Are open encryption methods secure?

Question

Encryption

Hello.
I'm interested in such a question, let's say I decided using js, open encryption algorithms and a key that I don't send anywhere, to encrypt a string and send it to the server for storage. It doesn't matter to a database or a file.
Later I will need to pick it up and decrypt it locally or in the browser.
Can it be encrypted with a high degree of protection? Or in this case, again, everything depends on the power of the decrypting equipment?
And what algorithms would you recommend on this topic?
Please do not kick, the topic itself is not entirely clear to me, so the question for the pros may look stupid.

Answer 1

Yes, of course, there are a lot of JS libraries that implement data encryption / decryption using various cryptosystems.
For example, RSA-2048 to encrypt with JS - slightly slows down, for me personally. But it works.
socialpic.ru/crypton