For those of you who don&#x27;t do RE CTF&#x27;s, anything XOR&#x27;d _usually_ (yeah yeah there are exceptions) indicates &#x27;oh this region is interesting because someones trying to obfuscate something&#x27;. Sort of like &quot;oh hey, this has binary has been packed with __, there&#x27;s a fair chance it&#x27;s been done for for malware purpose&quot;.<p>Things are a lot more complicated these days with FLEXlm and network authentication (KMS type stuff), but previously that&#x27;d be the first place one would look to start designing keygens (rather than just patching your JE -&gt; JNE; JZ -&gt; JNZ haha).<p>Take a look at Didier&#x27;s Github. (1) It has basically the &#x27;batteries included starter kit&#x27; of the Immunity&#x2F;Olly&#x2F;IDA plugins that are useful.<p>1: <a href="https:&#x2F;&#x2F;github.com&#x2F;DidierStevens&#x2F;DidierStevensSuite" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;DidierStevens&#x2F;DidierStevensSuite</a>