RSA today announced a version of Ron Rivest's blocker tag which is a supposed defence against unwanted RFID scans.

The tag, explained simply, answers affirmatively to an entire subsection of the RFID space, so that any scanner looking for a tag in that space always hears a yes (or gives up) and thus can't find a tag in that space.

I like to use our Rio Karma MP3 player in the car, but it's not nearly as good as it could be. So here are some jottings on what an ideal car dock would do for the player.

• Power and charge the player, of course
• Offer various options for sending audio to the car, including a built-in quality FM transmitter, a port for a special Cassette sized interface (more below) and various cables for car stereos that have an accessory jack (as mine has for a trunk CD-changer) or plain audio inputs.
• A wireless remote control to stick on the wheel (not needed if other remote control methods can work.)
• A microphone.
• To get really fancy, an 802.11 interface to allow it to sync up with computers inside the house while in the driveway. Though strictly, this would be even better inside the player, not in the dock.

The microphone would perform several roles. One, it would detect the ambient sound level in the car, and boost the music volume as the car gets noisier. No more super-loud when you start the car either.

Secondly, it would listen for the sound of the music the player is playing. It would try to tell if it was playing, so it could detect when the stereo is turned off or switched to something else, or when the car is turned off (if the loss of power from the accessory jack doesn't already reveal this.) When the sound stops (even if this takes 5 seconds to confirm) just pause the music back in time when the sound was first detected to stop. One could then from time to time send out pulses of the forthcoming audio, and if it hears them, treat that as a resumption of play.

Many people, trying to address concerns about the privacy implications of RFID tags have indicated that it can just become the norm, or even a requirement, to "burn" out the RFID tags in purchased products as they are sold.

I've just put up a new essay on my web site on whether challenge/response anti-spam systems are good or bad

As some may know, I've been running such a system longer than anybody, having written one in 1997. I wrote a white paper on best practices for such systems that some have found useful.

Generally, I'm the last person to suggest we use technology to control people's lives and what they view. However, it's also the duty of parents to help teach their children how and when to use the media. Most commonly today you see things like the V-chip, which let parents block their unskilled children from seeing shows with certain "ratings."

As I noted earlier, there are all sorts of risks with remote voting over the internet, even if I suggest a way to make it doable. However, this is different from the question of voting machines. Like the folks at Verified Voting I believe that a voter-verifiable paper ballot is the simplest way to make computerized voting more secure. And I like voting machines because they can improve access and even make preferential ballot possible down the road.

In 2000, the Florida Presidential election ended up in a tie. Many people get offended at that remark, because they don't think of elections as being compatible with ties, they insist that their candidate really won.

However, to scientists, you have a tie when the results differ by less than the margin of error. And I refer not simply to the margin of error from the problems in the voting machines, but a much more bizarre margin caused by political pressure to interpret the results in different ways.

Reading this NYT article about radar to cover car blind spots, which describes a system that will trigger lights in the rearview-mirror when cars are in the blind-spot, reminded me of an old idea I had some time ago I called "Eyes in the back of your head."

The idea would be to wear a special collar while driving. This collar would contain small electrodes that could lightly stimulate the skin on the back of the neck. Perhaps just one row, but ideally a small 2-D image should be possible.

This would be connected to a camera, radar or sonar system pointing back from the vehicle. It would map where other vehicles are, and turn that into an image on the back of the neck.

Thus, as a car came up behind you and passed you, it would feel like something brushing the back of your neck on one side.

I was inspired to this by reading about a system for the blind that mapped a video camera image onto a 2000 pixel electrode map on the stomach. It was found that over time, the nerves would retrain and a sort of limited vision could develop. Might this have application in driving, or perhaps combat?

I hinted last week I would write about a peril from and to automatic cars, or actually any drive-by-wire cars.

That peril is they become highly useful terrorist weapons. Today terrorists get kamikazis to drive ordinary cars to attack targets and checkpoints. It will be easy to modify a drive-by-wire car (including the self-parking cars already on the market) to be controlled by the cheap remote controls found on toy cars and planes today, and easy to mount a wireless camera (X10, the terrorist's tool!) as well.

We've all seen public bathrooms where the women have a line snaking out into the hall, but we guys can just "whiz" in and out. We have sympathy (but not too much, see the joke)

Here's a good solution that will probably never fly because we're uptight. Two bathrooms: One small one with nothing but urinals for men, and another one with nothing but stalls to be shared among the sexes.

In my home I now have a "home computer", for a while in the kitchen, now in the living room. Of course I have had computers in my home since the 70s, but this one is different. It's an old cheap laptop I picked up, not powerful at all. What's different is how I use it.

In general, I agree with the recommendations several security experts wrote condemning the new overseas military voting system SERVE, because voters used unsecure Windows PCs to vote.

Ok, so the USA invaded Iraq with fear of WMD the announced reason for the extraordinary step of a pre-emptive war. The White House doesn't plan to apologize or say oops as evidence mounts the reasons were bogus.

Question: Would it be a wise move for the Democrats, for example, to issue their own apology. To say, "We voted for this war because we were told there was a serious threat. Learning there was not, we are deeply saddened, sorry and ashamed. How could we have done this?"

Saying this would ask the other side of the aisle, "Why aren't you ashamed, too?"

Perhaps I am too cynical, and after this you're going to think I hate MoveOn, but I'm wondering if the publicity over CBS's refusal to air their anti-Bush ad in the Superbowl isn't the result of very clever strategizing.

CBS claims they don't air controversial ads like election ads during the SuperBowl and never has. As far as I know, that's true. Not that I'm approving of the policy, I think they should take almost any ad that pays the fee.

I recently read it costs about $150,000 to put in traffic lights here in California. That's a heavy duty pole, the lights, the power, the connection to other lights and the vehicle sensors. Seems to me modern technology should be able to make that a lot cheaper. New lights are all LED (the energy savings pay for themselves quickly) but that should also mean smaller safer power lines with special digging under the road. (Wonder if they could do it with light pipes and have no electricity up there.)

Today, the U.S. Agriculture secretary issued a call that nations not ban beef imports from a country (like the USA) just because a single cow has been found with Mad Cow disease.

In other words, exactly what the USA did to Canadian beef when a single cow was found in Alberta with the disease.

And let's not get started on the Weapons of Mass Destruction question.

For the second year in a row, I'm having a "Superbowl Commercials" party featuring my Tivo. Since the Tivo lets you watch a program while it's being recorded, you can watch the football at 20x speed and slow down for the commercials, and be finished when the game finishes.

To start and give the Tivo a chance to buffer up some game, we head for the hills in a renunciation of the couch potato for a hike. Then we return for the commercials and party.

I often talk about Challenge Response spam filters because I wrote the first one. One complaint people make is that the filters will challenge even forged mail, causing a challenge to be sent to the forgery victim. While this is not a DOS attack window as some people believe (since you can as easily DOS the target directly as get others to do it for you) it does need more consideration.

I seem to be thinking a lot about the future of automatic cars these days. Already we're seeing cars in Japan that can park themselves in a tight parallel parking spot, and this leads me to think that the next market for the technology, after the basic automatic highway, won't be the city street but the parking lot.

I went around and counted that we seem to have around 30 birick and wall-wart DC power supplies plugged in around the house, and many more that are not plugged in which charge or power various devices. More and more of what we buy is getting to be more efficient and lower power, which is good.

But it's time for standardization in DC power and battery charging. In fact, I would like to move to a world where DC devices don't come with a power supply by default, because you are expected to be able to power them at one of the standard voltage/current settings.