@thisjosh i have several off-site servers that I use, and the system that i'm installing SSH on holds the master keys to that server (i.e. access to an admin account). That's what I mean by access to the servers.
@Iszi the value of the data is somewhere between "Important" and "Highly Secret"
@TheEvilPhoenix The general wisdom is to use key authentication. This particular machine is highly sensative as you say.
My opinion is that you should create a separate account to ssh into the machine that the one you normally use locally.
You have some good risk mitigation going on, but there is some really valueable stuff there. In part the security of all your server machines are dependent on this machine.
Keys are the common wisdom because they are less prone to information leakage...
I was initially thinking that it would be harder to automate an ssh attack using key rather than passwords, but I'm not so sure. I think it takes away dictionary attacks, becuase the keys are random.
@Iszi I agree with you that as more and more reasonable answers are rejected, it is more and more NARQ. I guess I was just more in a mode of trying to improve it rather than putting the ball back in his court by closing it. Not easy to choose some times....
@thisjosh Note that while the key is random, the passphrase it typically anything but....
@TheEvilPhoenix: SSH public key authn is indeed often recommended. But I was alarmed to read the other day (and put in one of my answers) that there is no iteration in the password used to derive a key to encrypt the SSH private key. So that forces you to use a REALLY long hard password. I looked at the openssh code a bit but not enough to tease it all out, and there is at least one place where they do 1000 reps of hashing, so I'm still looking for more info there....
I meant there is no iteration in the derivation from the password of the key used to encrypt the SSH private key. I.e. it is not something like PBKDF2...
@thisjosh Yes, minimum impact on observed image. It must be useable for clients. And semi-destructive a we don't want the JPEG compression to remove it. But indeed all modification should destroy the mark (because if you modify a proof, it's not a proof anymore)
With the News of The World Phone Hacking scandal spreading globally amidst allegations that as well as celebrities, victims of September 11 and other major events in the news have had their phones hacked into.
With this in mind, many people are wondering: How can I stop my phone being hacked?
T...
The News International phone hacking scandal is a controversy involving the News of the World, a now-defunct (but at the time the scandal broke, best-selling) British tabloid newspaper published by News Group Newspapers of News International (a subsidiary of Rupert Murdoch's News Corporation), and the allegations that individuals working for the newspaper engaged in phone hacking. It was especially notable as the story broke in the midst of an attempted takeover of British Sky Broadcasting by News Corporation.
Public reaction to the scandal in Britain was swift. On 6 July, 2011 Briti...
How does changing your password every 90 days increase security? This has been one of our more popular posts, with discussion on the reasons for password expiration: To mitigate the problems that would occur if an attacker acquired the password hashes of your system It prevents people who use the same password for everything from [...]
I have been working on a program that uses MS Access and ODBC to connect to an SQL server, one of the requirements was that the user need not know the password for the connection to the SQL server so I checked the 'Save Password' check box when linking my SQL tables.
Does anyone know where the p...
sunshine just gone, but I have just had a lovely picnic in the gardens with my wife, kids and my brother (who is a bit twitchy as his wife was due to give birth yesterday)
And I'm presuming that all means that the family is near by. That's really good. My mother-in-law came down to stay with us for the first week or so. Quite helpful.
mmm - coffee. A girl in Prince's Street Garden gave me a bottle of Lipton Peach Ice Tea, and no matter how much I look at it I can't make myself believe it will taste nice. So I'm off for coffee.
yeah - I can drink the normal stuff in Dubai or Vegas or places where the key is to keep hydrated, but in a normal situation (ie Scotland - where it rains a wee bit) I prefer my water to be a transport medium for ethanol
oh, and as QOTW 1 blog post is out, there is a question on meta for QOTW 2
For QOTW #2, scheduled for publishing to the Security Stack Exchange Blog on 22 July, please post as Answers, and vote for your favorite question on Security Stackexchange.
Please post any question that you feel is of worth and the reason why. Try not to promote your own questions or answers for...
@RebeccaChernoff Is there some way to configure the Twitter bot so that it gives blog posts a certain hashtag, or something else that will make it more easily distinguishable from the regular random question postings?
@RoryAlsop - It's posted by @stacksecurity, but the only real distinction between them and the regular posts is, incidentally, the absence of a hashtag.
Question of the Week #1 – How does changing your password every 90 days increase security? http://bit.ly/q7yVcR
@RoryAlsop wait until i hit my first break of the day... during that time, i run to the nearest coffee shop and usually ingest a triple-espresso drink very quickly o.o
and then sometimes a second (THEN the day gets fun :P)
question for you guys: how efficient is SpamCop at finding and blocking spam?
hahahahaha - I had to give up the serious caffeine habit I developed while working for Siemens-Nixdorf in Munich. There, even the coffee grinder was within arm's reach without moving my chair. Fatal!
@TheEvilPhoenix It seems not too bad, although in recent times I have switched over entirely to the google platform and I get almost no spam. Maybe one or two a week now
but I don't know whether google just use their own internal system or whether they also use SpamCop et al
@RoryAlsop Lipton Peach Ice Tea does not taste like tea at all. On the bright side, it does not taste like bad tea. Only a kind-of-peachy water, like an American beer with sugar.
@ScottPack At CHES'2001 ("Cryptographic Hardware and Embedded Systems", a scientific conference), located in Worcester (Massachussets), the coffee breaks featured free glasses of Sam Adams (lots of them)
As this question on voicemail protection got answers veering more to protecting the mobile phone, I thought I should add a specific question on this topic.
So, that simple - how can I protect my mobile phone from attack.
There is a wide range of attacks including the THC femtocell attack so all...
@RoryAlsop Perhaps I should have been more clear. This is still way too broad, broader than "how can I protect my desktop computer from attacks", since the phone ecosystem is more diverse than desktops.
We want separate questions for different platforms, and I suspect that several have already been covered.
@nealmcb do you think the original one still works? the voicemail one? More than happy to split out the mobile phone one into Android, Apple, Symbian?, Windows Mobile (meh)
@RoryAlsop I think the voicemail questions is a good start, in particular because I don't recall it being covered before, and such systems are likely to have more shared vulnerabilities
If we learn of specific vulnerabilities of particular sorts of platforms in the voicemail ecosystem we can get more specific in further questions
@RoryAlsop Nah - I salute you for getting the ball rolling - I'm more prone to not asking at all until I think I know what to ask, which often means not at all and then we make no progress :)
In Firefox 5. See screenshot below. Tested in Safe Mode as well, with same result.
Looking at the Blog Overflow homepage, it seems we're the only blog with a recent post title that long.
in the first block, one searches for messages m such that h(m) and h(m xor d1) differ by only a few bits in specific positions
i.e. h(m) xor h(m xor d1) = d2
and then for another block m' such that hashing m' beginning with state h(m), and m' xor d3 from state h(m xor d1), end up with the same value
so it is a kind of leakage
only with a quite low probability (its a 1 in a million chance)
For a properly secure hash function you cannot have the kind of leak you talk about, because if there is such a leak, then this looks like a good way to speed up collision attacks, and therefore the hash function is not secure.
@Iszi FFox 4 (Windows) FFox 5 (Ubuntu) Chromium (Ubuntu) Google Chrome (Ubuntu), FFox ones look like the all-on-one-line overlap one, Chromium and Chrome look like the one with half-overlap
@thisjosh If you're talking about in chat, it only happens when that person posts enough consecutive lines to have room for a larger gravatar and their username and their rep.
I always enjoyed working in a math department. The guys were a bit fun to hang out with once they got out of the undergrad program. Signing up for things like MATH 705 - Counting
What in the Wide, Wide World of Sports is Going On Here?
TL;DR -- put images and links in the answers. If they get voted up enough, they will appear on the main site as community promotion ads.
But whyyyyyyy?
This is a method for the community to control what gets promoted to visitors on the s...
I have also just fixed the length of the title - shouldn't wrap around any more
@RebeccaChernoff - community promotion ad for the Blog sounds like a good idea. What I might do is wait until @Jin has sorted the theme, and then I'll create a banner ad for it
I was just thinking that the Blog is ment to draw people to the site, so you want as many links to draw people in as possible, and its also polite to site your sources
The only challenge with the top line system message feature is it doesn't give much space, and is only valid up to 48 hours so you kind of need to keep changing it for whatever is new etc
@RoryAlsop, it is fine as is, but I might suggest actually doing something a bit different visually. You want people to notice it, not think it is the same as the other ad.
@Ninefingers I have 2/3rd of the required upvotes, but I also need to get upvotes on a 100 more "cryptography" answers. I do not think there are enough crypto questions yet in security.SE, and the new crypto.SE might drain newer crypto questions
we'll see
and right now is time for me to stop goofing around and start some serious non-working for the week-end