Instead of sending 17 packets for placing objects (open or closed doors and chest) - which amounts to approx 17*12 bytes of data being sent over the network - we use bit manipulation of a single Integer value to decide if one is open or closed. The barrows minigame chest can be open or closed, along with approx ~16 doors on the bottom level which are open or shut. Varbit uses bit manipulation to decrease networking traffic that would be caused by using an alternative packet with a larger amount of data which is not required in certain circumstances. Used in tandem with RSA (see above) this encrypts the packet ids to stop people sniffing data sent between the client and server, such as passwords. See Nikki's thread on rune-server: here ISAAC gives isaac a purpose again, since it is part of the protocol.
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This trend stayed with development to this day and few servers have this protection enabled, due to not knowing how to use the systems. In the early days of RSPS development (~2006) RSA and ISAAC protection were disabled which means you didn't need to know how to works to get an RSPS running. RSA is an encryption algorithm put in place by Jagex to stop packet sniffers like autorune, which can fake packets, by hiding their isaac keys in the encrypted buffer, it made it impossible to decrypt the raw ISAAC cipher data. rename to make it readable and document it.
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