OpenSSL is a library available for multiple systems. It has been available since 1998. It is widely used in the area of cryptography. It is an open-source, commercial-grade application that enables its users to install the SSL certificate and complete the SSL tasks with ease. It helps with Certificate Signing Requests (CSR) and also provides the facility to convert the certificate into different SSL formats and perform verifications.

OpenSSL comes with a toolkit with a rich set of features for the purposes of Transport Layer Security (TLS) and Secure Sockets Layer (SSL). It is actively run and maintained by the OpenSSL Management Committee.

mod_jk is a widely used module that serves as an effective replacement for the well-known mod_jserv. It is recognized as a sophisticated and well-developed plugin for Tomcat and Apache. It facilitates high-quality communication and ease between Tomcat and Apache. It is known for its simplicity and high-quality support. 

Mod_jk is mainly recognized for its layered approach and compatibility. It provides high-quality support for SSL as well. The use of the mod_jk requires users to be familiar with various terms such as worker process, in-process worker and plug-in configuration, among others. The Binaries for this module are also made easily available.

Comparison OpenSSL vs mod jk