What are digital cryptography algorithms?

Question

Cryptography

I recently got into digital cryptography. I wrote a small application that accepts input text and keys from the user, you can choose the encryption algorithm from the proposed ones. Only here something reliable does not come to mind. Yes, I searched verbatim for "encryption algorithms", "digital cryptography algorithms", "digital encryption" and the like, but I found mostly primitive ones, such as Caesar, Vigenère, A1Z26, etc., which were used a long time ago and they all already known. But I need something more reliable.
Please let me know if there are any good resources/articles on this topic.

So that there are no questions, how do I represent and encrypt the input data: we take each character and convert it into a digital code, then we encrypt it. And so on, indented with a space. The result is an output string like51 30 23 23 20 91 44 20 9 23 31 . Then it can be decrypted.

Answer 1

I searched badly. The wikipedia article on encryption has a description of different kinds of algorithms.
Since you are still learning, look towards symmetric algorithms (they are mathematically simpler than asymmetric ones).
https://ru.wikipedia.org/wiki/Symmetric_cryptos...

Answer 2

It’s better not to ask for advice (and even free) on such a general topic here, but to buy and read a smart book.
https://www.amazon.com/Introduction-Cryptography-C...