32,484 reputation
23584
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location Rensselaer, NY
age 31
visits member for 2 years, 11 months
seen 10 hours ago

Jul
21
comment Can you protect corporate email on personal phones without the option of wiping all personal data?
Yes, that is now an option as is the exchange native app. Both are new since my original post I believe, but thanks for posting an update.
Jul
1
comment Are photographs of fingerprints a security risk?
Finally, if you have physical access, there are far simpler and cheaper ways to access a fingerprint than the mentioned photographic technique, so it isn't really any additional risk.
Jul
1
comment Are photographs of fingerprints a security risk?
This answer is accurate that high resolution images will allow for duplication of a fingerprint, but I think it misses the core point of the question. HD cameras (which aren't actually that high quality) aren't going to allow for reproducing a fingerprint remotely, or even with it as the intent. Yes, a high resolution still camera can capture high enough quality images, but without physical proximity, people are not going to post purpose taken high quality images of people's fingers online generally, so there is a lack of suitable public material in most cases.
Jul
1
comment Are photographs of fingerprints a security risk?
@GroundZero HD cameras don't pose a risk, high quality photos at close range do. There is a major difference between the two. I simply pointed out that other approaches are more practical as a highlight of the fact that pointing out high resolution photos as an alternative to HD video doesn't really matter as other options are cheaper and easier if you have proximity. My read of the original question was more that it dealt with publicly available imagery, which is not going to be a specifically high res image of a finger.
Jul
1
comment Are photographs of fingerprints a security risk?
@GroundZero - yes, however if you look at the photos they are using, they are close up photos. Certainly photos are more likely to allow for this than video, but the original though of video isn't viable, and it would take some amount of equipment and effort to capture the photographs of a subject's fingers. It would be far easier and cheaper to simply dust something they touched.
May
15
comment Security of several files all using same password/key (7zip, AES256)
More specifically, in a real worst case scenario, the chaining mode won't matter. Chaining only means that the current state depends on the previous iterations of the algorithm. If the first phrase of the encryption is able to be broken, then any subsequent ones could still be broken though and the IV is going to be known since the IV is not protected data. It is the job of the algorithm to ensure that you can't figure out the key from a set of plaintext and cipher text.
May
15
comment Security of several files all using same password/key (7zip, AES256)
@Ángel- um, no... what you describe is a KPA (known plaintext attack). There currently isn't any major KPA against AES (at least not that I've heard of). There are stronger and weaker block modes for other attacks, but you are talking specifically about KPAs and drastically failing KPAs, of which there are none for AES currently.
May
14
comment Security of several files all using same password/key (7zip, AES256)
@angle - If knowing the plaintext and ciphertext gives away the key, your algorithm is SERIOUSLY broken. Note that I specifically indicated that my answer is only relevant if the key selection and encryption algorithm is strong.
Apr
11
comment Now that CloudFlare offers potentially-insecure free SSL to all users, would a new HTTP header be useful?
@Rushyo - are you saying that Comodo actually gave cloudflare access to their root pki keys? That would be very bad and would be worth stopping trusting them. (Other CAs have been delisted for compromise of the private keys.) Much more likely would be that they signed a code signing key for Cloudflare and you could simply decert the specific delegated key to break chain of trust. IT wouldn't block 90% of the internet, it would only break the certs that Cloudflare generates.
Apr
10
comment Now that CloudFlare offers potentially-insecure free SSL to all users, would a new HTTP header be useful?
@Rushyo - in the case of a load balancer, it should be load balancing across either a physically secure network or should be re-encrypting to the end point. The problem is only when you label something as a secure connection that is not. Providing an SSL gateway to a non-encrypted site across the open internet is a very different thing from providing a load balancer in a secure data center that acts as the SSL head.
Feb
22
comment Create certificate without private key with OpenSSL
Can't you use the smart card to sign the CSR? Simply produce the unsigned CSR and then submit it to the card for signing. Signing is typically a feature of a smart card since without being able to sign, it can't prove to anything that it has the private key.
Feb
15
comment Why don't mobile operators blacklist stolen phones using their IMEI?
Fair enough, but a permanent fix still isn't a concern for a thief. They just want to get the cash. They are almost never the end user, because they know having stolen property is a bad idea.
Feb
15
comment Why don't mobile operators blacklist stolen phones using their IMEI?
I'm not sure if it is possible to clone with a jtag or similar device against the hardware directly, but a thief doesn't care if it works long term. They care if they can pawn it off on someone before it breaks.
Feb
14
comment Can you say that since one time pad encryption is unbreakable, it is the best if used properly?
@chao it is worth pointing out that using crypto all the time doesn't hide that you sent a message, it just hides if it is interesting. Also, otp isn't limited to the Internet so it could be used through covert channels that are harder to track to you.
Feb
14
comment Why would an attacker try to guess random email usernames on a small domain?
@skaperen Actually there is zero chance because they try the same series of passwords and are blocked before they ever get to a valid password since the initial guesses don't meet complexity requirements.
Feb
14
comment Can you say that since one time pad encryption is unbreakable, it is the best if used properly?
@Hopelessn00b - Ok, re-reading your comment from earlier, I think I get what you are saying about OTP not maintaining perfect information security (sorry, it is 2am here). It does leak that you may have sent a message (but you may not have). But that in no way aids in breaking the cryptography itself. My statement is very clearly about being "impossible to break", not "impossible to make any observation about your action". There is no information leaked which is useful in breaking the cryptographic protection of the message.
Jan
4
comment Two-factor authentication Without Mobile Phone
@tepples that is why account name and login should not be the same if you can avoid it.
Dec
16
comment Is it possible to upgrade the SSL version of a connection from the server's side only?
Disabling SSL3.0 on the server should force it to use a non-default option (or the connection will just fail). It is probably your best bet for forcing it though.
Dec
13
comment SQL Injection solutions
@Scarl the safest is to parameterize your SQL, but if you can't do that for some reason, any input sent from the user's computer that is used in creating a SQL statement must be filtered.
Dec
11
comment Port Scan Detected and Blocked! - Bitdefender 2014
@user54791 that's assuming that the router is actually a NAT router and not just a basic network router. Depending on the type of router, it may just be putting them on the same network as his cable modem and his cable modem may just be handing direct IPs to each computer on the network.