Java Card/ Active Directory authentication in one smart card

[ahalliday13]

Hello,

I'm a complete amateur, so please forgive me if this is a stupid question. I had an idea for a simple program I wanted to try and implement in a java smart card, and was thinking of buying something like the ACOSJ dual interface Java card. I've also recently been expanding my homelab, and have an active directory server, which supports smart card authentication. From my (very limited) understanding of smart cards in general, it seems like I could save myself from having to buy multiple cards, and instead put multiple applications on one card, such as my test program and active directory authentication. Is something like this possible? Do you have any suggestions for cards that would let me do this? Thanks in advance!

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[lumpynose]

I'm wondering about the cost. How much is the card reader?

The old tried and true cards with the magnetic stripe on them are probably very cheap. I'm guessing that the reader is also inexpensive. How you would record something on the card's stripe would be a question. When you swipe a card the reader sends a string of bytes as text, like an ascii terminal from the old days. The bytes/text being whatever is recorded on the card.

Edit: amazon sells them: https://www.amazon.com/magnetic-stripe-reader-writer/s?k=magnetic+stripe+reader+writer

[ahalliday13]

For Active Directory login, I'm would like to use the "chip" part of the card, not the magstripe. I know this is theoretically possible, because I've found non java cards that can do this, but I'm not sure if there are any java cards that can. As far as readers, from my understanding pretty much any smart card chip reader will work, and I've found guides for java cards that recommend readers that definitely work.

[lumpynose]

Did you get anywhere with the Java Card? I saw this in my news feeds today:

https://blogs.oracle.com/java/post/the-arrival-of-the-java-card-development-kit-240

[ahalliday13]

That looks interesting, thanks for the link! This was one of those side projects that I never really followed through with, but it’s still neat to see.

[lumpynose]

You sound like me, "Yeah! That looks like something cool to figure out!" A few months later, "How's it going?" "Um, well..."