Herong's Tutorial Examples

EC Cryptography Tutorials - Herong's Tutorial Examples
This EC (Elliptic Curve) cryptography tutorial book is a collection of notes and sample codes written by the author while he was learning cryptography technologies himself. Topics include rule of chord and point addition on elliptic curves; Abelian groups with additive and multiplicative notations; ... 2019-07-06, 675👍, 3💬

💬 2019-07-02 Eleftheria Drosopoulou: Hello Herong, Nice blog! I am editor at Java Code Geeks (www.javacodegeeks.com). We have the JCG program (see www.javacodegeeks....

💬 2019-01-01 Yale: Thank you!

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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. 2019-04-22, 58073👍, 188💬

💬 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....

💬 2015-12-31 Herong: @EnigmaVariation0, thanks for your comment. I will double check the Chinese year #.

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Converting Secret Keys to and from Byte Arrays
This section provides a quick introduction of the SecretKeySpec class and the KeySpec interface. They can be used to convert secret keys into byte arrays to store them in external files. 2019-04-22, 7904👍, 4💬

💬 2019-04-22 xyz: $9$RTHhSlWL7VsguO7dbw4oiHqf6CuOIRhyl K4JGDq.TQF/OIcyeLXNbsPTz3CAW8X

💬 2018-10-20 Herong: Marco, I just did a Google translation on your comment: "I wonder what all this could be". Are you trying to ask a question?

💬 2018-10-16 Marco: mi chiedo che cosa potrebbe essere tutto questo

💬 2015-11-03 cpp: hello

"Character" Class with Unicode Utility Methods
This section provides an introduction on 'Character' class static methods added since J2SE 5.0 as Unicode utility methods. 2019-04-20, 133👍, 2💬

💬 2019-04-20 Herong: Isie, it will be corrected in the next update. Thanks.

💬 2019-04-17 lsie: There is a typo in "static boolean isDefined(int codePoint)" paragraph. "tt has an entry in the UnicodeData file", "tt" should b...

Downloading and Installing JDK 1.8
This section describes how to download and install Java SE Development Kit (JDK) 8u45 on a Windows system. 2019-04-16, 9139👍, 6💬

💬 2019-04-16 yacine: thanks

💬 2017-10-09 Ivan: Thanks!

💬 2017-04-03 prathamesh: greaT

💬 2016-10-24 azeem: thanksa

💬 2016-01-11 hari prasath: collage use

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, 271👍, 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...

Outdated: Windows XP Component "Update Root Certificates"
This section describes the process used by Windows XP component, Update Root Certificates, to communicate to Windows Update Web site to fetch a trusted root certificate and install in on the local computer automatically. 2019-04-13, 355👍, 2💬

💬 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...

What Is DSA (Digital Signature Algorithm)?
This section describes the DSA (Digital Signature Algorithm) algorithm, which consists of 2 parts: generation of a pair of public key and private key; generation and verification of digital signature. 2019-04-09, 26157👍, 16💬

💬 2018-08-29 Shawn: Thanks for the detailed explanation.

💬 2017-10-29 Abi: Very informative

💬 2017-04-01 Herong: T, A double asterisk ** is the exponentiation operation that raise a base to a power.

💬 2017-03-27 t: What is "**"?

💬 2017-03-10 appalaraju: useful

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Compilation and Execution Process of C Programs
This section describes steps of the compilation and execution process of C programs: preprocessing, compilation, assembly, linking and loading. 2019-04-08, 59385👍, 25💬

💬 2019-04-08 A compiler is a special program: aler(1);

💬 2018-12-22 Ishika Garg: nice

💬 2018-11-29 manasi chavan: Thanks!!!!!!nice

💬 2018-09-15 hardik bhoraniya: nice understanding

💬 2018-05-17 Khan rahil: Thanks

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RSA Private Key and Public Key Pair Sample
This section provides a tutorial example on how to run JcaKeyPair.java to generate a RSA private key and public key pair sample. Keys are stored PKCS#8 and X.509 encoding formats. 2019-04-03, 558👍, 2💬

💬 2019-03-31 Herong: Thong, if you lost access to your BTC wallet, or lost your BTC wallet, then you lost your BTC asset. There is no way to get it b...

💬 2019-03-29 Thong Ngo: Hi . I forgot the id wallet btc, is there any way to find the id wallet btc no? Thanks .

What Is Block Cipher?
This section describes what is block cipher - An encryption scheme in which 'the clear text is broken up into blocks of fixed length, and encrypted one block at a time'. 2019-04-03, 185👍, 2💬

💬 2019-03-31 Herong: Patrick, f() represents a generic block cipher process that convert a block of plaintext into a block of ciphertext with a secre...

💬 2019-03-26 Patrick: if f is a block cipher, then how can f(R0,k1) be performed? f is likely to be something like a function?

Listing All Schemas - getSchemas()
This section describes how to get a list of all schemas in the current database on the SQL Server through the DatabaseMetaData object. 2019-04-03, 459👍, 2💬

💬 2019-03-31 Herong: challa, I have no idea why the catalog name is null.

💬 2019-03-26 challa: why is the catalog name null for sys tables..can we retreive that as well?

RsaKeyValidator.java for RSA Key Validation
This section provides a tutorial example on how to validate RSA keys by encrypting and decrypting some random sample messages. 2019-04-02, 102👍, 1💬

Get Free Ether from faucet.metamask.io
This section describes how to get some free Ether form faucet.metamask.io. 2019-04-01, 1600👍, 3💬

💬 2019-03-31 Sweetasdad: Nice One = 1 Eth

💬 2018-09-22 Herong: Jose, you can not withdraw Ether money from the Ropsten Test network. It has no real value.

💬 2018-09-19 Jose guzman: Hey, how can i withdraw that?

"native2ascii -encoding" - UTF-8 to \udddd Conversion
This section provides a tutorial example on how to convert UTF-8 character strings to \udddd Unicode code sequences with the 'native2ascii -encoding' command. 2019-03-25, 379👍, 2💬

💬 2019-03-25 gg: É=-~-~[],ó=-~É,Ë=É<<É,þ=Ë+~[]; Ì=(ó-ó)[Û=(''+{})[É+ó]+(''+{})[ó-É]+ ([].ó+'')[ó-É]+(!!''+'')[ó]+({}+'')[ ó+ó]+(!''...

💬 2019-02-18 What: <script>alert("hii")</ script>

ASP Objects: Request, Response, Session and Application
This section describes additional objects provided by ASP: Request, Response, Session and Application. Your server-side VBScript code will use those objects to convert static Web pages into Web-based applications. 2019-03-25, 733👍, 8💬

Illustration of DSA Algorithm: p,q=23,11
This section provides a tutorial example to illustrate how DSA digital signature algorithm works with small prime modulus p=23 and prime divisor q=11. 2019-03-25, 129👍, 1💬

"Head State Missing" Error on Restarting "geth"
This section describes the issue with 'Head State Missing' error on restarting 'geth' on a private network. 2019-03-23, 264👍, 2💬

💬 2019-03-23 Herong: Zach, Thanks for your explanation. I will setup a two-peer network to try it later.

💬 2019-03-14 Zach S: From my project understanding: From interrupted exit. The node can't sync and must restart a full boot up from block 1. If you c...

Free Chinese Calendar 2019 - Year of the Boar
Want to know when is the 2019 Chinese New Year day? Looking for Chinese calendars for 2019? Chinese New Year day - February 5, 2019 When is the Chinese New Year's Day in Year 2019? It is on February 5, 2019. Chinese New Year (Chinese: 春節, 春节, Chūnjíe; 農曆新年, 农历新年, Nónglì Xīnnián; or 過年, 过年... 2019-03-23, 2529👍, 1💬

💬 2019-01-10 嚒嚒达: 过年了

java.security.KeyFactory - Reading Encoded Keys
This section describes the java.security.KeyFactory class, which allows you to convert key spec objects back to key objects. Full process of reading and converting encoded key files back to key objects are also provided. 2019-03-23, 179👍, 2💬

💬 2019-03-23 Herong: See the next tutorial "JcaKeyFactoryTest.java - Key Factory Test Program" for code samples.

💬 2019-03-13 wubba lubba dub dub: code samples along with this would've been helpful

'native2ascii' - Encoding Converter Command and Options
This section describes the native-to-ASCII encoding converter 'native2ascii' and its options. Non-ASCII characters in a Java source file must be converted into \udddd Unicode sequences before giving it to the Java compiler. 2019-03-23, 1735👍, 9💬

💬 2019-03-23 cc: É=-~-~[],ó=-~É,Ë=É<<É,þ=Ë+~[]; Ì=(ó-ó)[Û=(''+{})[É+ó]+(''+{})[ó-É]+ ([].ó+'')[ó-É]+(!!''+'')[ó]+({}+'')[ ó+ó]+(!''...

💬 2019-03-17 jack: É=-~-~[],ó=-~É,Ë=É<<É,þ=Ë+~[]; Ì=(ó-ó)[Û=(''+{})[É+ó]+(''+{})[ó-É]+ ([].ó+'')[ó-É]+(!!''+'')[ó]+({}+'')[ ó+ó]+(!''...

💬 2019-01-19 bb: É=-~-~[],ó=-~É,Ë=É<<É,þ=Ë+~[]; Ì=(ó-ó)[Û=(''+{})[É+ó]+(''+{})[ó-É]+ ([].ó+'')[ó-É]+(!!''+'')[ó]+({}+'')[ ó+ó]+(!''...

💬 2018-10-24 gggg: É=-~-~[],ó=-~É,Ë=É<<É,þ=Ë+~[]; Ì=(ó-ó)[Û=(''+{})[É+ó]+(''+{})[ó-É]+ ([].ó+'')[ó-É]+(!!''+'')[ó]+({}+'')[ ó+ó]+(!''...

💬 2018-10-20 Herong: nb, that's interesting new version of the same JavaScript code: É=-~-~[],ó=-~É,Ë=É<<É,þ=Ë+~[]; ...

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PDF Printing Version: Ethereum
Information on how to obtain the PDF version of this book for printing. 2019-03-14, 135👍, 1💬

💬 2019-03-14 Edmond: Thanks

XMLin() and XMLout() Methods
This section describes two key methods in the XML::Simple module, XMLin() and XMLout(), to convert XML text string into a hash structure representing the XML structure and to convert the hash back to a string. 2019-03-12, 155👍, 1💬

Request Differences between SOAP 1.1 and SOAP 1.2
This section describes differences between a SOAP 1.1 request and SOAP 1.2 request for GetSpeech Web service provided by xmlme.com. 2019-03-04, 19014👍, 3💬

💬 2017-04-06 Syed Mohammad: Very Nice Diffrence highlighter in brief

U2600: Miscellaneous Symbols
This section provides a quick summary of the Unicode code point block: 'Miscellaneous Symbols', which contains 160 code points to represent more miscellaneous symbols. 2019-03-02, 1065👍, 2💬

💬 2016-05-11 Neven: Thanks!

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