Kanal how does signature analysis work?

[5Alive]

Hi guys,
I'm a new member of this great forum. I'm also new to the art of reversing and hoping to reverse a Delphi app.

I scanned the exe with Kanal v2.2 tool and it reports that it contains RC5/RC6 crypto signatures.

Is the signature a recognisable block of bytes which are the opcodes used in the algorithm? Or is a signature defined in some other way?

Be as technical as you want any reply.

Thanks for your help