Herong's Tutorial Examples: Cryptography

XML Tutorials - Herong's Tutorial Examples
This XML tutorial book is a collection of notes and sample codes written by the author while he was learning XML himself. Topics include introduction to XML, DTD (Document Type Definition), XSD (XML Schema Definition), XPath (XML Path Language), XSL (Extensible Stylesheet Language), XSLT (XSL Transf... 2023-03-09, 11651👍, 3💬

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"OpenSSL" Generating Certificates in DER and PEM
This section provides a tutorial example on how to generate certificates in DER and PEM formats using 'OpenSSL'. 2023-05-24, 12523👍, 4💬

Illustration of DSA Algorithm: p,q=7,3
This section provides a tutorial example to illustrate how DSA digital signature algorithm works with small prime modulus p=7 and prime divisor q=3. 2023-05-03, 8152👍, 7💬

💬 2023-05-03 Zavala: Greetings from the Tower

💬 2023-03-27 Davide: Greetings from Italy

💬 2016-03-22 Herong: Peter, I see the issue now. This example needs to be reviewed and updated. Thanks for the feedback.

💬 2016-03-21 peter winzell: x is not selected according to 0 < x < q

💬 2015-10-19 Herong: Hi Marian, do you have a question about this tutorial?

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What Is PKCS5Padding?
This section describes what is PKCS5Padding - a schema to pad cleartext to be multiples of 8-byte blocks. 2023-04-12, 45855👍, 33💬

💬 2023-04-12 {"partnerReferenceNo": "APP12345: ok

💬 2023-01-18 Servant of Elon Musk's Regent: You are the chosen one!

💬 2022-11-17 Elon Musk's Regent: mommy

💬 2022-11-14 Elon Musk: Giving away twitter to the first person to reply and call me mommy

💬 2022-10-23 merlyn: hola

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EC (Elliptic Curve) Key Pair
This chapter provides tutorial notes on EC (Elliptic Curve) key pair. Topics include definition of EC private and public key pair; example of elliptic curve and subgroup used to generate good EC key pair; using OpenSSL command line tool to generate EC key pairs. 2023-03-23, 714👍, 1💬

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. 2023-03-21, 4447👍, 9💬

💬 2023-02-23 CYR: Thanks for providing the detail example, it helps me to understand the algorithm a lot. The value for g looks like incorrect to ...

💬 2021-01-09 Flying Horse: Hello Dr Yang, My verification scheme is as follows lhs = (r**s mod p)mod q rhs = ((g**h mod p)*(y**r mod p)) mod q If lhs = rhs...

💬 2021-01-08 Herong: Flying, give us an example to show that this verification scheme is not working?

💬 2021-01-07 Flying Horse: Hello Dr Yang, this is a very helpful tutorial. I am trying a different verification scheme for DSA signature. Unfortunately, it...

💬 2020-06-22 Filip: Very helpful, thanks!

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Certificate in PEM Format
This section describes what is certificate PEM (Privacy Enhanced Mail) format - A format uses PEM idea to convert a certificate in DER format to a message of printable characters. The conversion uses the Base64 encoding. 2023-03-08, 14009👍, 7💬

💬 2021-12-27 Azul: Why do you want me to write things like that?

💬 2020-02-23 Herong: Mark, if your certificate is signed by your own CA, put it on the Apache server together with the CA certificate to test. Other ...

💬 2020-02-17 mark scorfield: Hi i have a pem certificate x509 that i would like to share against my own certificate signing authority , what is the best way ...

💬 2016-03-30 Herong: Bcbin, why don't you post your question here? Maybe others can help you too. Or send me an email directly.

💬 2016-03-27 bcbin: my name is bcbin, my email is bcbin@yahoo.com. please connecting me. i need you help ):

64-bit RSA Key Validated by RsaKeyValidator.java
This section provides a tutorial example on how a 64-bit RSA key is validated by RsaKeyValidator.java with 3 rounds of encryption and decryption tests. 2023-03-05, 1344👍, 3💬

💬 2018-06-09 Herong: Adrian, you are welcome!

💬 2018-06-09 Adrian: I needed in rush working 64-bit keys. You helped me a lot. Thanks! :D

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. 2023-02-22, 18450👍, 6💬

💬 2023-02-22 aaa: 124, 52, -95, -30, 47, 95, -105, -1, -114, -38, -100, -84, 40, -3, 36, -13

💬 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

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. 2023-02-19, 538👍, 2💬

💬 2023-02-19 test: hello i m

What Is DER (Distinguished Encoding Rules) Encoding?
This section describes the DER (Distinguished Encoding Rules) - A binary format of encoding a data value of any data types including nested data structures. 2023-02-13, 25386👍, 11💬

💬 2023-02-13 Amar: Amar

💬 2022-12-02 Victor: meaningful comments.

💬 2018-10-29 Thanks!: meaningful comments.

💬 2017-03-15 noname: thanks

💬 2016-01-25 Dev: hello

Build New Curves with tinyec
This section provides a tutorial example on how to create elliptic curve, actually a reduced elliptic curve group, with tinyec Python library. 2022-12-27, 235👍, 1💬

PHP Implementation of DES - mcrypt
This chapter provides tutorial examples and notes about PHP implementation of DES. Topics include introduction of mcrypt library; mcrypt encryption functions; DES encryption and decryption test program and test result. 2022-12-26, 3371👍, 7💬

💬 2022-12-07 sudarshan: hello

💬 2018-12-22 Hari: Hello

💬 2016-01-02 sivaprakash: nice

Illustration of RSA Algorithm: p,q=5,7
This section provides a tutorial example to illustrate how RSA public key encryption algorithm works with 2 small prime numbers 5 and 7. 2022-12-11, 7796👍, 10💬

💬 2022-12-11 Racheal mweemba: This was helpful

💬 2022-12-11 Racheal Mweemba: ❤️❤️❤️❤️

💬 2022-04-23 Shivam: Please provide the code for the same

💬 2021-12-23 x: 5

💬 2020-11-22 Herong: fab, as shown in the tutorial, the modulus is 35. The encryption key (public key) is 5, and the decryption key (private key) is ...

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EC Key in PEM File Format
This section provides a tutorial example on the EC key PEM file format. EC domain parameters are stored together with the private key. 2022-10-01, 2019👍, 0💬

Generate secp256k1 Keys with OpenSSL
This section provides a tutorial example on how to generate EC (Elliptic Curve) private and public key pairs using secp256k1 domain parameters. 2022-10-01, 1828👍, 0💬

"secp256r1" - For 256-Bit ECC Keys
This section describes 'secp256r1' elliptic curve domain parameters for generating 256-Bit ECC Keys as specified by secg.org. 2022-10-01, 1465👍, 0💬

"brainpoolP256r1"“ - For 256-Bit ECC Keys
This section describes 'brainpoolP256r1' elliptic curve domain parameters for generating 256-Bit ECC Keys as specified by RFC 5639. 2022-10-01, 1084👍, 0💬

"keytool -keyalg EC" - Generate EC Key Pair
This section provides a tutorial example on how to use 'keytool' provided in JDK (Java Development Kit) package to generate EC private-public key pairs using the the 'keytool -genkeypair -keyalg EC' command. 2022-10-01, 773👍, 0💬

Elliptic Curve Point Addition Example
This section provides algebraic calculation example of adding two distinct points on an elliptic curve. 2022-10-01, 646👍, 0💬

Elliptic Curve Point Doubling Example
This section provides algebraic calculation example of point doubling, adding a point to itself, on an elliptic curve. 2022-10-01, 483👍, 0💬

Download and Install tinyec
This section describes how to install tinyec, which can be done by running the 'pip install tinyec' command. 2022-10-01, 426👍, 0💬

"openssl ecparam -list_curves" - Curves Supported by OpenSSL
This section provides a list of Elliptic Curves supported by OpenSSL. 2022-10-01, 403👍, 0💬

"secp256k1" - For 256-Bit ECC Keys
This section describes 'secp256k1' elliptic curve domain parameters for generating 256-Bit ECC Keys as specified by secg.org. 2022-10-01, 370👍, 0💬

Identity Element on an Elliptic Curve
This section describes the 'identity element', which is the 'infinity point' in our addition and subtraction operations on an elliptic curve. 2022-10-01, 356👍, 0💬

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