Forgot your password?
typodupeerror

Comment: Tit for tat (Score 3, Insightful) 147

They seem to learn fast, also they have a lot of good engineers. We should expect some kind of response to Stuxnet and I guess we have established by Stuxnet that electronic warfare is OK for countries to do against each other.

It is going to be much harder to stomach the day some Air-force guy is taken out by a drone attach in Virginia with a missile to his car as he is delivering his children to Kindergarten.

Comment: US trying to make allies chose to use US made gear (Score 2) 76

by Sigurd_Fafnersbane (#46253995) Attached to: S. Korea Diverts Network From Huawei Networks
According to Snowden, NSA use vulnerabilities in both Huawei, Cisco and other manufacturers gear to spy on traffic but if the vulnerabilities in Cisco, Juniper and others are planted there by NSA they might suspect that other parties have bigger difficulties spying on Cisco gear. Most likely though it is more a question on wanting to favour American industry like when NSA did industrial espionage against Brazilian, German or other countries companies and share data with US companies.

+ - Join the efforts of a manned mission to Jovian moon Europa->

Submitted by Kristian vonBengtson
Kristian vonBengtson (3027633) writes "Objective Europa aims to send human beings to Jupiter’s icy moon, Europa, on a one way mission in search of extraterrestrial life while expanding the borders of exploration and knowledge for all mankind.

The starting point of Objective Europa is purely theoretical (Phase I) but will move into more advanced phases including prototyping, technology try-outs, and eventually a crewed launch.

Objective Europa is a crowd-researched project made up of an international team of volunteers. Many people from a wide range of backgrounds have already joined and become a vital part of the mission. We encourage you to join us and help in any area you are interested in. You do not have to be a rocket scientist or astrobiologist; site maintenance, social media control, conference arrangement, lobbying (and much more) are equally important tasks.

The destination for this crewed mission is Jupiter’s sixth closest moon, Europa. Its deep ocean and active geology provide a solid platform for extraterrestrial life, making Europa one of the most enticing locations to explore in the solar system. The 600 day flight required to reach Europa is manageable with today’s technology, and the many challenges of such a mission pose a perfect starting point for new research and innovative thinking.

If you find ice and water more appealing than Martian deserts, we invite you to join our project and help us take the first steps towards exploring Europa.
http://www.objective-europa.com/"

Link to Original Source

Comment: Re:Time for an entropy server? (Score 1) 566

by Sigurd_Fafnersbane (#44811217) Attached to: Linus Responds To RdRand Petition With Scorn
I think you should save your money even though it is a noble idea. Sources of randomness are not that hard to come by if you are on a physical machine and without having read how the linux kernel is doing it I assume it is rather bullet proof. If you only return hashed versions of your pool of randomness and add to the pool at every call it will become impossible to predict what the next output will be without knowing the content of the pool and the random elements you add to your pool. If you at each call to the random() function add samples from the sound card, hash the pool, add free disk space, hash the pool, add cpu temperature, hash the pool, add content of memory location pointed to by lowest 32 bits of the pool, hash the pool. If you use a secure block cipher as hash function it should be peachy.

Comment: A Si mono-layer will grow a natural oxide fast (Score 5, Interesting) 67

I would be a little concerned that the silicon mono-layer would grow a natural oxide very fast and thus consume the silicon?

The solution in a HEMT transistor is cool in this respect. It is using an un-doped IV-V semiconductor next to a highly doped layer and excess carriers will form a two-dimensional electron gas at the interface. The carriers will move along the surface of the un-doped semi-conducter that since it is un-doped have better mobility and fewer defects than doped material. It must be something along this property they try to re-create with a silicon mono-layer.

Earth

First Measurement of Magnetic Field In Earth's Core 34

Posted by timothy
from the best-place-to-try-it dept.
An anonymous reader writes "A University of California, Berkeley, geophysicist has made the first-ever measurement of the strength of the magnetic field inside Earth's core, 1,800 miles underground. The magnetic field strength is 25 Gauss, or 50 times stronger than the magnetic field at the surface that makes compass needles align north-south. Though this number is in the middle of the range geophysicists predict, it puts constraints on the identity of the heat sources in the core that keep the internal dynamo running to maintain this magnetic field."

Comment: Re:If it is the SIM card disabling the warning?? (Score 1) 109

by Sigurd_Fafnersbane (#33101348) Attached to: Hacker Builds $1,500 Cell Phone Tapping Device

If that is the case, it must be specified how a SIM card request this blocking from the phone. Otherwise this is not likely to work between different manufacturers of phones and SIM cards. If there is a specified way of doing this it must be within the GSM protocol to do so.

Alternatively this is a behavior specified by certain network operators who buy phones and SIM cards in bulk and mandate an in-official spec extension from both the SIM card and the phone manufacturer.

In the latter case I think the problem is with the operator. You cannot blame Nokia, Motorola, Samsung, Apple etc., from making business with AT&T, Vodafone, Hutchinson and the like. If an extra feature is a requirement for selling to these operators in the first place what are you to do? The customer is always right and in the subsidized markets the customer is the operator and not the punter using the phone.

Comment: If it is the SIM card disabling the warning?? (Score 3, Insightful) 109

by Sigurd_Fafnersbane (#33101274) Attached to: Hacker Builds $1,500 Cell Phone Tapping Device
Although the GSM specifications say that a phone should pop up a warning when it connects to a station that does not have encryption, SIM cards disable that setting so that alerts are not displayed. Even though the GSM spec requires it, this is a deliberate choice on the cell phone makers, Paget said."

I am not sure I understand the above text. If it is the SIM card disabling the setting, why is this then labeled a deliberate choice by the cell phone makers?

Also I have seen at least on numerous Nokia mobile phones that an icon in the display notify you at least in some instances when encryption is disabled. (This happen quite frequently in e.g. China).

Comment: Re:noise floor? (Score 1) 253

by Sigurd_Fafnersbane (#32790762) Attached to: Android vs. iPhone 4 Signal Strength Bars Comparison

Could you elaborate on your claim that a reciever with ~0dB noise figure can detect a signal 15 times smaller than a reciever with ~1dB noise figure? I would expect around 1dB improvement in performance.

You are talking about the noise figure of the reciever and that will differ between handsets as will the reciever algorithms re-creating the transmitted information from the decoded signal.

For a given standard one implementation might require 3dB s/n to reach a given BER but other implementations might need 2dB or 4dB depending on the amount of signal processing and the quality of the algorithms used. For a given sensitivity you can then design your receiver with higher noise figure if your algorithms are better or you can live with lower baseband performance if you design the analogue front-end with lower noise.

You write: "the minimum detectable signal is often defined as the point where the signal power equals the input referred noise power.". This will be the case for a system and an algorithmic implementation where you can detect a signal with 0dB s/n. For systems with coding gain you will typically be able to detect signals with negative s/n and in WCDMA mode a phone is likely to be able to decode a signal with -20dB s/n.

Cellphones

Nokia Trades Symbian For MeeGo In N-Series Smartphones 184

Posted by timothy
from the unfortunate-name dept.
An anonymous reader writes "Nokia announced that moving forward, MeeGo would be the default operating system in the N series of smartphones (original Reuters report). Symbian will still be used in low-end devices from Nokia, Samsung, and Sony Ericsson. The move to MeeGo is a demonstration of support for the open source mobile OS, but considering the handset user experience hasn't been rolled out and likely won't be rolled out in time for its vague June deadline outlined at MeeGo.com, could the decision be premature?"
Math

First Self-Replicating Creature Spawned In Conway's Game of Life 241

Posted by Soulskill
from the emergent-gameplay dept.
Calopteryx writes "New Scientist has a story on a self-replicating entity which inhabits the mathematical universe known as the Game of Life. 'Dubbed Gemini, [Andrew Wade's] creature is made of two sets of identical structures, which sit at either end of the instruction tape. Each is a fraction of the size of the tape's length but, made up of two constructor arms and one "destructor," play a key role. Gemini's initial state contains three of these structures, plus a fourth that is incomplete. As the simulation progresses the incomplete structure begins to grow, while the structure at the start of the tape is demolished. The original Gemini continues to disassemble as the new one emerges, until after nearly 34 million generations, new life is born.'"

Comment: Re:Seems odd... (Score 1) 546

by Sigurd_Fafnersbane (#32416114) Attached to: GCC Moving To Use C++ Instead of C

I get your point.

It might be possible to maintain a "gcc-light" compiler written fully in C and then have the gcc build scripts completing this boot-strap compiler first. The gcc-light do not need to be fast or effective since it will only be used for boot-strapping. It might even be possible to make it as a pre-processor converting c++ into C.

What hath Bob wrought?

Working...