Yesterday was the deadline for filing tax returns, but there was a system failure in the e-Tax system (National Tax Electronic Filing and Payment System), which caused a commotion.

Since I finished the submission a week ago, I was O.K.

The cause is unknown, but I believe it is 'probably due to the concentration of load before the deadline'.

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Many people may think that a "cyber attack" is a very sophisticated technology, but it is basically just an artificial attempt to do the same thing as the recent system failure of the e-Tax system.

Any server will (basically) go down if you set up a raging access against it.

When I was younger, I used to keep sending a huge number of computer-generated protest e-mails to the servers of spammers (statute of limitations has expired).

The server was then inaccessible.

However, this is an attack that "only brings down the server." In order to "hijack" or "rewrite content," a more advanced technique is required.

A server that has a domain name (a server that is publicly available on the Internet) can be cracked from the moment it is launched.

My server (kobore.net) is no exception.

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I have heard that the Russian government's web server was inaccessible.

And I, too, am currently unable to get service on a server that is (presumably) in Russia or Ukraine.

It is certain that our nation's servers are now the target of cyber attacks.

Many people may think, "I don't run servers, so I don't have to worry about it," but there is a possibility that they are being forced to participate in server attacks.

In order to bring down a server system, it is necessary to plant a raging access. For example, if 1,000 PCs can be hijacked, the cyber attack can be launched from 1,000 PCs.

To prevent your computer from being hijacked and used as a weapon to attack your country's infrastructure, you should at least perform "Windows Update" regularly.

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This is a good opportunity -- why don't we take a serious look at "cyber attack education"?