Rearrange the parts of the sentence in correct order.
Ensuring security
P-harder than hacking into a system
Q-of data, information, and
R-communication is considerably

Let's find the correct arrangement beginning with "Ensuring security":
"Ensuring security" requires a prepositional phrase to specify security of what. Segment Q provides "of data, information, and".

The series ends with "and", which needs a final noun. Segment R gives "communication" followed by the verb phrase "is considerably".

Segment P completes the comparison with "harder than hacking into a system".

Combining them: "Ensuring security of data, information, and communication is considerably harder than hacking into a system."
Sequence: QRP