Eavesdropping Analysis of PGP Metadata

This post attempts to answer the following question: If an evesdropper intercepts a message encrypted with gpg, how much information will they be able to extract from the message without a decryption key?

I will show the unencrypted metadata added to a GPG-encypted message, and I will present commands that can be used to extract this unencrypted metadata.


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My Search for The Best MP3 Player

I’m going on another cross-country cycling trip this summer, and I’m in the market for a good, solid MP3 player.

Disclaimer: I’m a software guy who likes my devices to be good quality and long lasting. I’m by no means an audiophile, hardware tech, or professional MP3 player reviewer. All of my research was done using Google, and the only MP3 player I’ve owned is the Sansa e260 v2.

Requirements

Note: These are my personal requirements. They effectively eliminated a *lot* of products in the MP3 market.

1. Rockbox Support

First and foremost, I need rockbox support. Rockbox is a must-have FOSS firmware for MP3 players with a fantastic feature list. You can buy an MP3 player with terrific hardware design, but your experience can be absolutely ruined by poorly designed firmware. My old Sansa e260 was this way, but once I installed rockbox, it was like the device was freed from a software prison. And, of course–another benefit of it being open source–you can completely customize the look+feel of your MP3 player with other user’s custom rockbox themes.

Here is a list of MP3 players (targets) and their support status for the Rockbox firmware.

2. Rugged Components that
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Package Manager Search Commands

In a given week, I touch maybe a half dozen different Operating Systems/Distributions. Some are similar to others (centos, rhel), some–not so much (solaris). The common commands are easy enough to remember ( @ls@ vs @dir@ ), but I always forget how to search through each OS’s package manager for a software package. For my reference (and perhaps yours?) here’s a list for each of the OSs’ package managers I use frequently:

yum – RHEL/CentOS

yum list

apt – Debian/Ubuntu

apt-cache search

pacman – Arch

pacman –sync –search pacman -Ss

portage – Gentoo

emerge –search # pkg names only emerge –searchdesc # pkg names & descriptions emerge -S # alias of –searchdesc  

See Also: “Install ‘build-essential’ on RHEL/CentOS and OpenSolaris”:http://tech.michaelaltfield.net/wp/?p=231

Google Chrome in 64-bit Sabayon Linux

I really should be studying for my stat exam tomorrow, but I was logging into my.ucf to download my lecture notes, and while Blackboard Learning System (the really shitty replacement for WebCT) was stuck in an infinite loading loop (most probably caused by incompetent javascript) I decided to finally get Google Chromium (which apparently has an excellent javascript engine) working on my Sabayon Linux desktop.


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Rockbox – Sansa e260v2

I bought a cheap, $30 refurbished MP3 player off of woot back in December ’08: the
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xen hung at “Checking for hardware changes”

So, xen is really beginning to piss me off. I turned off all my machines to do a snapshot, and when I tried to bring them back up, they were all in the ‘blocked’ state. Upon further investigation (using virt-manager/xm console), I found that they were hung at the “Checking for hardware changes” item in their boot process. This could be a CentOS/RHEL 5 issue, but I’m putting my money on xen.


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Enabling SELinux strict on RHEL5

I’ve been playing around with SELinux at work recently. Not surprisingly, I was struggling to get SELINUXTYPE=strict to work properly. Unfortunately, all “google results for ‘enabling selinux strict’ would return were dead ends. People would enable selinux strict, kernel panic, and ‘fix’ it by disabling selinux.

Well, a co-worker of mine *was* able to successfully enable selinux’s strict policy on RHEL5 (CentOS 5). He gave me this guide to post to the world for others to see how (thanks Mykola):


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Install “build-essential” on RHEL/CentOS and OpenSolaris

Debian

If you want to be able to compile packages in debain/ubunutu, you can issue the following command:

apt-get install build-essential

 

Red Hat

If you want to be able to compile packages in red hat/centos, you can issue the following command:

yum install make gcc gcc-c++ kernel-devel

…or, if you don’t care about maintaining a small footprint, you can get *all* of the development packages (including X devs–eww):

yum groupinstall "Development Tools"

 

Open Solaris

If you want to be able to compile packages in open solaris, you can issue the following command:

pkg install SUNWgcc

Clone Xen RHEL5 (CentOS 5.2) VM

Hello world! I just updated my whole server environment and, my, things are looking good. Anyway, I had to run through these steps a half dozen times, so I thought I would post it here for myself and (maybe even) others.

Here’s the commands I ran to turn a clone of my base RHEL5 (CentOS 5.2) Xen image into another working virtual machine on my RHEL5 (CentoOS 5.2) Xen Host:

Sabayon, KDE, and Evolution

I recently reformatted my hard drive–switching from pure Gentoo to the Sabayon fork. Sabayon did for Gentoo what Ubuntu did for Debian. It’s generally a lot easier to use, but–unlike Ubuntu–it doesn’t sacrifice functionality for ease-of-use.


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