Encrypted-Session
The Encrypted Session dynamic module provides encryption and decryption support for NGINX variables based on AES-256 with MAC. It is usually used with the Set-Misc dynamic module and the NGINX rewrite module.
Prerequisites
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Check the Technical Specifications page to verify that the module is supported by your operating system. 
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Prior to installing the module, verify that the NDK module is already installed. 
Installation
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Install the Encrypted Session module package nginx-plus-module-encrypted-session.For Amazon Linux 2, CentOS, Oracle Linux, and RHEL: yum install nginx-plus-module-encrypted-sessionfor Amazon Linux 2023, AlmaLinux, Rocky Linux: dnf install nginx-plus-module-encrypted-sessionFor Debian and Ubuntu: apt-get install nginx-plus-module-encrypted-sessionFor SLES: zypper install nginx-plus-module-encrypted-sessionFor Alpine: apk add nginx-plus-module-encrypted-sessionFor FreeBSD: pkg install nginx-plus-module-encrypted-session
Configuration
After installation you will need to enable and configure the module in F5 NGINX Plus configuration file nginx.conf.
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Put the load_moduledirective in the top‑level (“main”) context of NGINX Plus configuration file, nginx.conf:load_module modules/ndk_http_module.so; load_module modules/ngx_http_encrypted_session_module.so;Note:
 The directives must be in this order.
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Perform additional configuration as required by the module. 
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Test the configuration and reload NGINX Plus to enable the module: nginx -t && nginx -s reload