October 2018
Beginner to intermediate
436 pages
9h 36m
English
Content preview from Mastering Reverse Engineering
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Signed numbers
Binary numbers can be structured as signed or unsigned. For signed numbers or integers, the most significant bit dictates what sign the number is in. This requires a defined size of the binary such as BYTE, WORD, DWORD, and QWORD. A BYTE has a size of 8 bits. A WORD has 16 bits while a DWORD (double WORD) has 32 bits. A QWORD (quad WORD) has 64 bits. Basically, the size doubles as it progresses.
In our example, let's use a BYTE. Identifying a positive binary number is easy. In positive numbers, the most significant bit, or 8th bit in a byte, is 0. The rest of the bits from 0 to the 7th bit is the actual value. For a negative binary number, the most significant bit is set to 1. However, the value set from 0 to the 7th bit is ...
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