Computer system protection

An apparatus comprising

• at least one processor;
• and
• at least one memory including computer program code;
• the at least one memory and the computer program code configured to, with the at least one processor, cause the apparatus to perform:
• receiving at least one input for execution by a computer system, wherein the at least one input is received with appropriate authorisation for execution by the computer system;
• determining if the at least one input should be passed to the computer system for execution;
• wherein determining if the at least one input should be passed to the computer system comprises encoding the at least one input into a bit representation for comparison with a reference input set;
• and
• if it is determined that the at least one input should not be passed to the computer system for execution, preventing execution of the at least one input by the computer system.

A method comprising:

• receiving at least one input for execution by a computer system, wherein the at least one input is received with appropriate authorisation for execution by the computer system;
• determining if the at least one input should be passed to the computer system for execution;
• wherein determining if the at least one input should be passed to the computer system comprises encoding the at least one input into a bit representation for comparison with a reference input set;
• and
• if it is determined that the at least one input should not be passed to the computer system for execution, preventing execution of the at least one input by the computer system.

A non-transitory computer readable medium comprising program instructions that, when executed by an apparatus, cause the apparatus to perform at least the following:

• receiving at least one input for execution by a computer system, wherein the at least one input is received with appropriate authorisation for execution by the computer system;
• determining if the at least one input should be passed to the computer system for execution;
• wherein determining if the at least one input should be passed to the computer system comprises encoding the at least one input into a bit representation for comparison with a reference input set;
• and
• if it is determined that the at least one input should not be passed to the computer system for execution, preventing execution of the at least one input by the computer system.