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I am 49 years old and have been using Delphi since 1999. I don't know any other programming languages—or rather, I should say that I have been deeply entrenched in Delphi's programming paradigm. I used to primarily develop client-server (C/S) projects, spending nearly 20 years writing code of this kind. Over time, I grew to dislike it. Fortunately, in recent years, I’ve had the opportunity to work more with hardware-related tasks, which means I no longer have to develop database or UI-related code. This change has made me very happy, and I really enjoy writing code that interacts with hardware. Since I develop products related to drones, I have to handle camera data streams and figure out how to transmit images to the ground. In recent years, the industry has increasingly relied on AI, so I’ve also added AI-related features to my work. It took me nearly two years to implement all these functionalities. In the end, I found that the programs I wrote in Delphi performed just as well as those written in native Android Java, and sometimes even better. When compared to C++ programs on Linux, Delphi's performance is slightly weaker, but I believe this gap comes from the operating system itself rather than being an issue with Delphi. My next step will be to try porting my current projects to Linux, even though I’ve never used Delphi to develop Linux applications before.

You say that, but in your blog post you mention you bought one and then you show a signtool example using a pfx - which is it? You cannot buy a certificate where the private key is provided in a pfx file these days - it has to be provided on a usb token or installed onto a HSM, both of which make the private key non exportable. I recently bought a 3 year OV certificate from SSL.com * for USD $328.95 - I specified no usb key as I already had a Yubikey 5 FIPS that I could use. I also have a certificate on a Safenet token - but wanted a certificate on a yubikey for testing purposes (and as a backup). * They initially issued the certificate incorrectly - I had to contact their support and go through the whole attestation again - however it's still not working (signtool succeeds but windows says "no signature present in the subject") - waiting to hear back from their support again.

I had a terrible experience with Certum - I bought a sim and card reader from them for testing Signotaur - however I didn't purchase a certificate - I can test with self signed certificates - however they refused to provide the pin to the card because I didn't purchase a certificate - rendering it completely useless. I do not recommend them at all.