组装您的密码与Passpack
2007年4月26日 · 由大卫布雷得里
Tara凯利从passpack.com最近评论对我们 密码为科学家 岗位。 引起您的对一种新方法的注意到存放您的密码。
现在，我们有通过痛苦是的所有存放，并且检索密码为所有那些成千上万社会网络位置、我们各种各样的MySpace和YouTube认为，一切从Digg到HotDiggedy需要一个独特的用户名和密码组合。
以我们的密码为科学家岗位，我们给了您一个想法关于怎样创造强的密码， Kelly女士提供亲切地扩展的更加隐秘建议而不是使用一个唯一化学式您增加两三个词，因此，例如您的passphrase也许成为C6H12O6腐烂牙或的事轻微地意思，其中只有您会知道。
不幸地，这仍然离开大开问题的怎样监视所有这些密码，强，他们也许和记住哪用户名同联系在一起。 有许多网上，并且离线密码经理可利用和我知道的几乎每个人，他们密码在的USB存储关键字哪些之内保护他们可能存放他们的密码一本总清单。
But, what if you forget your USB key when you are traveling, or cannot access a particular storage site because of a browser incompatibility in your library or cybercafe?
Passpack.com似乎有答复。 您向站点登记为自由(虽然它仅在beta，因此不依靠它100%就是)，创造用户ID，注册通行证和聪明地包装钥匙。 ID被送到站点到注册，您的密码修改只有的您的用户，以便它在一个被暴露的状态没有被送回到Passpack。 注册然后您的被加密的密码公文包触发器下载。
跑在browswer窗口的剧本(没有信息向前被送回到passpack从这个阶段)在您的浏览器视窗然后使用您的包装钥匙打开盒。 这给您和您(除非某人凝视在您的肩膀)对您的usernames和密码，每个组合的汇集的仅通入与适当的网站URL相关。
到目前为止，很好。
被尝试它两三次，它是非常容易设定和使用。 When you first login you see an array of black squares which are part of a unique anti-phishing mechanism associated with a phrase you get to choose that only you can ever see and that verifies that you are on the passpack system not a spoofed site. “It combines a custom Welcome message, IP recognition and hand-eye training,” Ms Kelly says.
However, I had a seriously nagging feeling that there is something missing from passpack - namely automatic login to your various websites. So, I dropped Tara at Passpack’s head office a line to see what she had to say about this fundamental issue and she came straight back to me, to tell me that this very feature - an auto-login tool - with a Smart Button - that does not rely on plugins is just about to be signed off and released (you can watc a demo here - http://passpack.wordpress.com/2007/03/22/passpack-auto-login-no-plugin-needed/). They’re also adding inline help to the application to make it easier to use. She also told me that, “We have a few small interface improvements almost ready to roll, as well as a few updates that handle some cosmetic issues in Mac Safari.”
The Smart Button is not yet implemented (it has been security validated, but needs some cosmetic fixes), so check back here again soon and I’ll update via the comments on this post so you get to hear as soon as it goes live. As it stands, Passpack just looks like a clever password storage facility with double encryption and a neat line in anti phishing bait. Once the Smart Button is enabled, however, it will steam ahead of the pack.
If you start using Passpack and then change your mind about it, you can always take your data with you. “We support complete export of your data,” Tara told me, “as well as encrypted back up copies.” The developers obviously want users to stay with them because they like the site not simply because of inertia or being locked in.
You can sign up for passpack.com here. Before you ask, no they aren’t paying me to promote the product (10% commission for a free product is $0, after all). It just seems to be a unique approach to a perennial problem that could help you.
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6 responses so far ↓
Marco Barulli // Apr 26, 2007 at 6:13 pm
Hi,
you might also be interested in trying Clipperz.
Clipperz is an online password manager with some uncommon features:
- automatic (direct) login to websites
- offline version
- …
To configure automated logins you just need to launch a bookmarklet from the page containing the login form.
And you are not limited to storing passwords, but any valuable textual information.
http://beta.clipperz.com
Please feel free to compare the security level of Clipperz with Passapack’s. (AES 256 instead of 128, SHA2-256 instead of SHA-1 or MD5, a proper PRNG, …). We are also particularly proud of the authentication process based on Stanford SRP protocol. And you need just one password (not two as in Passpack).
It’s free and completely anonymous.
The source code is freely available from Clipperz site for security review and the core crypto functions has been released under a BSD license.
Thanks,
Marco
Clipperz co-founder
David Bradley // Apr 26, 2007 at 6:47 pm
Hi Marco
Thanks for alerting us to this password manager. Is it also browser and OS independent?
Marco Barulli // Apr 26, 2007 at 11:44 pm
Clipperz runs smoothly with every OS and on Firefox, IE and Opera. Safari support coming very soon.
Thanks,
Marco
Francesco (PassPack) // Apr 27, 2007 at 1:18 am
@David
Thanks for this article. It’s nicely done.
@Marco
Let me reply to your comments on security, and if I oversimplify, please understand that I’m trying to make this post intelligible for non-crypto readers as well. So bear with me.
-1-
AES 128bit is suggested by US Federal Government for Secret documents. AES 256bit takes that further, but it is utterly useless for our scope. PassPack’s AES implementation supports 192bit and 256bit keys but we prefer to use 128bit. Why? Simple. In order to actually obtain a pure 256bit derived key, the user has to write a pass phrase of more then 50 characters. Have you ever met a user that does this? It’s pure theory.
Just to make the point. I played with the password strength tester that you recently implemented. It reaches it’s maximum strength reading at 128bit (not 256). Don’t worry, it’s not an oversight on your part, it’s just reasonable: there’s no need for more. [wink]
-2-
I agree that SHA-1, if used directly, is not so secure because the Chinese have found a way to reverse it. That’s why we don’t use SHA-1 directly, rather we combine it with xxTEA to create a hash. Here’s the formula:
SHA1Hash(xxTEAencrypt(text, key)).substring(0, 32)
That’s not reversible.
-3-
Tom Wu’s SRP technology is great, and so is PRNG, and generation of entropy is exciting, but honestly - it’s overkill.
In general, it’s important to remember that PassPack (and Clipperz) need to run in the browser. And browsers speak Javascript. And Javascript is slow. Every choice needs to be carefully weighed to find the right balance between security and speed. That doesn’t mean we choose speed over security - it means we choose balance.
Here’s an example. My PassPack account contains overs 200 entries, each with a User ID, Password, link, some tags and even notes. Yet, my 3 year old laptop can encrypt my entire pack and save it in 16 seconds (4 of which are added as “downtime” by PassPack itself to avoid stressing the browser). Clipperz employees 6 seconds to encrypt a single card. That’s a substantial difference.
-4-
One quick note on PassPack’s Packing Key - it’s what enables us to implement our anti-phishing welcome message. That’s just not possible with a single user/pass combination.
Security isn’t only about what algorithms you choose.
Ciao,
Francesco Sullo
PassPack Software Architect
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