Dashlane Premium Cracker

Since the article and a few posters in here talked about password managers, I just want to add my grain of salt (pun intended). I've been using Lastpass for a couple of years now, and recently switched to Dashlane, a new kid on the block. And since it hasn't been mentioned on this thread yet, here is a very small review for those interested: Pro's: - it's free (premium account available) - available on windows and mac, with android and iOS client (both of them free, but 'limited' if you don't have a premium account. A lock that can be picked with only a single precise key Not at all in theory.

Any hashing algorithm always takes a variable length string and outputs a fixed length string. You therefore have an infinite number of possible keys as inputs and a finite number of possible hashes as output (2^128 for MD5). By the pigeonhole principle, there must exist at least two keys (actually, an infinite number of keys) that have the same resulting hash. This is known as a collision.

In practice, collisions are difficult to find for good algorithms because of the computational complexity. However, both MD5 and SHA1 have weaknesses that make it easier to find collisions than simple brute forcing. This is the method by which the Flame malware was able to forge its own digital certificate to appear as a legit program signed by Microsoft. From a website developer perspective. Is not a good defence to implement a random hashing algorithm (in practice, a random pre-hash before running it through something known to be secure)? These hashing algorithms only work because they know what algorithm was used to encrypt them.

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I presume this is known because either its a common method (single-iteration MD5 etc) or the cracker has 1 known plaintext to start from (because they have an account in with the website they've hacked) and can then try lots of possible algorithms to see what produces their hash. But if you put a random step into it, it would be very hard to work out the hashing method, and you'd need to customise Hashcat etc to handle it. The possible permutations with a few lines of computer code (a couple or regex replacements could do wonders) would be practically infinite surely? I realise that a hacker with access to the system would reduce this to basically an obfuscation, but it would force the hacker to decompile a potentially large amount of computer code to find out the algorithm used. And to hacks that use an SQL injection to get a database dump wouldn't have access to this step. Note If I get access to the server, such that I can access the password hash table, I should be able to simply provide a password hash of my choosing this would be particularly easy if i were able to create a valid account on the target server i would then use the hash for my bogus account and substitute it into the hash for the target in the signon table.

When i'm done with my hack i switch the has back to what it was now: if the password has has been hashed with something selected at random from the target's account such as a key question -- or the date/time when the password was changed -- or both -- then this could be more difficult ~ but the thing that should come under discussion is not the hashing -- hashing should not even be needed if the password table is properly protected -- which clearly they are not. As we know SQL injection is a favorite method of getting at such database assets. ~ once I'm into the server though the mischief i can provide is pretty much unlimited. I could re-link the password authentication program and provide myself with a backdoor password that would unlock any account. ~~ security is like a balloon.

One pin-prick and pop! The best passwords are still those posited by XKCD () - four (two is next to worthless and three is not that good) random words strung together. The example given is 'correctbatteryhorsestaple' which you should NOT use, at it exists in most password dictionaries by now. Assuming the website is not rubbish with their hashing algorithm, adding the four-random word rule to your attempts to crack the password means you'll be looking at years rather than seconds for the password to fall.

Phrases might be ok, but they'll often appear in dictionaries and crackers that can create phrases are not too far away. Of course 16+ truly random characters is slightly harder to break, but it's also impossible to remember. Dashlane Premium Crackers. Now hold your horses here (sorry, I couldn't resist.) Although there's at max, something like 220K words in the English language (ref ). Most people's vocabulary is no where near that huge, so lets say they choose from a set of 10k. Mix in some archaic/less frequently used words in thine password (thou can take inspiration from Shakespeare or Chaucer) 2. Throw in some slang words 3.

Ye be speakin' like a pirate or other spelt-as-they-sound words (Hagrid, lithp thpeaking, siry wabbit catching Elmer Fudd, etc.) 4. Throw in words from more than one language (e.g. Corazon schadenfreude negentien ctyricet) 5. Use nonsense/made up words from media (e.g. ChronoGuard Wookie Gua'uld Lothlorien) 6.

Use words from mythology and folklaw (e.g. Seelie sidhe elysium valkyrie) 7. Use technical terms from a domain 8. Use foreign people's names (Piotr, Saoirse, etc.) or less frequent spellings of names (Rebekkah, etc.) Another thing to try is to write phonetically using a phonetic alphabet like ascii-ipa or sampa (e.g. T'Is 'Iz@ f@n'Etik p'asw3:d -- this is a phonetic password). I need to make some straightforward changes that require the Administrator password on my PC at work but IT support won't give the password to me (I'm sure that's because it's the same on every PC they support), nor will they fix the problem because iot involves 'coming out'.

Now I am cracking Administrator on my own PC at work because I need to fix it myself. I expect I'm not the only one in this stupid position.

How are you going to get the Administrator password hash, without Administrator access to those hashes? If you're in a windows Active Directory, your account is on the domain controller, if you're looking to crack the local machine's administrator password, you would be better off with NTPASSWD, which can reset the admin password to whatever-you-want As for the power requirements and general feasibility of Computronium, way to suck all the fun out of large numbers Time for bed. Nice article.

Good luck with finding a password manager. Keychain in OS-X was nice in that it integrated fairly well with most apps, but without the ability to sync across machines, and no way to use the db in another OS (even say, a virtualized windows install), it's out of the running. I hate to say it but as long as we're talking about websites here just using Chrome as your browser on all devices syncs your passwords (and open tabs and bookmarks) across them quite nicely, even encrypted with a user-supplied key if you want to. This is one point where Apple just missed an opportunity: Apple should have not only supplied a Keychain app in iOS, Apple also should have ported Safari over to Android (and Linux) and integrate Keychain syncing with it. There's nothing that discourages using secure (unique, complex, long) passwords more than having no way to safe, sync and use them in a secure and convenient way.

Using passwords consisting of strings of random 16 characters is easy if you have this and almost impossible if you haven't. If you're not using a password manager such as 1Password or Last Pass, you should start.

I've been trailling Last Pass and it's biggest issue is that there is zero integration with mobile apps. If I change my eBay password on the website to something super secure, when I want to log in on the app, I have to log into my password manager, copy the password and then paste it into the eBay app. Android and iOS need to allow password managers to integrate into apps in the same way that they do on your browser. From a website developer perspective.

Is not a good defence to implement a random hashing algorithm (in practice, a random pre-hash before running it through something known to be secure)? These hashing algorithms only work because they know what algorithm was used to encrypt them. I presume this is known because either its a common method (single-iteration MD5 etc) or the cracker has 1 known plaintext to start from (because they have an account in with the website they've hacked) and can then try lots of possible algorithms to see what produces their hash. But if you put a random step into it, it would be very hard to work out the hashing method, and you'd need to customise Hashcat etc to handle it. The possible permutations with a few lines of computer code (a couple or regex replacements could do wonders) would be practically infinite surely?

I realise that a hacker with access to the system would reduce this to basically an obfuscation, but it would force the hacker to decompile a potentially large amount of computer code to find out the algorithm used. And to hacks that use an SQL injection to get a database dump wouldn't have access to this step. No, its a very bad idea: a) how do you know an error in your implementation doesn't reduce the effective security in the 1st place? Especially if you are considering a non-cryptographic hash for that role. B) if you are assuming that the attacker cannot access your code (or wouldn't be bothered to decompile it) you may as well insert a large (64bit+) random application specific prefix salt into the alogerithm i.e. H = PDKDF2(PW, AppSalt UserSalt) where UserSalt would be stored with the hash and AppSalt in the code (potentially obfuscated). It will achieve what you want without the need to introduce potentially risky password manipulations.

If you use LastPass, go to settings and enable two-factor authentication (with Google Authenticator and / or Yubikey). Do the same for Google, Dropbox etc accounts that use TOTP/HOTP aka Google Authenticator. Then download the Authenticator app from Google Play (don't know about iDevices). This makes it much harder for a script kiddie in Nigeria to login to your account even if they crack your password. Sites generally require the use of Authenticator in addition to password when logging in from a previously unused computer or browser. I use LastPass for most website accounts, but not any accounts that can be used to recover passwords (Gmail etc), or bank, etc sites. The rest are in a GPG-encrypted orgmode file on Dropbox.

Half of the passphrase for that is stored on a Yubikey, the other half is rattling around in my brain. It's easy to tell you guys are all monolingual anglophones. I don't think anybody mentioned mixing languages in your passphrases. Just grab some text, go to Google Translate and translate it to Estonian or Maltese or Klingon. Passwords are pointless, pass phrases are a bit more secure. If only more sites would allow greater than 14 digits. Also: New NSA facility out in Utah will make this a moot point.

The entire thing is dedicated to storing and cracking encrypted data for as long as it takes, including password-protected things and encrypted emails. That facility WILL be able to do this. FFS, they even have their own 65 mega-watt generating station, just for the buildings that are housing the systems doing the storage and decryption. A lock that can be picked with only a single precise key Not at all in theory. Any hashing algorithm always takes a variable length string and outputs a fixed length string.

You therefore have an infinite number of possible keys as inputs and a finite number of possible hashes as output (2^128 for MD5). By the pigeonhole principle, there must exist at least two keys (actually, an infinite number of keys) that have the same resulting hash. This is known as a collision. Yes, although you need more than simply an arbitrary collision; you need a collision that can actually be used (so has to fit into the length and character set constraints that the API imposes).

So generally, the existence of other collisions doesn't really help much. In practice, collisions are difficult to find for good algorithms because of the computational complexity. However, both MD5 and SHA1 have weaknesses that make it easier to find collisions than simple brute forcing. This is the method by which the Flame malware was able to forge its own digital certificate to appear as a legit program signed by Microsoft. Not for arbitrary hashes they don't. The MD5 weakness requires the use of two known, related strings; it's not a general-purpose 'here's a hash code: create a string that hashes to it'.

Can anyone suggest a good way to evaluate the strength of a password against the tables and rules? Obviously, I can search for a password in the RockYou list but I'd also like to check it against rules based on that list. The hashing algorithm is irrelevant if the password you're using is on the list. Yes, I could create an MD5 has of what I'm looking to check. However, I'm not about to type my password into an online MD5 generator (duh!) and I didn't see anything I trusted to calculate one nor do I know of a built-in Windows command to do it (sadly no UNIX available to me). I like the idea of using an irrational number - or part thereof to create passwords. I doubt 585198062 is on a table anywhere (decimal places 2-10 of sqrt[491]).

I mean, really, when do I not have a calculator on hand or at least on my smartphone? I wonder if someday storage will be so cheap it'll cost less to store every possible password and their hash than to buy the processing power to crack them. I think it already might be the case. You can store all 7-digit long password formed using the basic latin alphabet and numbers, sorted by hash, in a 22TB file, which would cost about US$1400. With 8 digits, the file size would be 1.5PB, or US$70k.

Since it'd only take the time to move the reading head of the HDD to the hash address to obtain the password from such a file, you could crack a password in milliseconds, with a one-time investiment. Although 70 grand is a huge amount of money for script kiddies, it's nothing to a corporation. People need to open their eyes.

No password under 10 digits should be allowed in any system nowadays. Thanks again for raising awareness and reminding us to change our passwords. Changed my gmail, facebook, amazon, paypal and banking sites passwords. (It's been 8 years since I changed my gmail password, which is to say it was still my original password.) Not entirely happy that one of the banks only allows a 12 char. Max password. There are huge financial institutions that have horrible password policies. One very large one only allows 8 digit passwords!

Yes, only digits. Another major retirement/financial group has a 10 character max!

And both of these are multi-billion dollar firms that are commonplace. I have written Dan about bringing these firms to light, since both firms responded with a generic 'Our site is secure and we take security seriously' response, but he never responded to my request. These companies need to be called out in the media or they will never change. Thankfully Bank of America updated its site (a long while ago). It started with an 8 character max with no special characters. Following previous Ars coverage of passwords a year or so ago, I started using a password manager.

I was a bit untrusting of online password managers at the time and following the advice of another Ars commenter I set up my own cloud-synced KeePass implementation. You just need to pick a cloud file service of your choice that offers a sync client (I set mine up with DropBox) and put your database file in a local sync'ed folder. If you are concerned about the security of the database file should your cloud file service be compromised, then you can add an additional layer of security by using a key file in combination with the master password, but store that file locally and just copy it manually to any system that you want to access your database on. That way, the database stays synchronized but its effectively useless on its own, even if your master password brute forced. Someone mentioned they were worried about the security of 3rd party ports.

As far as I know, they all offer source code with the binary. So if you are concerned, just inspect it and compile it yourself. Admittedly, this is less true for the mobile implementations.

I strongly recommend to anyone that I have the discussion with that they use a password manager. Self Downloading Mods. With as many online identities as we have to manage, you either end up using a lot of unique, weak passwords or one or two strong password for everything if you try to remember them on your own. Neither of which is desirable.

The ignorance of, and resistance to, password managers in these posts is mind boggling to me. Or maybe it's just a resistance to admitting how bad our memories are..Or maybe I'm just dumb. But I can't risk not having secure passwords, and no way to remember 300+ unique strong passwords will ever exist, so a password manager is granted and, to me, the only discussion should be 'which one?' I actually could relate completely to every bit of this article until it mentioned the reluctance to use a password manager as well. Pick one and move on. Pick another one a month later and decide which of the two you like better, rinse and repeat until you're content if you have to, but take human memory out of the equation (save for the master pw to the pw database, which ideally should only be half of a two-factor authentication.).

I like the idea of using an irrational number - or part thereof to create passwords. I doubt 585198062 is on a table anywhere (decimal places 2-10 of sqrt[491]). I mean, really, when do I not have a calculator on hand or at least on my smartphone? Good luck plugging that into any password request that has form rules. Use number ->alphabet for the first 5.

Capitalize the 5th letter. That should pass any system. I now need to remember 4 things (the number, which digits, which are letters and which is a capital).

I could easily write those down on a card in my wallet since nobody would know what to do with the info. Next time one of my mouth breathing users whine about mandatory password lengths, complexities and expiry times, Im going to punch the. Point them to this article. But this article doesn't remotely make the point you are trying to uh.

Perhaps you should try reading it again more closely? How about we go look up articles about how frequent password changes leads to security issues because it leads people to choosing the weakest possible passwords and often write them down thereby making the purpose of changing them useless?