What Is MD5 Message Digest Algorithm?

Cryptography Tutorials - Herong's Tutorial Examples

∟MD5 Mesasge Digest Algorithm

∟What Is MD5 Message Digest Algorithm?

This section describes what is MD5 - a message digest algorithm which takes as input a message of arbitrary length and produces as output a 128-bit 'fingerprint'.

Based on the MD5 RFC document, MD5 is message-digest algorithm, which takes as input a message of arbitrary length and produces as output a 128-bit "fingerprint" or "message digest" of the input. It is conjectured that it is computationally infeasible to produce two messages having the same message digest, or to produce any message having a given pre-specified target message digest.

MD5 was designed by Ronald Rivest in 1991 to replace an earlier hash function, MD4. MD5 is more secure than MD4. However a number of weaknesses have been found in recent years. The most recent paper published in this area shows that a collision of MD5 can be found within one minute on a standard notebook PC, using a method called tunneling.

Despite its weaknesses, MD5 is widely used in digital signature processes. It's been implemented in many programming languages.

Table of Contents

About This Book

Cryptography Terminology

Cryptography Basic Concepts

Introduction to AES (Advanced Encryption Standard)

Introduction to DES Algorithm

DES Algorithm - Illustrated with Java Programs

DES Algorithm Java Implementation

DES Algorithm - Java Implementation in JDK JCE

DES Encryption Operation Modes

DES in Stream Cipher Modes

PHP Implementation of DES - mcrypt

Blowfish - 8-Byte Block Cipher

Secret Key Generation and Management

Cipher - Secret Key Encryption and Decryption

Introduction of RSA Algorithm

RSA Implementation using java.math.BigInteger Class

Introduction of DSA (Digital Signature Algorithm)

Java Default Implementation of DSA

Private key and Public Key Pair Generation

PKCS#8/X.509 Private/Public Encoding Standards

Cipher - Public Key Encryption and Decryption

►MD5 Mesasge Digest Algorithm

►What Is MD5 Message Digest Algorithm?

MD5 Message Digest Algorithm Overview

Using MD5 Message Digest in Java

Using MD5 Message Digest in PHP

Using MD5 Message Digest in Perl

SHA1 Mesasge Digest Algorithm

OpenSSL Introduction and Installation

OpenSSL Generating and Managing RSA Keys

OpenSSL Managing Certificates

OpenSSL Generating and Signing CSR

OpenSSL Validating Certificate Path

"keytool" and "keystore" from JDK

"OpenSSL" Signing CSR Generated by "keytool"

Migrating Keys from "keystore" to "OpenSSL" Key Files

Certificate X.509 Standard and DER/PEM Formats

Migrating Keys from "OpenSSL" Key Files to "keystore"

Using Certificates in IE

Using Certificates in Google Chrome

Using Certificates in Firefox

Archived Tutorials

Full Version in PDF/EPUB