October 27, 2011 2 Comments
These WIRED article described an interesting application of the side channel idea to key-log your typing by sensing mechanical vibrations.
Cryptography, Information Theory and Codes
April 22, 2011 1 Comment
The fact that most of us carry (voluntarily) a tracking device should not be news for anybody. I guess the news-worthy part is that somebody expossed what Apple and Google where doing. I am not sure it is illegal, have you checked the small font bits of the contract you signed? Me neither.
Believe me, that Apple and Google know where you are and where you have been is not the biggest of our problems with privacy as discussed in here.
(h/t) Raymond who sent this link
March 22, 2011 8 Comments
To be continued…..
March 7, 2011 1 Comment
The fingerprinting of a computer using data accessible or generated by software is subjected to a Replay attack or could be easily disrupted by malware. This method should not be used to authenticate the machine.
In order to defeat Replay attacks, the fingerprinting algorithm needs to generate a one time string, based on some unique property of the hardware and that can be used by the verifier to check the identity of the computer.
One example of such technology is the Intel IPT (Identity Protection Technology) that works by generating a unique 6 digit number every 30 seconds. This number is generated by a section of the chip that is inaccessible to the Operating system and holds some secret key shared with the validator/server. Once a particular processor is linked to a server, the server will be able to identify the CPU and validate the computer. Of course this does not imply user authentication and the intended use of this technology is as an additional factor on a multi-factor authentication scheme.
A Public Key infrastructure (Certificate Authority) is still needed to defeat the Man in the Middle attack.
Technologies that can identify hardware to the chip level are being developed to prevent counterfeiting. These are based on the PUF (Physically Unclonable Functions) that use physical variations of the circuit to extract certain parameters that are unique to each chip and cannot be reproduced nor manipulated without physically tampering with the circuit.
Power-up of a SRAM as a source of Entropy and Identification
Secure Processors, the ultimate battlefield
A PUF Design for Secure FPGA-Based Embedded Systems
March 3, 2011 4 Comments
What can go wrong with the government dictating how much companies can charge for bandwidth on the internet?
They certainly have a very good track record regulating it.
Regulators are congenitally incapable of grasping that they create more problems than they solve
This is why I am always wary of attempts at regulation.
February 27, 2011 1 Comment
Authentication is about the only big open problem in the practice of internet security. The existing encryption and hashing algorithms as well as the key generation/management protocols offer a high degree of security, barring programming/implementation errors.
Authentication technologies face serious challenges mainly because identity is difficult to establish with a 100% certainty even using physical characteristics, i.e., signatures and credentials can be forged, the physical appearance of people can be manipulated, etc.
Read more of this post
February 21, 2011 3 Comments
for my prediction to become a reality.
PC world reported on Feb 18 that a bunch of websites, only 84,000, were taken down “accidentally” by the ICE.
I have zero sympathy for people who uses the web to steal or commit morally reprehensible acts, however, if I can anticipate the heavy damage that a government agency with the power to shut down internet domains can unleash on hardworking and honest people,you cannot convince me that the legislators cannot figure this was bound to happen. Obviously they don’t care about the consequences of their grandstanding have for the rest of us mortals. And at the end of the day, shutting down websites doesn’t stop the traffic of child pornography or stolen intellectual property, it is just a nuisance for the bad guys that now need to go and setup another channel.
The danger for the rest of us is this, if we trust the government, any government, with the switch to the Internet, how long before the shutting down of domains is used as a way to silence dissent?
Oh wait! It did already happened? That was another prediction that turned to be right!
Check this Hall of Shame page at the EFF
February 20, 2011 Leave a comment
While the FBI was accused to set a backdoor to OpenBSD, the NSA clears the record on DES.
There are many stories about sneaking sophisticated chunks of code that make perfectly good encryption system to leak information. Something like this is extremely difficult to do without nobody noticing it and I think that it must be considered as a lot of unnecessary trouble for the guys that rather will nicely ask for the keys to your front door.
February 19, 2011 2 Comments
SANS Institute has the best article I’ve seen on the issue of IPv4 address space exhaustion. A good read, including the comments.
Today, IANA announced that it had handed out two more /8 IPv4 assignments to APNIC. As a result, IANA is down to 5 /8s, triggering its special policy to hand out one address to each regional registrar (RIR). The 5 RIRs are AFRNIC (Africa), APNIC (Asia Pacific), ARIN (North America), LACNIC (Latin