https://dzone.com/articles/tlsssl-terminology-and-basics
https://dzone.com/articles/tls-security-tlsssl-explained

baeldung-misc
https://www.baeldung.com/java-digital-signature
    !!!
https://www.baeldung.com/java-bouncy-castle-pgp-encryption
https://www.baeldung.com/java-ssl-debug-logging

2021
https://github.com/MaksimDzhangirov/complete-gRPC/blob/main/SSL_TLS_lecture_rus.md
    ! need to read
https://itsecforu.ru/2021/12/01/%f0%9f%94%90-%d0%ba%d0%b0%d0%ba-%d0%bf%d1%80%d0%be%d0%b2%d0%b5%d1%80%d0%b8%d1%82%d1%8c-%d0%bf%d0%be%d0%b4%d0%b4%d0%b5%d1%80%d0%b6%d0%b8%d0%b2%d0%b0%d0%b5%d0%bc%d1%8b%d0%b5-tls-%d0%b8-ssl-%d0%b0%d0%bb/
    ! check supported crypto algos
2019
https://opensource.com/article/19/6/cryptography-basics-openssl-part-2
    https://rebrainme.com/blog/devops/ispolzovanie-openssl-heshi-czifrovye-podpisi-i-mnogoe-drugoe/
https://opensource.com/article/19/6/cryptography-basics-openssl-part-1
    https://rebrainme.com/blog/devops/nachalo-raboty-s-openssl-osnovy-kriptografii/
    https://habr.com/ru/company/otus/blog/666700/