Electromagnetic Eavesdropping Risks of Flat-Panel Displays

http://www.springerlink.com/content/twf249exybd86e02/

Electromagnetic eavesdropping of computer displays – first demonstrated to the general public by van Eck in 1985 – is not restricted to cathode-ray tubes. Modern flat-panel displays can be at least as vulnerable. They are equally driven by repetitive video signals in frequency ranges where even shielded cables leak detectable radio waves into the environment. Nearby eavesdroppers can pick up such compromising emanations with directional antennas and wideband receivers. Periodic averaging can lift a clearly readable image out of the background noise. The serial Gbit/s transmission formats used by modern digital video interfaces in effect modulate the signal, thereby making it even better suited for remote reception than emanations from analog systems. Understanding the exact transmission format used leads to new attacks and defenses. We can tune screen colors for optimal remote readability by eavesdroppers. We can likewise modify text-display routines to render the radio emanations unreadable.

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交換器與集線器不同之處是，集線器會將網路內某一使用者傳送之封包傳至所有已連接到集線器的電腦。而交換器則只會將封包傳送到指定目的地的電腦(透過ARP協定)， 相對上能減少數據碰撞及資料被竊聽的機會。交換器更能將同時傳到的封包分別處理，而集線器則不能。

Welcome to 21st Century Capitalism

So if I wake up in the morning with 5 cents in my packet,

borrow $1.04 from Joe and lend out $1.09 to Bill.

I have $1.09 in assets and $1.04 in liabilities and nothing in my packet.

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After one year, Bill repays me $1.10 ($1.09 loan and one penny interest), I wind up with 6 cents.

That is 20% return on a 1% loan.

If Bill is only able to pay me $.90, the global financial system collapses.

Comparison of a DNS Zone and DNS Domain

Domain name servers store information about part of the domain name space called a zone. The name server is authoritative for a particular zone. A single name server can be authoritative for many zones.

Understanding the difference between a zone and a domain is sometimes confusing. A zone is simply a portion of a domain. For example, the Domain Microsoft.com may contain all of the data for Microsoft.com, Marketing.microsoft.com and Development.microsoft.com. However, the zone Microsoft.com contains only information for Microsoft.com and references to the authoritative name servers for the subdomains.

The zone Microsoft.com can contain the data for subdomains of Microsoft.com if they have not been delegated to another server. For example, Marketing.microsoft.com may manage its own delegated zone. Development.microsoft.com may be managed by the parent, Microsoft.com.

Interactive Mode

# .bashrc

# User specific aliases and functions

alias rm='rm -i'
alias cp='cp -i'
alias mv='mv -i'

# Source global definitions
if [ -f /etc/bashrc ]; then
. /etc/bashrc
fi


OR emulate a recycle bin

#mkdir ~/recycle
#in .bashrc, alias mv='my_mv'

Save this file as "my_rm" in one of your PATH directories (/usr/local/bin is an appropriate place for it). Then chmod 700 my_rm, so it can be executed. Basically, you're setting things up so that whenever you say "rm FILE(S)" you actually do "mv FILE(S) ~/recycle". Feel free to modify this at your leisure.

#!/bin/sh
# This is a substitute for rm that moves deleted files to a recycle bin

RECYCLE="$HOME"/recycle
CURRENTDIR=`pwd`

for file in "$CURRENTDIR"/$*
do mv "$file" "$RECYCLE"
done

exit 0

To Me

想到什麼事情的時候, 要親筆寫下來, 不需要說出口, 而直接去做

反問對我而言其實是一種委婉把自己的想法講出來的方法, 並不是想要表現出高高在上的姿態

妳的遭遇我懂, 只是妳並不能要求別人一定要照著妳的想法去過日子, 看到了一點點負面的小事情就把它放大來檢視, 這樣不是會活得很不快樂嗎?

在妳心直口快的時候, 有沒有想到別人也是會受傷的? 聽妳的話讓你發洩, 只是撲滿還沒裝滿的時候你就急著想要把它打碎

妳說的話, 就大方面來說, 我都聽進去了, 我會一點一滴地學習並且實踐它

我必須把那些浮如飄絮的思緒, 漸漸轉化為清晰的思路和簡單的 文字

我會節制自己的感情並且珍惜它

我需要相信溫暖, 美好, 信任, 尊嚴, 堅強這些老掉牙的字眼

我不要頹廢, 空虛, 迷茫, 糟踐自己, 傷害別人

好好去愛, 去生活, 青春如此短暫, 不要歎老

偶爾可以停下來休息, 但是別蹲下來張望