The KEYP is a keyprint (hash) of the security certificate the hub will send when a client connects to a secure port. It's like the TTH of a file.
KEYP protects against MITM-attacks (man-in-the-middle), where a connection can be hijacked somewhere between client and hub. Because with KEYP the client already knows what the keyprint of the expected certificate has to be, it can't be replaced with another one by the man in the middle.
If the keyprint of the received certificate doesn't match the KEYP, the connection is dropped.
And although everyone knows the KEYP, you won't be able to generate a security certificate from it.
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