"token punctuation=
">}</span><span class=3D"token punctuation">,</span>
key<span class=3D"token punctuation">,</span>
<span class=3D"token keyword">new</span> <span class=3D"token class-name"=
>TextEncoder</span><span class=3D"token punctuation">(</span><span class=3D=
"token punctuation">)</span><span class=3D"token punctuation">.</span><span=
class=3D"token function">encode</span><span class=3D"token punctuation">(<=
/span><span class=3D"token constant">JSON</span><span class=3D"token punctu=
ation">.</span><span class=3D"token function">stringify</span><span class=
=3D"token punctuation">(</span>content<span class=3D"token punctuation">)</=
span><span class=3D"token punctuation">)</span><span class=3D"token punctua=
tion">,</span>
<span class=3D"token punctuation">)</span><span class=3D"token punctuation"=
>;</span></code></pre></div>
<p>We upload the encrypted content to the server. Note that we don=E2=80=99=
t send the key to the server!</p>
<div class=3D"gatsby-highlight" data-language=3D"javascript"><pre class=3D"=
language-javascript"><code class=3D"language-javascript"><span class=3D"tok=
en keyword">const</span> response <span class=3D"token operator">=3D</span>=
<span class=3D"token keyword">await</span> <span class=3D"token punctuatio=
n">(</span>
<span class=3D"token keyword">await</span> <span class=3D"token function"=
>fetch</span><span class=3D"token punctuation">(</span><span class=3D"token=
string">"/upload"</span><span class=3D"token punctuation">,</span> <span c=
lass=3D"token punctuation">{</span>
method<span class=3D"token operator">:</span> <span class=3D"token stri=
ng">"POST"</span><span class=3D"token punctuation">,</span>
body<span class=3D"token operator">:</span> encrypted<span class=3D"tok=
en punctuation">,</span>
<span class=3D"token punctuation">}</span><span class=3D"token punctuatio=
n">)</span>
<span class=3D"token punctuation">)</span><span class=3D"token punctuation"=
>.</span><span class=3D"token function">json</span><span class=3D"token pun=
ctuation">(</span><span class=3D"token punctuation">)</span><span class=3D"=
token punctuation">;</span></code></pre></div>
<p>We generate the shareable URL. We use the <code class=3D"language-text">=
jwk</code> encoding in order to extract a base64 version of the key instead=
of having a binary encoded one.</p>
<div class=3D"gatsby-highlight" data-language=3D"javascript"><pre class=3D"=
language-javascript"><code class=3D"language-javascript"><span class=3D"tok=
en keyword">const</span> objectURL <span class=3D"token operator">=3D</span=
> response<span class=3D"token punctuation">.</span>url<span class=3D"token=
punctuation">;</span>
<span class=3D"token keyword">const</span> objectKey <span class=3D"token o=
perator">=3D</span> <span class=3D"token punctuation">(</span><span class=
=3D"token keyword">await</span> window<span class=3D"token punctuation">.</=
span>crypto<span class=3D"token punctuation">.</span>subtle<span class=3D"t=
oken punctuation">.</span><span class=3D"token function">exportKey</span><s=
pan class=3D"token punctuation">(</span><span class=3D"token string">"jwk"<=
/span><span class=3D"token punctuation">,</span> key<span class=3D"token pu=
nctuation">)</span><span class=3D"token punctuation">)</span><span class=3D=
"token punctuation">.</span>k<span class=3D"token punctuation">;</span>
<span class=3D"token keyword">const</span> url <span class=3D"token operato=
r">=3D</span> objectURL <span class=3D"token operator">+</span> <span class=
=3D"token string">"#key=3D"</span> <span class=3D"token operator">+</span> =
objectKey<span class=3D"token punctuation">;</span>
<span class=3D"token comment">// Example: https://excalidraw.com/?scene=3D1=
234#key=3DBQ1moYESmTEXgtA1KozyVw</span></code></pre></div>
<h2>Download</h2>
<p>In the opposite direction, we download the file back from the server.</p=
>
<div class=3D"gatsby-highlight" data-language=3D"javascript"><pre class=3D"=
language-javascript"><code class=3D"language-javascript"><span class=3D"tok=
en keyword">const</span> response <span class=3D"token operator">=3D</span>=
<span class=3D"token keyword">await</span> <span class=3D"token function">=
fetch</span><span class=3D"token punctuation">(</span><span class=3D"token =
template-string"><span class=3D"token template-punctuation string">`</span>=
<span class=3D"token string">/download?id=3D{id}</span><span class=3D"token=
template-punctuation string">`</span></span><span class=3D"token punctuati=
on">)</span><span class=3D"token punctuation">;</span>
<span class=3D"token keyword">const</span> encrypted <span class=3D"token o=
perator">=3D</span> <span class=3D"token keyword">await</span> response<spa=
n class=3D"token punctuation">.</span><span class=3D"token function">arrayB=
uffer</span><span class=3D"token punctuation">(</span><span class=3D"token =
punctuation">)</span><span class=3D"token punctuation">;</span></code></pre=
></div>
<p>The key that we encoded in the url is the <code class=3D"language-text">=
k</code> field of the <code class=3D"language-text">jwk</code> object that =
represents the key. In order to get back a full key object we need to repro=
duce all the other fields that are static. It=E2=80=99s pretty verbose but =
it works!</p>
<div class=3D"gatsby-highlight" data-language=3D"javascript"><pre class=3D"=
language-javascript"><code class=3D"language-javascript"><span class=3D"tok=
en keyword">const</span> objectKey <span class=3D"token operator">=3D</span=
> window<span class=3D"token punctuation">.</span>location<span class=3D"to=
ken punctuation">.</span>hash<span class=3D"token punctuation">.</span><spa=
n class=3D"token function">slice</span><span class=3D"token punctuation">(<=
/span><span class=3D"token string">"#key=3D"</span><span class=3D"token pun=
ctuation">.</span>length<span class=3D"token punctuation">)</span><span cla=
ss=3D"token punctuation">;</span>
<span class=3D"token keyword">const</span> key <span class=3D"token operato=
r">=3D</span> <span class=3D"token keyword">await</span> window<span class=
=3D"token punctuation">.</span>crypto<span class=3D"token punctuation">.</s=
pan>subtle<span class=3D"token punctuation">.</span><span class=3D"token fu=
nction">importKey</span><span class=3D"token punctuation">(</span>
<span class=3D"token string">"jwk"</span><span class=3D"token punctuation=
">,</span>
<span class=3D"token punctuation">{</span>
k<span class=3D"token operator">:</span> objectKey<span class=3D"token =
punctuation">,</span>
alg<span class=3D"token operator">:</span> <span class=3D"token string"=
>"A128GCM"</span><span class=3D"token punctuation">,</span>
ext<span class=3D"token operator">:</span> <span class=3D"token boolean=
">true</span><span class=3D"token punctuation">,</span>
key_ops<span class=3D"token operator">:</span> <span class=3D"token pun=
ctuation">[</span><span class=3D"token string">"encrypt"</span><span class=
=3D"token punctuation">,</span> <span class=3D"token string">"decrypt"</spa=
n><span class=3D"token punctuation">]</span><span class=3D"token punctuatio=
n">,</span>
kty<span class=3D"token operator">:</span> <span class=3D"token string"=
>"oct"</span><span class=3D"token punctuation">,</span>
<span class=3D"token punctuation">}</span><span class=3D"token punctuatio=
n">,</span>
<span class=3D"token punctuation">{</span> name<span class=3D"token opera=
tor">:</span> <span class=3D"token string">"AES-GCM"</span><span class=3D"t=
oken punctuation">,</span> length<span class=3D"token operator">:</span> <s=
pan class=3D"token number">128</span> <span class=3D"token punctuation">}</=
span><span class=3D"token punctuation">,</span>
<span class=3D"token boolean">false</span><span class=3D"token punctuatio=
n">,</span> <span class=3D"token comment">// extractable</span>
<span class=3D"token punctuation">[</span><span class=3D"token string">"d=
ecrypt"</span><span class=3D"token punctuation">]</span><span class=3D"toke=
n punctuation">,</span>
<span class=3D"token punctuation">)</span><span class=3D"token punctuation"=
>;</span></code></pre></div>
<p>We decrypt the message, decode it to string and parse it back as JSON.</=
p>
<div class=3D"gatsby-highlight" data-language=3D"javascript"><pre class=3D"=
language-javascript"><code class=3D"language-javascript"><span class=3D"tok=
en keyword">const</span> decrypted <span class=3D"token operator">=3D</span=
> <span class=3D"token keyword">await</span> window<span class=3D"token pun=
ctuation">.</span>crypto<span class=3D"token punctuation">.</span>subtle<sp=
an class=3D"token punctuation">.</span><span class=3D"token function">decry=
pt</span><span class=3D"token punctuation">(</span>
<span class=3D"token punctuation">{</span> name<span class=3D"token opera=
tor">:</span> <span class=3D"token string">"AES-GCM"</span><span class=3D"t=
oken punctuation">,</span> iv<span class=3D"token operator">:</span> <span =
class=3D"token keyword">new</span> <span class=3D"token class-name">Uint8Ar=
ray</span><span class=3D"token punctuation">(</span><span class=3D"token nu=
mber">12</span><span class=3D"token punctuation">)</span> <span class=3D"to=
ken punctuation">}</span><span class=3D"token punctuation">,</span>
key<span class=3D"token punctuation">,</span>
encrypted<span class=3D"token punctuation">,</span>
<span class=3D"token punctuation">)</span><span class=3D"token punctuation"=
>;</span>
<span class=3D"token keyword">const</span> decoded <span class=3D"token ope=
rator">=3D</span> <span class=3D"token keyword">new</span> <span class=3D"t=
oken class-name">window<span class=3D"token punctuation">.</span>TextDecode=
r</span><span class=3D"token punctuation">(</span><span class=3D"token punc=
tuation">)</span><span class=3D"token punctuation">.</span><span class=3D"t=
oken function">decode</span><span class=3D"token punctuation">(</span><span=
class=3D"token keyword">new</span> <span class=3D"token class-name">Uint8A=
rray</span><span class=3D"token punctuation">(</span>decrypted<span class=
=3D"token punctuation">)</span><span class=3D"token punctuation">)</span><s=
pan class=3D"token punctuation">;</span>
<span class=3D"token keyword">const</span> content <span class=3D"token ope=
rator">=3D</span> <span class=3D"token constant">JSON</span><span class=3D"=
token punctuation">.</span><span class=3D"token function">parse</span><span=
class=3D"token punctuation">(</span>decoded<span class=3D"token punctuatio=
n">)</span><span class=3D"token punctuation">;</span></code></pre></div>
<h2>Conclusion</h2>
<p>As the maintainer of <a href=3D"https://excalidraw.com/">Excalidraw</a>,=
I now sleep much better at night. If the hosting service gets compromised,=
it doesn=E2=80=99t really matter as none of the content can be decrypted w=
ithout the key.</p>
<p>It also gives me the peace of mind to use <strong>Excalidraw</strong> fo=
r work related projects knowing that nothing will leak.</p>
<p>If you=E2=80=99re building a website that needs to store data on the ser=
ver, you may want to add end-to-end encryption, it=E2=80=99s pretty easy!</=
p></div><p style=3D"font-family:var(--ui-font);margin-bottom:0"><a href=3D"=
https://mobile.twitter.com/search?q=3Dhttps%3A%2F%2Fblog.excalidraw.com%2Fe=
nd-to-end-encryption%2F">Discuss on Twitter</a> =E2=80=A2 <a href=3D"https:=
//github.com/excalidraw/excalidraw-blog/edit/master/content/blog/end-to-end=
-encryption/index.md">Edit on GitHub</a></p><hr style=3D"margin:1.75rem 0">=
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@font-face { font-family: Merriweather; font-style: italic; font-display: s=
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@font-face { font-family: Merriweather; font-style: normal; font-display: s=
wap; font-weight: 400; src: local("Merriweather Regular "), local("Merriwea=
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