Four weeks ago, the opportunity to learn something about Reverse Engineering presented itself, I was asked to analyze and, if possible, modify a DOS executable. I saw this as a great excuse to tune my skills in assembly, so I began to search for a tool fitted for this task and as a main goal, I wanted to teach myself how to use it.<\/p>\n\n\n\n
A few searches lead me to Radare2<\/a>. At that point, I had already heard about IDA, Ollydbg, Hope and gdb but I had never used any of those tools, except gdb (during college).<\/p>\n\n\n\n Not knowing anything (practical) about Reverse Engineering, I couldn\u2019t jump right into an executable with probably hundreds of lines, so I needed some exercises to get used to this tool, and that was how I found about Crackme exercises by IOLI<\/a>. Later on, after read the Radare\u2019s manual, I discovered that the authors also recommend this series of exercises as a practice.<\/p>\n\n\n\n Through the next posts I will document my solution to the Crackme exercises and at the same time learn something NEW!<\/p>\n\n\n\n Four weeks ago, the opportunity to learn something about Reverse Engineering presented itself, I was asked to analyze and, if possible, modify a DOS executable.…<\/p>\nIt is not the objective of this post to publish the DOS executable or its disassembling.<\/em><\/strong><\/h4>\n","protected":false},"excerpt":{"rendered":"