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[liberationtech] Encipher.it

Wasabee wasabee18 at gmail.com
Tue Jun 18 13:13:05 PDT 2013


why does everyone want to trust yet another third party to encrypt data 
on their behalf :)?
if u want to encrypt stuff, u should do it on ur machine. Maybe what 
people should be searching for is an easy-to-use, audited and open 
source stack to do it.
if we are too lazy to do it ourselves and want to outsource it to an 
online service; this we dont really value ourprivacy after all. there is 
no gain without a little pain.

On 18/06/2013 21:05, Steve Weis wrote:
> It's not safe.
>
> This is their bookmarklet:
> (function(){document.body.appendChild(document.createElement('script')).src='https://encipher.it/javascripts/inject.js';})( 
> <https://encipher.it/javascripts/inject.js%27;%7D%29%28>);
>
> That loads a JavaScript file from the encipher.it <http://encipher.it> 
> site, which can be changed at any time and compromise your messages 
> without your knowledge.
>
> The actual call to encrypt data is here: 
> https://encipher.it/javascripts/encipher.js :
> """
> hmac = hex_hmac_sha1(key, _this.text);
> hmac += hmac.slice(0, 24);
> cipher = hmac + salt + Aes.Ctr.encrypt(_this.text, key, 256);
> """
>
> They're MACing the key for some reason, then using unauthenticated CTR 
> mode without an HMAC. So this is completely vulnerable to someone 
> modifying the ciphertext.
>
> That CTR mode is implemented by this: 
> https://encipher.it/javascripts/AES.js. That's using the time of day 
> as a nonce combined with a weak JS Math.random(). That's vulnerable to 
> some attacks as well.
>
> Generally, I'd assume that a random crypto project you run across is 
> probably not safe.
>
>
> On Tue, Jun 18, 2013 at 11:51 AM, Lorenzo Franceschi Bicchierai 
> <lorenzofb8 at gmail.com <mailto:lorenzofb8 at gmail.com>> wrote:
>
>     Have you guys seen this?
>
>     https://encipher.it/
>
>     I've searched through the archives but didn't see anything. I'm
>     wondering how safe this is.
>
>     It has received some small attention on the media before.
>
>     http://www.pcworld.com/article/255938/encipher_it_encrypts_email_for_free.html
>
>
>     Thoughts?
>
>     -- 
>     *Lorenzo Franceschi-Bicchierai
>     *Mashable <http://www.mashable.com> Junior US & World Reporter
>     lorenzo at mashable.com <mailto:lorenzo at mashable.com> |
>     lorenzofb8 at gmail.com <mailto:lorenzofb8 at gmail.com>
>     #: (+1) 917 257 1382
>     Twitter: @lorenzoFB <http://www.twitter.com/lorenzoFB>
>     Skype: lorenzofb8
>     OTR: lorenzofb at jabber.ccc.de <mailto:lorenzofb at jabber.ccc.de>
>     www.lorenzofb.com <http://www.lorenzofb.com>
>
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