If you have the right rainbow tables. Rainbow tables get more expensive for each character you add to the length of the password/passphrase, for any given character set - on the close order of (x^y plus a tiny bit of overhead), where x is the number of characters in your character set, and y is the length of the password/passphrase.
Kurt On Thu, Feb 10, 2011 at 13:22, Don Ely <[email protected]> wrote: > At roughly 3 characters per minute, you can extrapolate that out to 20 > seconds per extra character.... :) > > On Thu, Feb 10, 2011 at 1:13 PM, Jonathan <[email protected]> wrote: >> >> And how many additional minutes does each additional character above 15 >> add? >> >> Jonathan - Thumb typed from my HTC Droid Incredible (and yes, it really >> is) on the Verizon network. >> >> On Feb 10, 2011 4:09 PM, "Michael B. Smith" <[email protected]> wrote: >> > Anything under 15 characters I can crack in under 5 minutes. >> > >> > Anything. >> > >> > Regards, >> > >> > Michael B. Smith >> > Consultant and Exchange MVP >> > http://TheEssentialExchange.com >> > >> > From: MMF [mailto:[email protected]] >> > Sent: Thursday, February 10, 2011 4:05 PM >> > To: NT System Admin Issues >> > Subject: RE: IPhone attack reveals passwords in six minutes >> > >> > How about a nursery rhyme but use the first letter of each word. >> > Example: Hickory Dickery Dock The Mouse Ran Up The Clock would be: >> > hddtmrutc. >> > >> > Murray >> > >> > ________________________________ >> > From: William Robbins [mailto:[email protected]] >> > Sent: Thursday, February 10, 2011 12:52 PM >> > To: NT System Admin Issues >> > Subject: Re: IPhone attack reveals passwords in six minutes >> > +1 I use song lyrics also. >> > >> > - WJR >> > >> > On Thu, Feb 10, 2011 at 12:49, David Lum >> > <[email protected]<mailto:[email protected]>> wrote: >> > One method is to take acronyms from your favorite hobby and string them >> > together Example: NetBEUI CPU is 45GHz 14Kbps >> > NetBEUICPUis45GHz14Kbps. 25 characters, upper and lower case and I'm >> > going to guess random enough. Surely acronym's are different when it comes >> > to a dictionary attack? Need to change it? Flip the order of the acronyms. >> > >> > Personally I use a passphrase with correct punctuation - it gives upper >> > case, lower case, and special character. These becomes frustrating when you >> > go to a website that gives you something dumb like 12character maximum, in >> > which case use the hobby acronym's. >> > >> > My $0.02 >> > Dave >> > >> > From: Don Ely [mailto:[email protected]<mailto:[email protected]>] >> > Sent: Thursday, February 10, 2011 10:29 AM >> > >> > To: NT System Admin Issues >> > Subject: Re: IPhone attack reveals passwords in six minutes >> > >> > I must not be human... Most of my high security accounts have passwords >> > of 20+ random characters and I have them memorized... >> > On Thu, Feb 10, 2011 at 10:25 AM, Ben Scott >> > <[email protected]<mailto:[email protected]>> wrote: >> > On Thu, Feb 10, 2011 at 12:31 PM, Matthew W. Ross >> > <[email protected]<mailto:[email protected]>> wrote: >> >>> If data is encrypted with strong crypto, and that crypto's secret >> >>> key is not stored on the device, then that data can generally be >> >>> considered safe even if the device is stolen. >> >>> >> >>> In English, that means if the security depends on a strong password >> >>> the user must enter (and not on some magic the manufacturer has >> >>> "hidden" inside the device), the password-protected data is safe. >> >> >> >> ... Isn't that only partially true? I mean, if the encrypted data is >> >> stolen, >> >> isn't it reasonable to believe it can be cracked given enough time/cpu >> >> power? >> > You're basically correct. >> > >> > Given good algorithms and implementations, the strength of your >> > security depends on the strength of the key. If the password is an >> > English word, then yah, it's going to be straightforward to crack in >> > minutes or hours with a dictionary attack. If it's a a combination of >> > words and other characters, it's harder, but still within reason for >> > days, weeks, or months. Once you go to truly random characters, it's >> > dependent on the length. But even 10 characters might be crackable in >> > several years given commercially available technology. (I'm not up on >> > current predictions, so numbers may be off for times.) >> > >> > A truly random 256-bit symmetric key could theoretically be cracked >> > given enough time, but time to brute-force (given known technology) is >> > generally given in billions of years. It has been theorized that new >> > technology (especially "quantum computing") could drastically cut into >> > that, but it remains to be seen if such things are actually possible >> > or not. >> > >> > But 256 bits is a lot. Printable ASCII is roughly 96 characters. >> > That fits in roughly six and a half bits. So your passcode would need >> > to be around 40 characters long, and *completely* random (no words or >> > patterns), for it to be in that neighborhood. It's not realistic to >> > expect humans to do that. >> > >> > -- Ben >> > >> > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ >> > ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ >> > >> > --- >> > To manage subscriptions click here: >> > http://lyris.sunbelt-software.com/read/my_forums/ >> > or send an email to >> > [email protected]<mailto:[email protected]> >> > with the body: unsubscribe ntsysadmin >> > >> > >> > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ >> > ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ >> > >> > --- >> > To manage subscriptions click here: >> > http://lyris.sunbelt-software.com/read/my_forums/ >> > or send an email to >> > [email protected]<mailto:[email protected]> >> > with the body: unsubscribe ntsysadmin >> > >> > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ >> > ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ >> > >> > --- >> > To manage subscriptions click here: >> > http://lyris.sunbelt-software.com/read/my_forums/ >> > or send an email to >> > [email protected]<mailto:[email protected]> >> > with the body: unsubscribe ntsysadmin >> > >> > >> > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ >> > ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ >> > >> > --- >> > To manage subscriptions click here: >> > http://lyris.sunbelt-software.com/read/my_forums/ >> > or send an email to >> > [email protected]<mailto:[email protected]> >> > with the body: unsubscribe ntsysadmin >> > >> > ________________________________ >> > >> > No virus found in this message. >> > Checked by AVG - www.avg.com<http://www.avg.com> >> > Version: 10.0.1204 / Virus Database: 1435/3434 - Release Date: 02/10/11 >> > >> > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ >> > ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ >> > >> > --- >> > To manage subscriptions click here: >> > http://lyris.sunbelt-software.com/read/my_forums/ >> > or send an email to >> > [email protected]<mailto:[email protected]> >> > with the body: unsubscribe ntsysadmin >> > >> > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ >> > ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ >> > >> > --- >> > To manage subscriptions click here: >> > http://lyris.sunbelt-software.com/read/my_forums/ >> > or send an email to [email protected] >> > with the body: unsubscribe ntsysadmin >> >> ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ >> ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ >> >> --- >> To manage subscriptions click here: >> http://lyris.sunbelt-software.com/read/my_forums/ >> or send an email to [email protected] >> with the body: unsubscribe ntsysadmin > > ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ > ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ > > --- > To manage subscriptions click here: > http://lyris.sunbelt-software.com/read/my_forums/ > or send an email to [email protected] > with the body: unsubscribe ntsysadmin ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~ --- To manage subscriptions click here: http://lyris.sunbelt-software.com/read/my_forums/ or send an email to [email protected] with the body: unsubscribe ntsysadmin
