+1 for this... Really good. Did it years ago and it was all very clear to me.

However as I don't use this in daily life I pretty much lost all the knowledge again :)

Same. Having finished the course years ago, I remember most vividly the following: never implement your own crypto. Not many details survived the time but it was intellectually rewarding.

Just don’t hold your breath for Cryptography 2

I was hoping it would finally be available this year. Now I think it's never going to happen.

The course is apparently being released when the accompanying book is complete. The book is free, and you can see the current version here: https://cryptobook.us/

It's super dense though, even with a math background I struggled to make headway.

That perennial reddit thread on this is priceless, it should be an official meme now!

Also pretend or real J.P Aumasson handle?

I invest a lot of time in data storage and synchronization tools (i'm a fan of immutable stores), but i know very little about crypto.

I'd like to know enough to be able to confidently use existing tools to encrypt data at rest, transit, pub/priv key, etc.

Would this course give me such a foundation to achieve this?

I'd say yes, provided you complement the better mental model this course will give you with a reputable cookbook list of how to do X in practice (maybe start at https://latacora.micro.blog/2018/04/03/cryptographic-right-a...), and everything you'd like to do falls into some well-established pattern.

But then you probably shouldn't trust my opinion, because I'm not a domain expert (although I have been involved in security design together with people who are domain experts), and whatever understanding I had is probably somewhat rusty by now .