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Software Re-engineering

Reverse engineering is the process of discovering the technological principles of a human made device, object or system through analysis of its structure, function and operation. It often involves taking something (e.g., a mechanical device, electronic component, or software program) apart and analyzing its workings in detail to be used in maintenance, or to try to make a new device or program that does the same thing without using or simply duplicating (without understanding) any part of the original.

Reverse engineering has its origins in the analysis of hardware for commercial or military advantage. The purpose is to deduce design decisions from end products with little or no additional knowledge about the procedures involved in the original production. The same techniques are subsequently being researched for application to legacy software systems, not for industrial or defence ends, but rather to replace incorrect, incomplete, or otherwise unavailable documentation.

Reasons for reverse engineering:

Interoperability.

Product analysis. To examine how a product works, what components it consists of, estimate costs, and     identify potential patent infringement.

Digital update/correction. To update the digital version of an object to match an "as-built" condition.

Security auditing.

Acquiring sensitive data by disassembling and analysing the design of a system component.

Military or commercial espionage. Learning about an enemy's or competitor's latest research by stealing     or capturing a prototype and dismantling it.

Removal of copy protection, circumvention of access restrictions.

Creation of unlicensed/unapproved duplicates.

Materials harvesting, sorting, or scrapping.

Academic/learning purposes.

Curiosity.

Competitive technical intelligence.

Learning: learn from others' mistakes. Do not make the same mistakes that others have already made     and subsequently corrected.