Top 10 How To Videos

Alguns videos de truques, engenharia social ou o que lhe queiram chamar... selecionados pelo pessoal do site life hacker.
http://lifehacker.com/400292/top-10-how-to-videos

Rebecca Norlander - Challenge and Success

In the often male dominated world of computers, Rebecca Norlander has made a name for herself by taking on big challenges, and proving she has what it takes to deliver results.  Join us to learn how Rebecca got her start at Microsoft, advancing through roles where she had tremendous impact on Excel, Internet Explorer, Windows XP SP2, Windows Vista Security, and now as Technical Strategist to Chief Software Architect, Ray Ozzie.

 
http://channel9.msdn.com/shows/Behind+The+Code/Rebecca-Norlander-Challenge-and-Success/

Achar o MTU da Ligação ADSL!

Como achar o MTU da Ligação ADSL!

Para a ADSL sabemos que o valor padrão do MTU para ADSL deve ser igual a 1492, mas este valor pode não ser o mais correto para tua ligação, na minha linha é mas pode ser diferente na tua, o meu Router tinha o MTU a 1500 o q provocava várias quedas de linha por dia, até que comecei a pesquisar e descobri algures como encontrar o valor EXACTO do MTU para a ligação ADSL!

Ora mt bem:

1. Iniciar a "Linha de Comandos".
2. Escreves "ping -f -l 1400 www.sapo.pt" (Pode ser ou outro URL qualquer coloquei o www.sapo.pt porque é o fornecedor da minha ligação)
   
   Vai aparecer algo do género:
   
   A enviar para www.sapo.pt [213.13.146.140] com 1400 bytes de dados:
   
   Resposta de 213.13.146.140: bytes=1400 tempo=94ms TTL=122
   Resposta de 213.13.146.140: bytes=1400 tempo=94ms TTL=122
   Resposta de 213.13.146.140: bytes=1400 tempo=93ms TTL=122
   Resposta de 213.13.146.140: bytes=1400 tempo=97ms TTL=122
   
   Estatísticas de ping para 213.13.146.140:
   Pacotes: Enviados = 4, Recebidos = 4, Perdidos = 0 (perda: 0%),
   Tempo aproximado de ida e volta em milissegundos:
   Mínimo = 93ms, Máximo = 97ms, Média = 94ms
3. O ping a 1400 bytes funciona, agora vais aumentando o valor dos pacotes de bytes de 10 em 10 até aparecer algo do género:
   
   A enviar para www.sapo.pt [213.13.146.140] com 1470 bytes de dados:
   
   O pacote precisa de ser fragmentado, mas definido como DF.
   O pacote precisa de ser fragmentado, mas definido como DF.
   O pacote precisa de ser fragmentado, mas definido como DF.
   O pacote precisa de ser fragmentado, mas definido como DF.
   
   Estatísticas de ping para 213.13.146.140:
   Pacotes: Enviados = 4, Recebidos = 0, Perdidos = 4 (perda: 100%),
   
   O ping com pacotes de 1470 bytes já não é possivel enviar, agora começas a diminuir de 1 byte em 1 byte até aparecer algo do género do ponto 2.
4. No meu caso o valor máximo de bytes por pacote é 1464 bytes por pacote sem ele necessitar de ser fragmentado:
   
   A enviar para www.sapo.pt [213.13.146.140] com 1464 bytes de dados:
   
   Resposta de 213.13.146.140: bytes=1464 tempo=119ms TTL=122
   Resposta de 213.13.146.140: bytes=1464 tempo=94ms TTL=122
   Resposta de 213.13.146.140: bytes=1464 tempo=94ms TTL=122
   Resposta de 213.13.146.140: bytes=1464 tempo=83ms TTL=122
   
   Estatísticas de ping para 213.13.146.140:
   Pacotes: Enviados = 4, Recebidos = 4, Perdidos = 0 (perda: 0%),
   Tempo aproximado de ida e volta em milissegundos:
   Mínimo = 83ms, Máximo = 119ms, Média = 97ms
5. Para terminar, ao valor que apuraste somas 28 que é o valor em bytes do cabeçalho TCP/IP. No meu caso 1464 + 28 = 1492.

Is your system ICC Version 4 ready?

99% of the people don't use color management.

And why you should?

The reason is simple: to see the most exact color.
One way to find out is to view or print this page using your system.
The test image uses a mix of unusual ICC version 4 and version 2 profiles, one for each quadrant of the image.

http://www.color.org/version4html.xalter



By default firefox have color management disable.
Install your monitor drivers and turn on color management in firefox.

As usual insert:

about:config

in address bar, them:

gfx.color_management.enabled -> true

by the way, text smoothing:

gfx.use_text_smoothing_setting -> true

gfx.color_management.enablev4 -> true

restart firefox and test again the link in the beginning.
All should appear as one continuous color image.

For calibrate your monitor, brightness and contrast try this page:
http://www.photofriday.com/calibrate.php
You should see all the blacks tone and white tone distinctly.
Hope this information is helpfull

Kevin Mitnick's Business Card

O Cartão de um famoso hacker... espetacular

imagem original em http://www.flickr.com/photos/ranh/106709219/

Dota

O novo video

O original video

Penso eu que é melhor
E para quem ainda não conhece Basshunter, eis a canção que o tornou famoso, Boten Anna

Gilles Brassard

Edge work: Using quantum mechanics to protect our privacy
Why? It will make electronic communications more secure.
Where? Université de Montréal
Initial response: “Very few people took it seriously.”

Privacy wonks should love Gilles Brassard. He is the guy who has delivered their seemingly impossible desire: an absolutely confidential way to send electronic messages. Unfortunately, it involves quantum mechanics, the twilight zone of physics. Brassard, a 52-year-old professor of computer science at the Université de Montréal, turned the wild idea of using the quantum world to send messages electronically into something real. Soon it may be essential.

Quantum cryptography ensures complete privacy because any attempt to observe the transmission will change the message. It is a basic principle of quantum mechanics: The act of observing affects the thing observed. “If I send you information in the form of quantum signals and someone tries to eavesdrop on that signal,” Brassard explains, “the act of eavesdropping will disturb the signal. It will also alert the recipient if the transmission has been compromised.”

As a child Brassard wanted to be a mathematician, but he became fascinated with programming when he took a computer science course at the Université de Montréal, which he entered at age 13. A decade later, in 1979, he became fascinated with how the strange properties of quantum mechanics could be harnessed to send confidential messages without an elaborate encoded key, as required by conventional cryptography. In 1983 he codeveloped BB84, the first practical quantum cryptography scheme, and he continued to refine it for years.

Today, along with physicists like Christopher A. Fuchs of the Perimeter Institute for Theoretical Physics in Waterloo, Ontario, he is also reexamining the foundations of quantum mechanics to see where information fits in. Brassard suspects that underlying the fundamental laws of the universe are information theory axioms rather than waves or particles. “I don’t have any formal training as a physicist,” he says, “but sometimes that’s good. It helps you see things differently.”