Argon2 was the winner of the Password Hashing Competition in July 2015, a one-way hashing function that is intentionally resource (CPU, memory, etc) intensive. In Argon2, we can configure the length of the salt, the length of the generated hash, iterations, memory cost, and CPU cost to control the resources that are needed to hash […]
The Advanced Encryption Standard (AES, Rijndael) is a block cipher encryption and decryption algorithm, the most used encryption algorithm in the worldwide. The AES processes block of 128 bits using a secret key of 128, 192, or 256 bits. This article shows you a few of Java AES encryption and decryption examples: AES String encryption […]
In Java, we can use SecureRandom.nextBytes(byte[] bytes) to generate a user-specified number of random bytes. This SecureRandom is a cryptographically secure random number generator (RNG). 1. Random 12 bytes (96 bits) 1.1 Generates a random 12 bytes (96 bits) nonce. HelloCryptoApp.java package com.mkyong.crypto; import java.security.SecureRandom; public class HelloCryptoApp { public static void main(String[] args) { […]
This article shows you how to encrypt and decrypt a message with the ChaCha20-Poly1305 algorithm, defined in RFC 7539. P.S The ChaCha20-Poly1305 encryption algorithm is available at Java 11. 1. FAQs Some commonly asked questions: 1.1 What is ChaCha20-Poly1305? ChaCha20-Poly1305 means the ChaCha20 (encryption and decryption algorithm) running in AEAD mode with the Poly1305 authenticator. […]
In this article, we will show you how to encrypt and decrypt a message with the ChaCha20 stream cipher, defined in RFC 7539. P.S ChaCha20 stream cipher is available at Java 11, refer to JEP 329. Note You may interest at this ChaCha20-Poly1305 encryption examples 1. How it works? 1.1 The inputs to ChaCha20 encryption […]
The MD5, defined in RFC 1321, is a hash algorithm to turn inputs into a fixed 128-bit (16 bytes) length of the hash value. Note MD5 is not collision-resistant – Two different inputs may producing the same hash value. Read this MD5 vulnerabilities. In Python, we can use hashlib.md5() to generate a MD5 hash value […]
In Asymmetric Cryptography example we discussed the use of Public Key Pair in Cryptography. Another important use of the Public Key Infrastructure is in Digital Signatures. Digital Signatures are the digital equivalent of handwritten signatures with one important difference; they are not unique but come as a product of the message. A valid digital signature […]
Hybrid Cryptography is the silver lining between safe, but slow cryptography over big data (Asymmetric Cryptography) and unsafe but fast cryptography (Symmetric Cryptography). Hybrid Cryptography combines the speed of One-Key encryption and decryption along with the security that the Public-Private Key pair provides and thus considered a highly secure type of encryption. The most common […]
Asymmetric Cryptography, also known as Public Key Cryptography, is an encryption system in which two different but uniquely related cryptographic keys are used. The data encrypted using one key can be decrypted with the other. These keys are known as Public and Private Key Pair, and as the name implies the private key must remain […]
Symmetric-Key Cryptography is an encryption system in which the same key is used for the encoding and decoding of the data. The safe distribution of the key is one of the drawbacks of this method, but what it lacks in security it gains in time complexity. One should always assume that the encryption algorithms are […]
In Java, we can use MessageDigest to get a SHA-256 or SHA3-256 hashing algorithm to hash a string. MessageDigest md = MessageDigest.getInstance("SHA3-256"); byte[] result = md.digest(input); This article shows how to use Java SHA-256 and SHA3-256 algorithms to generate a hash value from a given string and checksum from a file. Note The hashing is […]
The MD5, defined in RFC 1321, is a hash algorithm to turn inputs into a fixed 128-bit (16 bytes) length of the hash value. Note MD5 is not collision-resistant – Two different inputs may producing the same hash value. Read this MD5 vulnerabilities. There are many fast and secure hashing algorithms like SHA3-256 or BLAKE2; […]
