X-Git-Url: http://pere.pagekite.me/gitweb/homepage.git/blobdiff_plain/b3c964df1699fb995f5bccafd7cfda232e514dbb..993aa259e5d77cb3b1ba5cbaf3a363d1ba1b1199:/blog/index.html diff --git a/blog/index.html b/blog/index.html index d20b235a61..fd62fa8360 100644 --- a/blog/index.html +++ b/blog/index.html @@ -19,6 +19,58 @@ +
+
Hvordan kringkaster T-banen i Oslo sine overvåkningskamerasignaler?
+
2011-01-05 18:30
+
+

Jeg er den fornøyde eier av en håndholdt trådløs kamerascanner, +dvs. en radioscanner som automatisk scanner frekvensområdet 900 - 2500 +MHz og snapper opp radiokilder med PAL eller NTCS TV-signal og viser +signalet frem på en liten skjerm. Veldig morsom å ha med seg for å se +hva som finnes av trådløse overvåkningskamera. En får se bildet som +kameraet tar opp. :)

+ +

Men en kilde har den ikke klart å snappe opp: Sporveiens +overvåkningskamera på T-banestasjonene. Bildet sendes åpenbart +trådløst til T-baneføreren, men min scanner har ikke klart å ta inn +signalet. For å forsøke å finne ut av dette tok jeg i dag en nærmere +titt på en av boksene som sto på Forskningsparken T-banestasjon for å +se hva det er som sendes ut.

+ +

Boksen hadde følgende tekst:

+ +
+SupraLink
+Outdoor Transmitter 5.8 GHz
+
+default channel [ ]
+  identity code [ ]
+
+VTQ Videotronik
+06268 Querfurt
+www.vtq.de
+Made in Germany
+
+AC 230V   [strekkode]
+max 10W   84230936
+
+ +

Det var hyggelig av produsenten å legge inn lenke til nettsiden +sin. Der hadde de mye stilig elektronikk. Og forklaringen på hvorfor +min scanner ikke tar inn signalet er åpenbar ut fra merkelappen. 5.8 +GHz er langt over min scanners grense på 2.5 GHz. Trenger visst en +kraftigere scanner. :)

+
+
+ + + + Tags: norsk, surveillance. + +
+
+
+
Inspirerende fra en ukjent Skolelinux-skole
2011-01-04 07:50
@@ -304,7 +356,7 @@ langt.

- Tags: norsk, personvern. + Tags: norsk, personvern, surveillance.
@@ -1011,7 +1063,7 @@ kontakt slik at jeg kan få med også disse.

- Tags: norsk, personvern. + Tags: norsk, personvern, surveillance. @@ -1117,97 +1169,6 @@ RHEL6 with glxgears. No idea why.

-
-
Some thoughts on BitCoins
-
2010-12-11 15:10
-
-

As I continue to explore -BitCoin, I've starting to wonder -what properties the system have, and how it will be affected by laws -and regulations here in Norway. Here are some random notes.

- -

One interesting thing to note is that since the transactions are -verified using a peer to peer network, all details about a transaction -is known to everyone. This means that if a BitCoin address has been -published like I did with mine in my initial post about BitCoin, it is -possible for everyone to see how many BitCoins have been transfered to -that address. There is even a web service to look at the details for -all transactions. There I can see that my address -15oWEoG9dUPovwmUL9KWAnYRtNJEkP1u1b -have received 16.06 Bitcoin, the -1LfdGnGuWkpSJgbQySxxCWhv8MHqvwst3 -address of Simon Phipps have received 181.97 BitCoin and the address -1MCwBbhNGp5hRm5rC1Aims2YFRe2SXPYKt -of EFF have received 2447.38 BitCoins so far. Thank you to each and -every one of you that donated bitcoins to support my activity. The -fact that anyone can see how much money was transfered to a given -address make it more obvious why the BitCoin community recommend to -generate and hand out a new address for each transaction. I'm told -there is no way to track which addresses belong to a given person or -organisation without the person or organisation revealing it -themselves, as Simon, EFF and I have done.

- -

In Norway, and in most other countries, there are laws and -regulations limiting how much money one can transfer across the border -without declaring it. There are money laundering, tax and accounting -laws and regulations I would expect to apply to the use of BitCoin. -If the Skolelinux foundation -(SLX -Debian Labs) were to accept donations in BitCoin in addition to -normal bank transfers like EFF is doing, how should this be accounted? -Given that it is impossible to know if money can across the border or -not, should everything or nothing be declared? What exchange rate -should be used when calculating taxes? Would receivers have to pay -income tax if the foundation were to pay Skolelinux contributors in -BitCoin? I have no idea, but it would be interesting to know.

- -

For a currency to be useful and successful, it must be trusted and -accepted by a lot of users. It must be possible to get easy access to -the currency (as a wage or using currency exchanges), and it must be -easy to spend it. At the moment BitCoin seem fairly easy to get -access to, but there are very few places to spend it. I am not really -a regular user of any of the vendor types currently accepting BitCoin, -so I wonder when my kind of shop would start accepting BitCoins. I -would like to buy electronics, travels and subway tickets, not herbs -and books. :) The currency is young, and this will improve over time -if it become popular, but I suspect regular banks will start to lobby -to get BitCoin declared illegal if it become popular. I'm sure they -will claim it is helping fund terrorism and money laundering (which -probably would be true, as is any currency in existence), but I -believe the problems should be solved elsewhere and not by blaming -currencies.

- -

The process of creating new BitCoins is called mining, and it is -CPU intensive process that depend on a bit of luck as well (as one is -competing against all the other miners currently spending CPU cycles -to see which one get the next lump of cash). The "winner" get 50 -BitCoin when this happen. Yesterday I came across the obvious way to -join forces to increase ones changes of getting at least some coins, -by coordinating the work on mining BitCoins across several machines -and people, and sharing the result if one is lucky and get the 50 -BitCoins. Check out -BitCoin Pool -if this sounds interesting. I have not had time to try to set up a -machine to participate there yet, but have seen that running on ones -own for a few days have not yield any BitCoins througth mining -yet.

- -

Update 2010-12-15: Found an interesting -criticism of bitcoin. Not quite sure how valid it is, but thought -it was interesting to read. The arguments presented seem to be -equally valid for gold, which was used as a currency for many years.

-
-
- - - - Tags: bitcoin, debian, english, personvern, sikkerhet. - -
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