The Java bytecode can be easily understood. Everyone knows. This afternoon I got a long-awaited JBuilder OpenTools (yesterday 1.0 released, freshly baked! But only 14 days, how to do this, so I didn't hesitate to put down Other work, studied the crack and anti-crack of the software encryption method, combined with some of the previous experience, a composition with everyone, is not encouraging everyone ... Crack: Provide some License. The software of Key (Encrypted file containing authorization information), usually this file uses DES, RAS, and CRC checks and is generally binary (even if it is sometimes output into base64 encoding), the direct modification file is wasting time, you can first Reflexible By reading the source program to explore the decryption process, if the process is reversible, then you can realize a cryptory process, you can easily generate the license key you want yourself; if the process is irreversible, it is not unable, some intensity A small encryption algorithm can still be used in violent cracking, and there is a situation to encrypt digital encryption (generally referring to the expiration time) If you can modify this expiration time, you can use it for a while, describe the mathematical method: Suppose Collection X is a set of elements contained in plain text, y is the mapping after the X after an algorithm, contains ciphertext elements, if there is
