Introduction Burp Suite Part VIII (Comparer Tab)

Burp Comparer is a simple tool for performing a comparison (a visual "diff") between any two items of data. 

Some common uses for Burp Comparer are as follows: 

• When looking for username enumeration conditions, you can compare responses to failed logins using valid and invalid usernames, looking for subtle differences in the responses.
• When an Intruder attack has resulted in some very large responses with different lengths than the base response, you can compare these to quickly see where the differences lie.
• When comparing the site maps or Proxy history entries generated by different types of users, you can compare pairs of similar requests to see where the differences lie that give rise to different application behavior.
• When testing for blind SQL injection bugs using Boolean condition injection and other similar tests, you can compare two responses to see whether injecting different conditions has resulted in a relevant difference in responses.

Word compare - This comparison tokenizes each item of data based on whitespace delimiters, and identifies the token-level edits required to transform the first item into the second. It is most useful when the interesting differences between the compared items exist at the word level, for example in HTML documents containing different content.

Byte compare - This comparison identifies the byte-level edits required to transform the first item into the second. It is most useful when the interesting differences between the compared items exist at the byte level, for example in HTTP requests containing subtly different values in a particular parameter or cookie value.

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Source : Burp Suite Official Site

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