Centroid.EU Blog(this blog is mostly encrypted - adults only)
July 2nd, 2009
Some people must have gotten hold of an old cache of my blog from 2006/2007
where I offered blog articles in encrypted form. You could order a decrypt
CD then to decrypt what was written, however noone at the time was interested.
I discontinued offering the blog in encrypted form and no sales were made. I
found some bounce mails from people today writing in to the decrypt mailbox
(which doesn't exist anymore). Thanks for your interests but the offer is
June 30th, 2009
Well I have been hacking away at
the last couple weeks now and I
finally got dual mode encryption into it. It now does AES as well as Blowfish
encryption. Because of the nature of the code it should be easy now to add
other ciphers now too, it just needs to be put in place. I started out with
blowfish and then coded my way to AES removing a lot of hard code such as
blocksizes which need to be dynamic with multiple ciphers. I'm thinking
perhaps I should write a manpage now (ughh) or something.
PS: with revision 50 I committed the NAT state expiration code which was
needed to complete this project. Perhaps it'll need a bit of tweaking
here and there but the main code is finished.
June 26th, 2009
If you want to use a sniffer to watch dhcp requests, replace rl0 with your NIC:
To read more about dhcpd read
June 21st, 2009
A Fifo is a named pipe. It is used for IPC. It is created with the mkfifo syscall or command. Fifos reside in the filesystem and require a process to read from it while another process writes to it.
To read more about fifo, go to
PS: Happy Solstice 6/2009!
June 21st, 2009
I participated in the Deschall (sp) crack challenge back in 97 or so and the
DES cipher was broken by a supercomputer especially built for the task. So
now it's 12 years later and a lot has happened. DES was replaced by AES and
AES is a lot more secure the literatures write.
But I'm left wondering why the dickens AES is a faster cipher than DES. Pretend
you are brute forcing a cipher, wouldn't then a faster cipher produce more
attempts per second than a slower cipher? This means a brute force would end
sooner to exhaust a cryptogram. Hmm. Here are some stats of DES and AES that
I cut from an "openssl speed" command on my home computer.
The 'numbers' are in 1000s of bytes per second processed.
type 16 bytes 64 bytes 256 bytes 1024 bytes 8192 bytes
des cbc 19981.67k 26454.32k 27109.93k 27133.40k 26813.16k
des ede3 9693.15k 9656.40k 9351.31k 9793.71k 9824.77k
blowfish cbc 35115.53k 41062.07k 39941.05k 41949.41k 41771.29k
aes-128 cbc 33001.89k 51473.35k 60324.97k 66089.46k 63121.28k
aes-192 cbc 30109.43k 46625.91k 51426.45k 54773.53k 56143.75k
aes-256 cbc 34359.02k 42632.24k 47491.13k 47512.66k 46742.06k
June 19th, 2009
Yesterday I found this movie on youtube and it touched me. It basically
warned humanity once again of our ways and said in 10 years the disruption
of the harmony of life will be irreversible. The movie has some great
footage from all over the world, check it out.
June 17th, 2009
In the northern hemisphere (Europe, North America, Asia) we'll have the
Summer Solstice on
the 21st of June, which means that on this day at high
noon the sun is at its highest angle from the horizon. In the southern
hemisphere (parts of South America, Australia, parts of Africa) the sun is
at its lowest angle from the horizon (at high noon). Why this is is because
of the tilt of our earth. This tilt is responsible for our seasons (at
least in the northern hemisphere).
June 13th, 2009
Not much is up, I wrote a linux client for
natally which seems to work. I
improved the openbsd client for natally a bit so that routes can be set up
which unfortunately doesn't work on the linux client. I'm going to skip
putting up a random hackepedia since there is so little content this week.
June 6th, 2009
tr stands for translate characters and that's what it does.
To read more about tr go here.
June 5th, 2009
Natally is a NAT/VPN program that works on a host that cannot do tun/tap. With
iptables available, it'll make a packet socket and run with a raw socket. At
the same time one can connect to it and have the session blowfish encrypted. So
far there is some problems with performance that I'm working on. It's doggedly
slow but I'm positive that it can be sped up.
Natally is now hosted at sourceforge. This is its homepage.
There exists a server written for Linux OpenSuse 10.3 and a client written
for OpenBSD 4.5. In the future there may be other clients written for linux
perhaps, but it's not a priority for me right now.
Update: Progress. I've replaced the ip and tcp checksumming routines and there
now isn't any bad checksums which really were part of the slowness as the
implementation had to wait for retransmissions and hope the checksums were
alright. Phew am I glad that was found.
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