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PKCS#8/X.509 Private/Public Encoding Standards
This chapter provides tutorial notes and example codes on PKCS#8 and X.509 key encoding standards. Topics include PKCS#8 standard for private key encoding; X.509 standard for public key encoding; PKCS8EncodedKeySpec and X509EncodedKeySpec classes to decode encoded keys; JcaKeyFactoryTest.java test p... 2021-11-22, ∼1712🔥, 1💬

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. 2024-01-29, ∼1695🔥, 3💬

DSA 512-bit and 1024-bit Key Pair Examples
This section provides 2 DSA key pair examples, 512-bit and 1024-bit, using DsaKeyGenerator.java. 2017-11-08, ∼1691🔥, 1💬

💬 2017-11-08 abc: ok

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, ∼1689🔥, 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

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, ∼1654🔥, 1💬

OpenSSL Introduction and Installation
This chapter provides tutorial notes and example codes on OpenSSL. Topics include introduction of OpenSSL; installing OpenSSL on Windows systems. 2017-12-24, ∼1630🔥, 4💬

💬 2016-11-28 musa: thanks

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. 2025-05-22, ∼1582🔥, 2💬

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, ∼1580🔥, 2💬

DESCipherTest.java - DES Cipher Algorithm Illustration
This section provides a tutorial Java program, DESCipherTest.java, to illustrate how DES cipher algorithm works. 2016-01-24, ∼1521🔥, 1💬

💬 2016-01-24 Joe: Output

EC Private and Public Key Pair
This section introduces what is EC (Elliptic Curve) key pair - a pair of private key and public key constructed from a given subgroup generator in a given elliptic curve group. 2022-07-11, ∼1499🔥, 2💬

💬 2022-07-10 ALIANY: IAJM PROGRAMER

💬 2020-11-07 abc: Ravana

Viewing Certificate Path
This section provides a tutorial example on how to view certificate path when visiting an 'https' Web site in IE. The top certificate in a certificate path is the CA certificate, which is trusted automatically. 2017-01-31, ∼1466🔥, 1💬

💬 2017-01-31 kishor: -----BEGIN CERTIFICATE----- MIIDqjCCApICCQC6MOh9nHUvUjANBgkqhkiG 9w0BAQUFADCBljELMAkGA1UEBhMCVVMxETAPBgNVBAgTCENvbG9yYWRvMRMwEQY. ..

Cleartext Block Size for RSA Encryption
This section discusses what is the most efficient block size when dividing a Cleartext message into blocks for RSA public encryption. The suggested block size is 'floor((x-1)/8)', where 'x' is the RSA key size, or the key modulus bit length. 2022-03-29, ∼1463🔥, 3💬

💬 2022-03-29 asdasd: I hate it enough to like it. That being said, as we discussed before probably have a look at the difficulty rating of this vs th...

💬 2021-08-18 test: Obviously, using 200-bytes as the block size is much more efficient than 1-byte block size. This means the higher block size, th...

MD5 Mesasge Digest Algorithm
This chapter provides tutorial notes and example codes on the MD5 message digest algorithm. Topics include MD5 algorithm overview; using MD5 in Java, PHP, and Perl. 2017-09-10, ∼1385🔥, 2💬

💬 2016-05-19 ishvar: hello ahemad

"openssl ecparam -list_curves" - Curves Supported by OpenSSL
This section provides a list of Elliptic Curves supported by OpenSSL. 2022-10-01, ∼1343🔥, 0💬

Introduction to AES (Advanced Encryption Standard)
Tutorial notes and example codes on AES algorithms. Topics include introduction of AES (Advanced Encryption Standard); AES encryption algorithm; AES key schedule (round keys) algorithm and illustration example; MixColumns procedure algorithm; AES decryption algorithms. 2015-11-27, ∼1326🔥, 1💬

DES Encryption Operation Modes
This chapter provides tutorial examples and notes about DES encryption operation modes. Topics include how different blocks of plaintext can be coupled together to improve the strength of the DES encryption algorithm; ECB (Electronic CodeBook), CBC (Cipher Block Chaining), CFB (Cipher FeedBack), and... 2016-11-12, ∼1284🔥, 1💬

💬 2016-11-12 kazim: very good webpage

Elliptic Curve Point Addition Example
This section provides algebraic calculation example of adding two distinct points on an elliptic curve. 2022-10-01, ∼1238🔥, 0💬

Blowfish Cipher Algorithm
This section describes the Blowfish cipher algorithm - A 16-round Feistel cipher with block size of 64 bits developed by Bruce Schneier in 1993. 2016-08-03, ∼1219🔥, 2💬

💬 2016-08-03 azi: fantastic

Steps of Using DES Algorithm in JDK JCE
This section describes how to use DES algorithm provided in the JDK JCE package. Steps include building a secret key object from key material; creating and initializing a cipher object. 2016-01-24, ∼1201🔥, 1💬

💬 2016-01-24 Joe: Very nice

Blowfish - 8-Byte Block Cipher
This chapter provides tutorial examples and notes about Blowfish block cipher. Topics include Blowfish encryption and decryption algorithm; Blowfish sub-key generation schema, Blowfish algorithm implementation in Java. 2023-10-24, ∼1159🔥, 4💬

💬 2023-10-24 test: 018a35f5-eed3-7a43-99d2-a6a22956bab7

💬 2022-06-21 sad: hello world

💬 2019-12-16 gio: i love you

What Is PEM (Privacy Enhanced Mail) Encoding?
This section describes the PEM (Privacy Enhanced Mail) Encoding - An encoding schema defined in RFC 1421-1424, 1993, specification to encode an email with encryptions into a text message of printable characters. 2022-01-19, ∼1158🔥, 2💬

💬 2022-01-16 Herong: itef.org has changed their protocol to HTTPS. I will update their links in next revision. Thanks.

💬 2022-01-15 B: Links to RFC 1421, 1422, 1423, 1424 are all 404

Visiting an "https" Web Site with Chrome
This section describes how Google Chrome shows a lock icon when you visit an 'https' Web site to provide you more security related information. 2020-07-02, ∼1112🔥, 2💬

💬 2020-07-02 Koshal Pravin jangale: Nice

"keytool" Importing CA's Own Certificate
This section provides a tutorial example on how to import CA's certificate generated by 'OpenSSL' into a 'keystore' file using 'keytool' 2016-10-20, ∼1084🔥, 2💬

💬 2016-10-20 Herong: Akhtar, AES256 encryption does not require any certificates. It requires a secret AES key, see Introduction to AES (Advanced Enc...

💬 2016-10-19 Akhtar: I have also a certificate file (.cer) .I did the same procedure to import in to mykey store and got .jks file but, now i want to...

Proof of DSA Digital Signature Algorithm
This section describes steps to prove DSA digital signature algorithm. Fermat's little theorem is the key part of the proof. 2022-10-04, ∼1067🔥, 0💬

<< < 1 2 3 4 5 6 7 8 9 … > >>   ∑:346  Sort:Date

Android ASP Astrology Big5 Bitcoin Blowfish Built-in C# Calendar CD-DVD Cheminformatics Chinese Cryptography DES Email Encoding Ethereum Flash GB2312 General H Herong History HTML Java JavaScript JDBC JSP JVM Linux Molecule Movie Music MySQL Neural Network Perl PHP Physics PKI Publication Python REST SOAP Sorting Swing TV Series UML Unicode VBScript Web Web-Services Windows WSDL XML XMLPad XSD XSL-FO