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Email Messages with Attachments using MIME
This section provides an email message example with an attachment using the MIME (Multipurpose Internet Mail Extensions) protocol. The message is divided into multiple parts with each part using different content type.
2022-06-03, 165👍, 1💬

💬 2022-06-03 test: thank

Installing Crypt::SSLeay 0.72 on Windows
This section provides a tutorial example on how to install Crypt::SSLeay 0.72 for ActiveState Perl on Windows systems.
2022-04-01, 2148👍, 2💬

💬 2016-05-05 rodman: Thanks I sure hope this helps me.

Exporting Root Certificate to File from macOS
This section provides a tutorial example on how to export a trusted root CA certificate pre-installed on macOS computer into a certificate file in binary .cer format.
2022-01-30, 663👍, 2💬

💬 2022-01-30 Herong: Johan, Thank you so much for sharing this!

💬 2022-01-29 Johan: A better way to do the export programatically and avoid GUI clicking is to use the "security" program and export the root- and s...

Viewing Pre-Installed Certificates in Mozilla Firefox
This section provides a tutorial example on how to view pre-installed certificates in Mozilla Firefox. View certificate button is on the Encryption tab of the Advanced option page.
2022-01-09, 421👍, 2💬

💬 2022-01-09 Herong: Straton, Certificates in the Authorities section are trusted root certificates. Deleting them will create problems visiting Webs...

💬 2022-01-06 Straton: Looking for information on what the Authorities section tells me: why would I care? What is it useful for? Why would I delete ex...

Usage Examples of Public Key Infrastructure
This section provides some usage examples of PKI (Public Key Infrastructure), like HTTPS (Hypertext Transfer Protocol Secure) protocol, digital signature, encryption of documents, digital identification.
2021-12-27, 5612👍, 6💬

💬 2021-09-23 Kuro: nice

💬 2019-05-14 dsdsdasd: Naaaaa

💬 2017-11-30 naveed: nice!!

💬 2017-09-28 Irtza: ok

Valid Certificate Required in Outlook
This section describes how to request digital signature and encryption when sending an outgoing email message in MS Office Outlook 2007. An invalid certificate error message shows up if you don't have any personal certificate that matches your email address and is issued from a trusted root CA.
2021-05-14, 626👍, 1💬

💬 2021-05-14 georgepaul: Office 365 Email signature generator - Sigsync Office 365 Email Signature software allows you to have full control over your org...

Archived: Windows XP Component "Update Root Certificates"
This section describes the process used by Windows XP component, Update Root Certificates, to communicate to Windows Update Website to fetch a trusted root certificate and install in on the local computer automatically.
2020-06-08, 5441👍, 4💬

💬 2020-06-08 Herong: Onur, If the error is cause by IE auto-updating root certificate, you can download and install the missing root certificate manu...

💬 2020-06-01 Onur: Hi there, Since last a few weeks, although I have XP SP3 and the most recent crypt32.dll versioned 5.131.2600.6459, I get numero...

💬 2019-04-13 Herong: Leo, can you run the "certmgr" command on your Windows XP? It provides functions to install root certificates to your computer.

💬 2019-04-08 Leo: I know this article is outdated, but I'm still looking for a way to update the 'Root certificates' in Windows XP SP3, by install...

Windows Automatic Root Update Mechanism
This section describes the automated process used by Windows to communicate to Windows Update Website to fetch a trusted root certificate and install it on the local computer, whenever the root certificate is needed.
2020-06-08, 1608👍, 2💬

💬 2020-06-08 Herong: Onur, the question at the end of your comment was not very clear. Can you rephrase it in a different way?

💬 2020-06-05 Onur: Actually, this auto update mechanism is present on older Windows versions as low as XP. See the article here on this site: Outda...

Configuring PHP OpenSSL on Windows
This section provides a tutorial example on how to install and configure the PHP OpenSSL module on Windows systems. PHP OpenSSL is provided as a DLL file called php_openssl.dll.
2020-05-21, 52085👍, 14💬

💬 2020-05-21 Herong: GHM, can you check if php_openssl.dll actually exists in the extension_dir folder?

💬 2020-05-19 GHM: I am totally new to php. How do I activate openssl so php can access functions. I installed php manager and it said that php_ope...

💬 2020-01-21 Herong: Nietzsche, can you provide the logic for the hasMeaning() function?

💬 2020-01-12 Nietzsche: Life is Meaningless: Input 1: if (Life::hasMeaning(self) === True) { echo "Life has Meaning"; } else { echo "Life is Meaningless...

💬 2019-10-09 Michael: Thank you! This helped me enable SSL on my PHP install

(More comments ...)

HTTPS Request and Response Example
This section describes an example of HTTPS request and response captured by a Perl script using the Crypt::SSLeay module.
2020-04-29, 3364👍, 3💬

💬 2020-04-29 james: alert('cum')

💬 2019-07-13 xss: HI

What Is HTTPS (Hypertext Transfer Protocol Secure)?
This section describes what is HTTPS (Hypertext Transfer Protocol Secure) - A communication protocol that uses the HTTP and the SSL/TLS protocols to provide encrypted communication and secure identification of a Web server.
2019-04-13, 726👍, 2💬

💬 2019-04-13 Herong: Maybe some other website did it, not my site. ☺

💬 2019-04-10 arlyneysiak@gmail.com: Your site erased my entire history. I'd like to get my history information back. Can you tell me how to do this. I would greatly...

Archived: IE 8 Displaying Certificate Error Page
This section provides a tutorial example showing that IE 8 fails to validate an HTTPS server certificate and displays a certificate error page.
2018-10-06, 516👍, 2💬

💬 2018-10-06 Herong: Onur, Maybe the auto-install root CA certificate function has been turned off on your Win7 system. But you can always do it manu...

💬 2018-09-25 Onur: I use IE8 with Win7 x64 and i got SSL certificate error while accessing sites issued with Digicert Global Root CA "G2" certifica...

HTTPS Communication Data Encryption
This section describes the HTTPS communication data encryption process - Browser generates an encryption key, encrypts it using server public key and sends it to the server; Browser encrypts data with the encryption key; Server encrypts return data with the same encryption key.
2018-09-06, 166👍, 2💬

Creating a Digital ID and Sign Word Documents
This section provides a tutorial example on how to create a your own digital ID and use it to add a digital signature to a MS Word 2007 document.
2018-03-25, 2985👍, 2💬

💬 2018-03-15 Herong: Laurenson, Word 2013 has removed the function to create your own test digital ID. You can go to Comodo to get real digital ID fo...

💬 2018-03-13 Laurenson: this is very helpful but I want to know how to create my own digital ID using Microsoft Office 2013

Exporting a List of Root CA Certificates
This section provides a tutorial example on how to export a list of trusted root CA certificates with the certificates console on a Windows system.
2018-03-13, 2221👍, 2💬

💬 2018-03-13 Michael Knoy: Finally someone who knows their shit! Over 20 years on the net and you have some of the best straight forward info. Thank You Ve...

💬 2017-03-28 Josh: Just what I needed. Thank you!

Introduction of HTTPS (Hypertext Transfer Protocol Secure)
This chapter provides a quick introduction of HTTPS (Hypertext Transfer Protocol Secure). Topics include what is HTTPS; Web server authentication; communication data encryption.
2017-11-15, 3168👍, 3💬

💬 2017-11-15 amal: third visit

💬 2016-04-29 amal: second visit

💬 2016-04-29 amal: first visit

Full Version in PDF/EPUB
Information on how to obtain the full version of this book in PDF, EPUB, or other format.
2017-07-01, 2758👍, 12💬

💬 2017-04-21 Herong: Dzung, you should have it in your email box now. Thanks.

💬 2017-04-20 Dzung Nguyen: Dr. Herong; I really enjoy your books. I donated $5 through PayPal. Would you let me know where I can download this PKI Tutorial...

💬 2016-12-06 zhaojie: thanks,i'm learning http ,so to know https !

💬 2016-10-18 ItslSteven: thanks

💬 2016-08-17 Herong: billm, please send me an email. Thanks.

(More comments ...)

Using openStream() Method in java.net.URL Class
This section provides a tutorial example on how to use the openStream() method in the java.net.URL class to perform a GET method on an HTTPS server. Java Secure Socket Extension (JSSE) works quietly behind the java.net.URL class to provide HTTPS support.
2017-05-23, 1803👍, 2💬

💬 2017-05-23 Herong: Mike, the issue could be that Yahoo Finance server is expecting some standard HTTP request headlines this Java program is not pr...

💬 2017-05-22 Mike: when I run the above java program with the following argument, I got a 401. If I directly paste the same https link to a web bro...

Listing of Trusted Root CA in Google Chrome
This section provides a tutorial example on how to see the list of trusted root CA (PKI Authorities) pre-installed in Google Chrome.
2016-09-16, 10577👍, 1💬

💬 2016-09-16 Pooja Shukla: good

Digital Signature Scheme for Email Messages
This section describes the digital signature scheme for email messages. The process of signing an email message is the same as signing other digital documents.
2016-09-08, 1117👍, 1💬

💬 2016-09-08 shradha: nice one

Testing OpenSSL with fopen()
This section provides a tutorial example on how to test the PHP OpenSSL module with the fopen() function to run a GET request on an HTTPS server.
2016-03-25, 105👍, 1💬

Introduction of PKI (Public Key Infrastructure)
This chapter provides a quick introduction of PKI (Public Key Infrastructure). Topics include what is PKI; usage examples of PKI; most popular certificate authorities.
2016-02-22, 2476👍, 2💬

💬 2016-02-22 Charlie Beebout: Thank you. I am looking forward to familiarizing myself with security issues.

Converting KeyStore Files to PKCS12 Files
This section provides a tutorial example on how to convert a KeyStore file to a PKCS12 file, because Windows 'Internet Options' can import keys and certificates from PKCS12, but not from KeyStore file.
2016-02-07, 1632👍, 2💬

💬 2016-02-07 Herong: Steve, Fully agree! I put it in command line, because it is easier to document. I will put a warning the tutorial.

💬 2016-02-07 Steve: Hi! No password in command line , please ! Can be read in history... Bad practice :(

PKI Tutorials - Herong's Tutorial Examples
This tutorial book is a collection of notes and sample codes written by the author while he was learning PKI (Public Key Infrastructure) technologies himself. Topics include Root CA (Certificate Authorities); SSL, TLS, and HTTPS; Server and client authentication processes; Communication data encrypt...
2016-02-07, 10168👍, 1💬

💬 2016-02-07 john: thanks!

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