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PKI Certificate in OpenSSL PEM Format
This section describes the PEM (Privacy Enhanced Mail) file format to store PKI certificates.
2026-05-12, ∼179🔥, 0💬

Keychain File Locations on macOS
This section provides a tutorial example on how to find Keychain file locations on macOS computers.
2022-10-08, ∼179🔥, 0💬

/etc/pki/ Directory and Symbolic Links
This section describes the /etc/pki/ directory holding CA certificates in different formats for different types of applications.
2026-05-12, ∼172🔥, 0💬

Use "openssl ca" as Root CA
This section provides a tutorial example on how to use the 'openssl ca' command as a root CA to sign a CSR (Certificate Signing Request) into a certificate using a given section in openssl.cnf.
2024-11-27, ∼169🔥, 0💬

update-ca-certificates Command on Ubuntu
This section describes how to use the update-ca-certificates Command to manage trusted root CA certificates on Ubuntu computers.
2026-05-06, ∼167🔥, 0💬

References
List of reference materials used in this book.
2024-11-27, ∼166🔥, 0💬

"trust" Command to Manage Linux Trust Store
This section describes the 'trust' command from the 'p11-kit' package to manage the Linux Trust Store.
2026-05-12, ∼164🔥, 0💬

Directory and Files of Linux Trust Store
This section provides tutorial examples on extracting certificates from Linux Trust Store using the 'trust extract' command.
2026-05-12, ∼163🔥, 0💬

Testing OpenSSL with stream_socket_client()
This section provides a tutorial example on how to test the PHP OpenSSL module with the stream_socket_client() function, which allows you to open a socket connection to a remote computer with the secure TLS protocol and SSL stream context options.
2022-10-10, ∼161🔥, 0💬

Linux Certificate Stores and Tools
This chapter provides tutorial notes and example codes on Linux Certificate stores and tools. Topics include root CA certificate location; 'update-ca-certificates' and 'update-ca-trust' commands to main trusted root CA certificates; 'certutil' command to manage NSS certificate database for Firefox a...
2026-05-06, ∼160🔥, 0💬

"update-ca-trust" vs "trust" on Red Hat Computers
This section describes the differences between 'update-ca-trust' and 'trust' commands on Red Hat-based computers.
2026-05-12, ∼159🔥, 0💬

CA Certificates at "/etc/ssl | /private/etc/ssl"
This section provides a tutorial example on how to find CA certificate files used by the PHP programming engine on macOS computers.
2022-10-09, ∼159🔥, 0💬

What Is ca-certificates Package
This section describes the 'ca-certificates' package, which installs trusted root CA certificates supporting SSL/TLS applications.
2026-05-12, ∼157🔥, 0💬

"update-ca-certificates" to Disable CA Certificate
This section provides a tutorial example on how to use the update-ca-certificates Command to disable an existing root CA certificate in the trust store on Linux systems.
2026-05-12, ∼157🔥, 0💬

"update-ca-trust" to Remove CA Certificate
This section provides a tutorial example on removing user added CA certificates from Trust Store using the 'update-ca-trust' command on Red Hat-based computers.
2026-05-12, ∼156🔥, 0💬

What Is ca-certificates-java Package
This section describes the 'ca-certificates-java' package, which installs trusted root CA certificates in JKS format supporting Java applications.
2026-05-12, ∼155🔥, 0💬

"update-ca-certificates" to Add CA Certificate
This section provides a tutorial example on how to use the update-ca-certificates Command to add a new root CA certificate to the trust store on Linux systems.
2026-05-12, ∼155🔥, 0💬

Using pyOpenSSL for HTTPS Connection
This section provides a tutorial example on using the OpenSSL.SSL module to create an HTTPS connection.
2026-05-06, ∼155🔥, 0💬

"update-ca-certificates" vs "trust" on Debian/Ubuntu Computers
This section describes the differences between 'update-ca-certificates' and 'trust' commands on Debian/Ubuntu computers.
2026-05-12, ∼154🔥, 0💬

What Is update-ca-trust Command
This section describes what is 'update-ca-trust' - a system command to maintain certificate Trust Store on Red Hat-based (RHEL, CentOS, and Fedora) computers.
2026-05-12, ∼153🔥, 0💬

"update-ca-trust" to Add CA Certificate
This section provides a tutorial example on adding new CA certificates to Trust Store using the 'update-ca-trust' command on Red Hat-based computers.
2026-05-12, ∼153🔥, 0💬

"trust list" - Search Certificates in Linux Trust Store
This section provides tutorial examples on searching certificates in Linux Trust Store using the 'trust list' command.
2026-05-12, ∼151🔥, 0💬

update-ca-trust Command on Red Hat Computers
This chapter provides tutorial notes and example codes on the 'update-ca-trust' command Red Hat computers. Topics include directory structure of the Trust Store; adding or disabling CA certificates.
2026-05-12, ∼149🔥, 0💬

Testing OpenSSL with fsockopen()
This section provides a tutorial example on how to test the PHP OpenSSL module with the fsockopen() function, which allows you to open a socket connection to a remote computer with the regular TCP protocol or the secure TLS protocol.
2022-11-01, ∼146🔥, 0💬

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