I’m pretty sure we did the tutorials for this lesson yesterday, but had this lecture in the forth week. I swear, they’re all out of whack.
Monthly Archives: December 2008
Access your uni drive from anywhere
This is mostly for DMU students, but this might actually turn into a WinSCP tutorial.
Turns out some people didn’t know they have access to their H drive from outside of the lab, so lemme explain how.
Your H drive is actually stored on a Linux server, where you have your own user. I doubt that means much to you if you have to be reading this, but it’s cool. It’s basically having your own account on the operating system, and you can do a lot more than just host files on there, but that’s all we’re bothered about at the moment.
You’ll need to download WinSCP. Install that with the Norton Commander view when prompted for it. Open it up when it’s installed, you’ll get this screen. Fill it up with your information!
WinSCP login screen with my DMU information in it
The host name is sftp.cse.dmu.ac.uk, and your username is your P number, with the password you use to log into lab computers. Make sure the file protocol is SFTP.
Then press login, and it’ll take a few seconds to connect. Then you’ll get an window like this:
This is what it looks like when I log in
On the left is the machine that you’re working on now (known as the local machine). They’re all your files and folders on your computer. On the right is your harddrive on DMU’s servers (the remote machine). You can drag and drop files and folders from one computer to the other however you like from then on.
Remember though, don’t delete any of the .whatever files. They’re all configuration files for Linux. To be honest, unless you use PuTTY to access the server command line styles you’ll never be affected by them.
Sys. Anal.: Two
In an attempt to get through these as quickly as possible, here’s the second one in one night.
This lecture is about the impact of information, and the new ways it’s become important, on businesses.
Systems Analysis: First lecture
I’ve not done anything at all on Sys. Anal. yet, so I thought I’d do that now.
I’d RTFM if I could find it
Tonight’s adventure is going to be understanding how to encrypt stuff using my public key, and then how to unencrypt it.
Here’s my RSA public key:
PuTTY-User-Key-File-2: ssh-rsa Encryption: aes256-cbc Comment: My first key Public-Lines: 4 AAAAB3NzaC1yc2EAAAABJQAAAIBv67wL6ms9S2VKS7FzAKzkU7ikhcbA/W8G7mas OLT50qFCyPdoh1hlK18Vg/3okbhVybqQmXFKT6jH6+gzRc6yZvUw7rqjAk+j8BMR nAOVJSr2+YXeJk3OHbcdao83mOKDN/QfV2IsoAYdbEyVtCLRII47tflA/kKDdflH OfZQbw==
I generated that with puttygen. I use it fine on my server, but I’ve no idea how to use it for anything else. Nor even if I should be.
From there, I’ve really no idea what to do next…
Turns out, ssh-rsa might not be what I want, but I’m going to stick with it. I found an article on public key encryption that looks helpful, but still a bit over my head. I’m tired now though, so I’m going to bed. I’ll look into it again tomorrow.
Just stumbled upon the manual for GPG, which I guess I should be using, maybe? I’ll read it later.
Linux systems get it built into gedit. Pfft.
Hokay! So, that was the wrong key. I’ve made a new one:
-----BEGIN PGP PUBLIC KEY BLOCK----- Version: GnuPG v1.4.9 (MingW32) mQGiBEk4LOwRBACLWXX5sPiOB+siESXP4yrqkxXRiaI0B+7i2hbdhhgOEWuhIWHX ZoU/DkbcqoECBNX5gsrPxuMugtLwG7wuQqHAMhOpvxmKp3JiJu9VRp5FTE3bKOOy UP/FsqQcIPb2Ja2pVZYphTZKqzRHubbks/FQj82W6tRKvAlRzOkT8QnYGwCg+yhb GRzwotgkTSgbdTbx9mU5+pMD/jRQqvdDQKwD7Ggidx07q62l+Kp26v7AelnCn9Gk FQXbPUDF6jYwjkhuFySGQE5yTxaEN/kKYLcdLFQua+gT+trJglD5bbGUVWozLP47 CM1rCqGB+onD8i95CS0xzLOECpE8FinYHNlYMNHfMvLCEtDWD/1i4JDZYG904Sxh tKBlBACFURBqSvN7XoLWkpmQzpoRaGQMSsTn6ADtN4PMKfiq2GnBqFUvIDmwK0uY Gyq70Z0q0FUIiBS/jk/PIdv3cC+tHGrIXOE3Pu7onV0czjLMs57j7rMlSdYbFpSZ vLX+fyufugHbl/2GLDQz43b+OncdXnzbYIEgcO4qN72KCbIOQbQ8U2hhbmUgUHJl ZWNlIChGaXJzdCBEU0EgYW5kIEVsZ2FtYWwga2V5KSA8c2hhbWVzc0BnbWFpbC5j b20+iGAEExECACAFAkk4LOwCGwMGCwkIBwMCBBUCCAMEFgIDAQIeAQIXgAAKCRAt 8a+vr0tSdZz8AJwOmIaasZDgxI78U41YAP5GVSDuAwCfUPNVdjdWVada3p0wOGN2 2Nx1gIq5Ag0ESTgs7BAIAKdUDwhjVZjhYr9jWctbSaOUzMAgJCckMeuZANHLj8ZQ zUXYdM7UvrQFBSMEMINKs2kgrhVIBwQyNDtfHlhGemLMY+LupUD8G3o1K1oMFPE6 fJKtV4YN1c8FiBoQs32aIvtmu6HrlPwSLSGjoCI4VjZM1Uf7yZyO6qMk5Blqh/U5 CicDtbGSHirnAy4hHIsMB+Isph7gegz6bmbDXw0poHeZTepey6IqFTiEZW690IYT ykbVjx62RzP3mqQbL6LPW79V7lbXEMzRzSg9X0SSjHxgA3GF+IQm/VIp7Ryfbbd+ BjZUiaHVLSTcKMMWXLo5wvEXGrm750MkKiPyLC2UTvsAAwUH/0bAJZNtt6WLwdsh uALOeT8/USAYig3EEFE9u/Q1My7e9MprPbWkaJQOgVjlR3azZvu41rHUfVmsfJMF 2OhTV/qA5R/tz+TK5W08RRZCqWRuy8+ywSYAk0U16MIO58HoXZ6U50zS0EviyBVY z/8OgBgHFEJNcZwdf/lC7oZd49XGFTRwCp/bIcpv5sLTxrrMPqed9LuSP6HmhiZk 4rm+6+BY5MWvLhs4Dq6ZbpAgEuabT90J2Ry6QgBGKP6yj8il/eD0ASXDe2RdseGz RRoGPWWCpd50zZBdpSNP67S5esGKnJXiEe35hkxPwIiasaz0G6j/ftTiCW/35JiI mXkSsnSISQQYEQIACQUCSTgs7AIbDAAKCRAt8a+vr0tSdWnyAJ91k7o7nZ1pCiwZ nQF9po9GTctfbACfRIH9OV1qxBfaG4lxBEC3XdZtcvc= =sYo5 -----END PGP PUBLIC KEY BLOCK-----
Now, I’m working out how to encrypt something.
Huzzah! Done it! So, I have a text file I want to encrypt, textfile.txt which just has “Hi there” in it. Do this to encrypt it, with my own public key:
C:>gpg --armor --encrypt --recipitent shamess@gmail.com textfile.txt
That should output the encrypted text in ASCII to STDOUT, which for my key is:
-----BEGIN PGP MESSAGE----- Version: GnuPG v1.4.9 (MingW32) hQIOA6g4L8dw7u8pEAf/U7GPg5yRFj6gW1j+UYaRETaooe32o/a4Go7pTLM76Z1x 8a/RjVsl27sbpTT7k21MvBigoasbjncT6LjkHmDjsUEtMJ1F1RvG/hrloZB7ZGYD ZjYN7sVqw4K87qVIPjRejB1wofm6TjuohJ2FAA7ObxUQ0rdP/ENPiUkdntxng4ew pQrQbl25/Dz9A0VBLzdW+045/nKcMvA4iqsKC3DiF8AmY7IhmOWqZvxwdcahQODe iaqKLKEbqbKdj7Bocb0C1MUJMij54eYxU83LyvjhVZuejsmh7yrH1GXzwIhDuwbW Qd8uQrQ80dQyXwgK2CFdybyEXkO0iyKx8fT8jCs2owf5Af5gk0TACyBYZDF93y4P qi0fJcJq/+7o7ywyCMD1Jz++yTMNVykHWO8tdm4AHqWdX21WZDXrJEjbjozZGXfo uu4YEDHGvHelPnvsS1afGyehXZSEvs79XdxkEJ2upLgta+LPoQirv7A2g2khAklT 4dmKdvj9v9oBQesvuwbIlHjrkuOvHssHQL+Y4Sf2UJ2OT4/xygyQOJIuMg9V6dNh oHyKpqYpOdNog12W2+aSezL56+emSgCmaSEm3eyeKjLJ0Xd/O0qzQmvYMZStmFvZ rWw+UB/4Z7ftEz9VxMD22YQyKH4nCUl27KSPsE0LY1sX9TBm69gqILb/3dqGphba vNJQAdkey0o94cw+JZhThkAUPYXsyH0cLCrwRv7FrbgyTImHEjzVYpZj12cCLHeC d+2AfjqnN7AaLB55+gg0aLh/mytPUVsQfrmpTVwy68nUh0g= =tGrq -----END PGP MESSAGE-----
To decrypt use:
C:>gpg --decrypt
And then just paste the ASCII.
Computer Tech.: Lecture three
I wasn’t even in this lecture, so this material is new to me. The fetch/execute cycle isn’t though.
Continue reading
Committed to SVN
I decided to try Subversion out some more, and made it so Trinity’s live-dev and my offline-dev are both working from files from the same repository. Instead of FTPing all the files over to Trinity every time I make some changes (and I usually have to reupload all of them, since I can never remember which files I’ve changed), I can just commit them on my laptop, which uploads the changed files to the repo, and then checkout on Trinity’s version and every thing’s back up-to-date.
The one problem I’m having though is that Trinity’s version has a completely different password for the database than my local version does. In the past I’ve just never overwritten the database.php file, so both have the right password, but now all the changes are uploaded, so are the different passwords!
I need some way of saying “don’t commit the database file”. Or at even better, “don’t change this one line”.
There’s a down point to SEO
I allow search engines in my robots.txt and immediately get flooded with spam. Thank gosh for Akismet, eh?
Driving test two: If statements
I’m fairly sure most people haven’t done this one yet, so I’m not going to give you my finished code for a little while. I’ll walk you through what you should have though, and explain the things you’ll need to know to complete it.
Computer tech.: lecture two
Right off the bat, I’m a bit confused with what this lecture is about.