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dimecres, 19 / novembre / 2003 |
Ja comencen a arribar els primers receptors de ràdio digital (DAB, Digital Audio Broadcasting). Aquests models, disponibles en model de sobretaula i de butxaca) permeten sintonitzar les emissores de ràdio que actualment estan emetent amb la tecnologia digital, on s'eliminen del tot les interferències i tota la mena de sorolls que hi ha a qualsevol equip de ràdio tradicional).
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22:29 (# Enllaç permanent) ()
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Quantum Cryptography Offers Uncrackable Keys
Using the laws of physics, not mathematical difficulty, to secure data, MagiQ Technologies' Navajo Security Gateway offers "future-proof, unbreakable" security devices.
How is quantum cryptography different from mathematically based encryption?
Instead of relying on mathematical difficulty, we’re actually using the laws of physics to guarantee authenticity. We can work with any encryption algorithm that someone wants to work with, the problem is that even if you have a really good encryption algorithm, if someone gets their hands on the key, all bets are off. So we’re improving the key distribution [scheme]. We ship with AES [Advanced Encryption Standard] or Triple-DES [Data Encryption Standard], or if someone like the NSA wants to put in their own algorithms, [it can].
How does it improve key distribution?
It’s impossible to read the key, it’s impossible to break the key. Once the key has been exchanged between point A and point B, the only thing someone can do is attack the box. But if someone tries to take a screwdriver and open one of the boxes, the keys are going to zero out, because the box is tamper-proofed. Even if it was possible for someone to get a copy of the key, the keys are changing at the rate of about once per second. So it wouldn’t do them any good.
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10:45 (# Enllaç permanent) ()
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[Jon Udell] sobre els missatges d'SPAM que inclouen cites de llibres clàssics i els seus dubtes per incloure'ls al seu sistema anti-spam:
In the TiVo era, the only TV commercials that survive may be the ones that people actually choose to watch. For spammers, too, survival may depend on delivering entertainment value. (TiVo és un dispositiu que combina un vídeo amb un disc dur, per tal de poder enregistrar les emissions de televisió, de forma que l'usuari pot fer-se una programació realment a mida).
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07:52 (# Enllaç permanent) ()
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© Copyright 2003 Xavier Caballe. 
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