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What Is Cryptography?
This section describes what is cryptography - The study of techniques related to all aspects of data security.
2021-04-25, 2725👍, 6💬

💬 2021-04-25 jlong: thanks

💬 2017-02-18 gabu: ggoodd

💬 2016-11-17 mohamed: yes

💬 2015-10-20 Herong: Hi Ian, the Rail Fence cipher is very simple example of encryption we can do manually. See the Transposition cipher page at wiki...

💬 2015-10-19 Ian T. Lee: Can you give me a simple example of how to do cryptography manually?

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AES Standard Decryption Algorithm
The standard decryption algorithm of the AES-128 encryption is provided. It is a straightforward reverse of the encryption algorithm.
2021-04-25, 114👍, 1💬

The Constancy of the Speed of Light
This section provides a thought experiment to help understanding the second assumption of the special theory of relativity: The constancy of the speed of light.
2021-04-25, 595👍, 25💬

💬 2021-04-25 Hiroji kurihara: Constancy of speed of light (Reexamination) Constancy of speed of light is not possible always. No, it will be possible limitedl...

💬 2021-04-04 Hiroji kurihara: Space and time will be absolute (a supposition) Perhaps, space and time each will be absolute. Each will not be affected by any ...

💬 2021-03-01 Hiroji kurihara: Apology It seems that my previous post (February 28) was not valid thought experiment. Sorry for that. But, how about if uniform...

💬 2021-02-28 hiroji kurihara: Aether is real There are words : solar apex and solar antapex. Following is a related thought experiment. In outer space, there ...

💬 2021-02-21 Hiroji kurihara: Speed of light (a thought experiment) Descartes said like this, "divide the difficulties". The formula for sound Doppler effect ...

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Merge Sort - Implementation in PHP
This section provides a tutorial on how to implement the Merge Sort algorithm in PHP.
2021-04-24, 152👍, 2💬

💬 2021-04-24 Herong: Hubert, good point. Thanks!

💬 2021-04-20 Hubert Christiaen: The argument called toIndex is not the highest index of the array as the name suggests, but the number of elements. Hence the fo...

Validating wsse:Password Digest String
This section provides a tutorial example on how the SOAP message receiver should validate the password digest string in the wsse:Password element using the 'Password_Digest = Base64 ( SHA-1 ( nonce + created + password ) )' definition.
2021-04-24, 13673👍, 12💬

💬 2021-04-24 Herong: sindhu, to what format do you want the XSLT to transform?

💬 2021-04-09 sindhu: Is XSLT example available for this?

💬 2019-12-08 Herong: If you are getting "SjUQn7b8qSr5x4WOg9YLieSe2to=" as the password digest value, please see Kumar's comment below.

💬 2019-12-03 did: Hi! I tested manually the algorithm using cryptii.com, and I get the value "SjUQn7b8qSr5x4WOg9YLieSe2to=", not the value "PfZyE8...

💬 2019-06-16 Herong: JOlivas, Thanks for sharing your PHP code examples!

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"keytool" and "keystore" from JDK
This chapter provides tutorial notes and example codes on 'keytool' and 'keystore'. Topics include introduction of 'keytool' and 'keystore'; using 'keytool' to generate private keys, generate self-signed certificates, export and import certificates.
2021-04-23, 127👍, 1💬

💬 2021-04-23 chanho.song: wow. I'm Korean. Thank u so much.

"regedit.exe" - Changing Registry Values
This section provides a tutorial example on how to change registry values for the FreeCell game program, like increase the total number of games won.
2021-04-22, 1254👍, 5💬

💬 2021-04-22 E. Jean: Worked perfectly Thnks a lot!

💬 2020-02-25 Herong: Bill, I am not sure if there is registry value for that on Windows XP. Newer versions of Windows do not put FreeCell settings in...

💬 2020-02-23 bill: Is there a reg edit that would allow the games to play in numerical order automatically

💬 2017-02-16 Herong: Johnny, The example given in this tutorial was based on Windows XP. FreeCell registry key will be at different locations in othe...

💬 2017-02-11 Johnny Jevidetti: What version of Windows are you using? Trying the steps you have outlined, my regedit is much different than the one you describ...

Blowfish Decryption Algorithm
This section describes the Blowfish decryption algorithm, which is identical to the encryption algorithm step by step in the same order, only with the sub-keys applied in the reverse order.
2021-04-18, 435👍, 2💬

💬 2021-04-18 Peter: $2b$10$fhC6bHFpfs/texxDk1.QJu5ngSPwp pWz7vKseeZS9zhM2y7V5gevWr

Looping through ResultSet with res.next()
This section describes how to loop through ResultSet objects with the res.next() method.
2021-04-18, 225👍, 1💬

Using java.net.HttpURLConnection to Send SOAP Messages
This section describes steps to follow if you want to use the java.net.HttpURLConnection class to send out a SOAP XML message.
2021-04-15, 41976👍, 14💬

💬 2018-12-21 Herong: RAS, Yes. That's a good example on sending a file as a SOAP attachment. I thought you were looking for example on sending files ...

💬 2018-12-18 RAS: Thanks Dr. Herong for your reply. I've gone through the link you've shared but in that way, there's no way to pass other paramet...

💬 2018-12-18 Herong: RAS, Sending (or uploading) files from a client depends what how the server want to receive them. If the server support multipar...

💬 2018-12-17 RAS: Thanks Dr. Herong for the link but I'm not able to convert it to a sample codeset. Can you help me with it?

💬 2018-12-16 Herong: RAS, if you want to send a file with HTTP POST method, check RFC 1867 - Form-based File Upload in HTML.

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Zoom In and Out on PyMol
This section provides a tutorial on how to zoom in and out the viewing window on PyMol.
2021-04-15, 157👍, 1💬

What Is Key Encoding?
This section describes private and public key encoding standards: PKCS#8 is used for encoding private keys and X.509 is used for encoding public keys.
2021-04-15, 1307👍, 3💬

💬 2021-04-15 omg: nice

💬 2019-07-24 Vivek: yo sup

Item Listener on Radio Button Menu Items
This section provides a tutorial example on how to use java.awt.event.ItemListener, radio button and check box item listener interface, to catch state changed item vents on radio button menu item objects.
2021-04-13, 122👍, 1💬

Calculate Double-SHA256 Hash with Python
This section describes how to calculate Double-SHA256 hash with Python.
2021-04-11, 424👍, 2💬

💬 2021-04-11 Max: Great Reference with HEX base, thanks

Downloading and Installing Visual C# 2010 Express
This section provides a tutorial example on how to download and install Microsoft Visual C# 2010 Express edition on Windows systems.
2021-04-10, 5671👍, 28💬

💬 2021-04-10 ali: thx

💬 2020-11-15 tang: good

💬 2020-10-04 asdasdasd: dsadsd

💬 2020-09-29 aidan: meaningful comments

💬 2020-09-26 qijidong: good

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Comments on Herong's Tutorial Books
Please share your general comments on my tutorial books here. Comments should not contain hyperlinks to any external Web sites.
2021-04-08, 64618👍, 189💬

💬 2021-04-08 Hahaha: Adam is a hacker

💬 2019-02-15 Julia: Nice website!

💬 2017-01-05 SOOZEE PALAMINOV: Dr. Herong ... I am super IMPRESSED with this website ... I found it by accident ... Greatly appreciated and Thank You very Much...

💬 2016-02-12 krishna: type conversion topic with example: [URL removed]

💬 2016-01-17 Herong: @EnigmaVariation0, The current year, 2016 CE (Common Era), also called AD (Anno Domini) 2016) is Chinese AH (Anno Huángdì) 4713....

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UTF-16LE Encoding
This section provides a quick introduction of the UTF-16LE (Unicode Transformation Format - 16-bit Little Endian) encoding for Unicode character set. UTF-16LE is a variation of UTF-16.
2021-04-06, 13224👍, 11💬

💬 2021-04-06 phuc: Thanks

💬 2021-03-21 Herong: wqeq, what system are you using when posting your comment?

💬 2021-03-15 wqeq: 瑣筦㈰摢㠴㈶㌷㈰㌶㈶㡥㙡㘹挱㍤〳㠳㈱㜰挳〵慦㔷戹㈴戰攱愷ㄱ㉡㍣扡㄰〳੽

💬 2021-03-07 Somphoth Boby Siratsamy RBY740: If b were -1 and a is 7, 7-(-1)= 8 now if we were to square 7-(-1), it would equal 64 now if we were to [] 7-(-1[])to the square...

💬 2020-09-02 xx: good

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Site Map
Tutorial Books on Software Programming Android Tutorials - Herong's Tutorial Examples ASP Tutorials - Herong's Tutorial Examples C# Tutorials - Herong's Tutorial Examples Data Encodings - Herong's Tutorial Examples Flash Tutorials - Herong's Tutorial Examples Free Web Services - Herong's Tutorial Ex...
2021-04-06, 5823👍, 0💬

Lucky Wedding Dates: 2019 - Year of the Boar
Where to find lucky wedding dates for year 2019? Lucky Wedding Dates: 2019 - Year of the Boar   ⇒ Lucky Wedding Dates: 2020 to 2031 ⇐ Lucky Wedding Dates: 2018 - Year of the Dog ⇑ Lucky Wedding Dates: 2008 to 2019 ⇑⇑ Wedding Date - The Most Important Date of Your Life
2021-04-04, 354👍, 0💬

Lucky Wedding Dates: 2017 - Year of the Rooster
Where to find lucky wedding dates for year 2017? Lucky Wedding Dates: 2017 - Year of the Rooster   ⇒ Lucky Wedding Dates: 2018 - Year of the Dog ⇐ Lucky Wedding Dates: 2016 - Year of the Monkey ⇑ Lucky Wedding Dates: 2008 to 2019 ⇑⇑ Wedding Date - The Most Important Date of Your Life
2021-04-04, 329👍, 0💬

Lucky Wedding Dates: 2018 - Year of the Dog
Where to find lucky wedding dates for year 2018? Lucky Wedding Dates: 2018 - Year of the Dog   ⇒ Lucky Wedding Dates: 2019 - Year of the Boar ⇐ Lucky Wedding Dates: 2017 - Year of the Rooster ⇑ Lucky Wedding Dates: 2008 to 2019 ⇑⇑ Wedding Date - The Most Important Date of Your Life
2021-04-04, 321👍, 0💬

Get Free Ether from faucet.metamask.io
This section describes how to get some free Ether form faucet.metamask.io.
2021-03-27, 11701👍, 10💬

💬 2021-03-27 Herong: Yes, you can use test Ether to test smart contract.

💬 2021-03-23 nvs: can we use it to test smartcontract sir? thank you sir by the way

💬 2020-10-10 Herong: venkatesh, test Ether has no real value. So there is no way to convert it to real Ether.

💬 2020-10-08 venkatesh: Can we convert test ethereum to real ethereum

💬 2020-08-15 Herong: sb, Minereum Airdrop is closed now. But it was real.

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"WinZip" - ZIP File Compression Tool
This chapter provides an introduction of WinZip. Topics include installing WinZip 10.0, adding files and sub directories to ZIP files, extracting files from ZIP files, setting passwords to ZIP files, setting Windows Explorer context menu for WinZip.
2021-03-26, 106👍, 1💬

Windows Tutorials - Herong's Tutorial Examples
This free book is a tutorial book for regular users of Windows systems. It is a collection of tutorial notes written by the author while he was learning and using Microsoft Windows systems. Key words include FTP, Network, Graphics, HijackThis, Internet Explorer, WinZIP, WinRAR, Process, Service, Spy...
2021-03-26, 212👍, 1💬

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