18. The method of claim 10 , further comprising storing the set of encryption rules at the non-volatile repository, the non-volatile repository accessible by a plurality of networked computing systems.
10. A method of automatically generating encryption rules, the method comprising: by a rules generation system comprising one or more hardware processors, determining a set of file portions from a plurality of training files, at least some of the set of file portions comprising content designated as sensitive information, each of the file portions comprising a subset of content of at least one file from the plurality of training files; generating a prospective encryption rule for addition to a set of available encryption rules based at least in part on an aggregated set of the file portions, the aggregated set of the file portions including at least one file portion that appears in more than one file from the plurality of training files; determining that a number of files from the plurality of training files identified for encryption by performance of the prospective encryption rule does not satisfy a threshold number of files; and in response to said determining, iteratively modifying the prospective encryption rule until the threshold number of files of the plurality of training files are identified for encryption by performance of the modified prospective encryption rule, and storing the modified prospective encryption rule at a non-volatile repository.