This book is a collection of notes and sample codes written by the author while he was learning email systems. Topics include email message transmission protocols: SMTP, IMAP, POP3; secure connections with SSL/TLS protocols; managing Postfix server as MSA, MTA and MDA agents; managing Dovecot server for email retrieval with IMAP and POP3 protocols; Thunderbird and other email client tools. Updated in 2024 (Version v1.03) with minor updates. For latest updates and free sample chapters, visit https://www.herongyang.com/Email.

This book is a collection of notes and sample codes written by the author while he was learning Linux systems. Topics include using Cockpit Web portal for admin tasks; managing users and groups; managing files and directories; managing NTFS, CIFS, EXT4, LBA, LVM file systems; using network tools and security firewall; installing CentOS systems; using SELinux (Security-Enhanced Linux) system; DNF/YUM software package manager; SSH Server configuration and client tools; managing vsftpd - Very Secure FTP daemon; managing directory service with OpenLDAP; Updated in 2024 (Version v5.44) with email topics moved to 'Email Tutorials' book. For latest updates and free sample chapters, visit https://www.herongyang.com/Linux.

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 encryption; Using HTTPS with Chrome, Firefox, Edge, Safari and Internet Explorer; Managing certificates on Windows, macOS, iOS and Android systems; X.509 certificate format; Certificate store and management tools; Certificate validation chain; Self-signed certificate and CSR; Digital signature on MS Word and OpenOffice documents; Get free personal certificate from Comodo. Updated in 2022 (Version v2.31) with macOS and Safari tutorials. For latest updates and free sample chapters, visit https://www.herongyang.com/PKI.

This PHP tutorial book is a collection of notes and sample codes written by the author while he was learning PHP himself. Topics include PHP script syntax; data types, variables, array, expressions, statements and functions; Web server integration; HTTP requests and controlling HTTP responses; sessions, cookies, and file uploads/downloads; MySQL database server access; files, directories, and ZIP archives; parsing HTML Documents; processing image files; SOAP extension; managing non-ASCII characters; classes and objects; using PHP on Windows, macOS and Linux; executing external programs on operating system. Updated in 2022 (Version v5.16) with minor changes. For latest updates and free sample chapters, visit https://www.herongyang.com/PHP.

This book is a collection of notes and sample codes written by the author while he was learning Linux applications. Topics include using managing users and groups; managing files and directories; managing Apache Web server and SquirrelMail; managing MySQL server; developing Python and PHP scripts; using GCC C/C++ compilers; running graphical applications on GNOME desktop and X11 servers; running Conda - Environment and Package Manager. Updated in 2023 (Version v1.02) with minor updates. For latest updates and free sample chapters, visit https://www.herongyang.com/Linux-Apps.

This book is a collection of tutorial notes and example codes written by the author while he was learning different data encoding algorithms. Topics include introduction of data encoding algorithms: Base32, Base64, UUEncode; Base64 Encoding Algorithm with W3C Implementation; Base64 Encoding tools and API in Java, Python, PHP and Perl; Base67URL Encoding to be URL and Filename safe; Base32 Encoding Algorithm with Java, PHP and C++ Implementations; URI/URL encoding with Java and PHP example programs; application/x-www-form-urlencoded encoding with Java and PHP example programs; UUEncode Encoding Algorithm with Sun Implementation. Updated in 2023 (Version v5.23) with minor changes. For latest updates and free sample chapters, visit https://www.herongyang.com/Encoding.

This VBScript tutorial book is a collection of notes and code samples written by the author while he was learning VBScript (Visual Basic Scripting Edition) himself. Topics include: The Variant Data Type with Subtypes; Fixed-Size and Dynamic-Size Arrays; Function Arguments Passed by References and by Values; Raising and Catching Runtime Errors; Regular Expression and Pattern Match; Runtime DLL Library: Dictionary, File System, and File I/O; Defining Classes with Properties and Default Method; Object Initializing and Terminating Processes; Client-Side Scripting: VBScript Code for IE Browser; Server-Side Scripting: VBScript code for IIS Server; System Admin Scripting: Windows Script Host (WSH). Updated in 2024 (Version v6.03) with minor changes. For latest updates and free sample chapters, visit https://www.herongyang.com/VBScript.

This tutorial book is a collection of notes and sample codes written by the author while he was learning Java Swing and AWT himself. Topics include Swing and AWT (Abstract Windows Toolkit) class library; graphical components: JButton, JCheckbox, JComboBox, JFrame, JLabel, JMenu, JRadioButton, JTextField; frame layouts; menus; dialog boxes; editor pane; Unicode and Chinese. Updated in 2024 (Version v4.32) with JDK 20. For latest updates and free sample chapters, visit https://www.herongyang.com/Swing.

This cryptography tutorial book is a collection of notes and sample codes written by the author while he was learning cryptography technologies himself. Topics include MD5 and SHA1 message digest algorithms and implementations, DES, Blowfish and AES secret key cipher algorithms and implementations, RSA and DSA public key encription algorithms and implementations, Java and PHP cryptography APIs, OpenSSL, keytool and other cryptography tools, PKI certificates and Web browser supports.Updated in 2019 (Version Version 5.40) with Java 12. For latest updates and free sample chapters, visit http://www.herongyang.com/Cryptography.

This Perl tutorial book is a collection of notes and sample codes written by the author while he was learning Perl language himself. Topics include introduction of ActivePerl; data types, variables and expressions; scalars, arrays, hash maps, and references; input/output and file systems; DBM files and MySQL access; socket communication; generating executables; XML::Simple and RPC:XML modules; LWP::UserAgent, HTTP::Request and SOAP::Lite modules; CGI, and IIS/Apache integrations. Updated in 2024 (Version v6.02) with minor updates. For latest updates and free sample chapters, visit https://www.herongyang.com/Perl.