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... 2025-07-18, ≈13🔥, 3💬

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Certificate X.509 Standard and DER/PEM Formats
This chapter provides tutorial notes and example codes on certificate content standard and file formats. Topics include X.509 standard for certificate content; DER encoding for certificate binary file format; PEM encoding for certificate text file format; exchanging certificates in DER and PEM forma... 2023-09-26, ∼1371🔥, 2💬

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. 2023-09-17, ∼4251🔥, 1💬

💬 2023-09-17 ecformat: this is to test EC format

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. 2023-08-10, ∼4049🔥, 3💬

💬 2023-08-10 emanuel: thanks , it was realz helpfull. can zou tell me how can i encrzpt with btc key some message, because btc use the same secp256k1 ...

tinyec - Python Library for ECC
This chapter provides tutorial notes on 'tinyec' Python library for ECC. Topics include installing 'tinyec'; creating ec.Curve objects, performing point addition and scalar multiplication. 2023-07-05, ∼1549🔥, 4💬

💬 2022-05-16 maria: hola mi mundo bonito

DES Algorithm Java Implementation
This chapter provides tutorial examples and notes about DES algorithm implementation in Java language. Topics include an example Java implementation of DES encryption and decryption algorithm; test cases of single block cleartext and ciphertext. 2023-06-23, ∼8845🔥, 18💬

💬 2023-06-23 rafa: Hello my love

💬 2018-12-13 syed zia ur rehman: i realy like your link

💬 2017-10-15 Herong: CipherDES.java also works as a decryption program. Try it by running "java DesCipher decrypt keyFile input output".

💬 2017-10-09 aa: thanks, but where i can find DES decryption

💬 2017-10-09 Denys: thx

(More comments ...)

AES MixColumns() Procedure Algorithm
A detailed description of the MixColumns() procedure algorithm is provided. The MixColumns() procedure performs a matrix multiplication of a given 'state' with a static matrix. The MixColumns() procedure is used in the AES encryption process. 2023-06-10, ∼6341🔥, 3💬

💬 2021-12-24 Muhammad Ghulam Ghouse: Appreciated

💬 2021-11-15 123: AD E0 B8 1E BF B4 41 27 5D 52 11 98 30 AE F1 E5

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. 2023-06-08, ∼9477🔥, 11💬

💬 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 ...

(More comments ...)

Key Schedule (Sub-Keys Generation) Algorithm
This section describes the Blowfish Key Schedule (Sub-Keys Generation) algorithm. It uses the binary representation of the fractional portion of constant Pi - 3.1415927... as initial values. 2023-06-05, ∼1852🔥, 3💬

💬 2023-06-05 Daniel: I don't understand how to assign key for plaintext

💬 2016-03-17 Herong: Hi Yogita, Blowfish(T) function refers the Blowfish algorithm described in the previous tutorial: Blowfish Cipher Algorithm .

💬 2016-03-16 YOGITA: what is the function blowfish(T) here? Send the pseudo code

"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, ≈15🔥, 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, ∼8662🔥, 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?

(More comments ...)

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, ∼1580🔥, 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

mcrypt Encryption Functions
This section describes mcrypt encryption functions and 4 DES ciphers (operation modes) - 8-byte ECB, 8-byte CBC, 1-byte CFB, and 1-byte OFB ciphers. 2023-02-28, ∼261🔥, 1💬

💬 2023-02-28 adry: password

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, ≈20🔥, 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, ∼930🔥, 2💬

💬 2023-02-19 test: hello i m

EC Private Key Example - secp256k1
This section describes the elliptic curve, E(0,7), also named as secp256k1, and the subgroup parameters, which are used in Bitcoin, Ethereum, and many other cryptocurrency apps. 2023-01-24, ∼2499🔥, 3💬

💬 2023-01-24 3azzi: 9awed

DsaKeyGenerator.java - Generating DSA Key Pair
This section provides a tutorial example on how to using the Java default implementation of DSA (Digital Signature Algorithm) to generate DSA key pair, public key and private key. 2023-01-10, ∼689🔥, 1💬

💬 2023-01-10 Dontien: The tutorial was helpfull

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, ∼537🔥, 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, ∼3899🔥, 7💬

💬 2022-12-07 sudarshan: hello

💬 2018-12-22 Hari: Hello

💬 2016-01-02 sivaprakash: nice

RsaKeyEncryption.java for RSA Encryption Operation
This section provides a tutorial example on how to implement RSA encryption operation using the java.math.BigInteger class. The important part of the implementation is to determine the cleartext block size, ciphertext block size, and the padding of the last block. 2022-12-15, ∼276🔥, 1💬

Importing Certificate Path into Firefox
This section provides a tutorial example of trying to import a certificate path into Firefox. But it failed.. 2022-11-16, ∼163🔥, 0💬

Generating CSR (Certificate Signing Request)
This section provides a tutorial example on how to use the 'keytool -certreq' command to generate a CSR (Certificate Signing Request) for the public key stored in a key entry. 2022-11-03, ∼165🔥, 0💬

Archived: Managing Certificates in IE 9
This section provides a tutorial example on how to use IE 9 to manage certificates installed in certificate stores. 2022-10-29, ∼155🔥, 0💬

Archived: Managing Certificates in Firefox 18
This section provides a tutorial example on how to access and manage certificates pre-installed Firefox 18. 2022-10-29, ∼182🔥, 0💬

Private and Public Keys and Related Interfaces
This section describes private and public key pairs used in RSA and DSA encryption algorithms. JDK supports private and public keys with the java.security.Key interface. 2022-10-22, ∼158🔥, 0💬

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