Patent ID: 9444797
Filing Date: 2016-09-13
CPC Classification: G06F,H04L,H04W

Claim Text:
1. A method performed under control of a server, comprising: calculating co-occurrence probabilities of a plurality of combinations, each of which includes at least two elements that are included in original message data; extracting, from the original message data, a first data set that includes at least one combination that has a first co-occurrence probability from among the plurality of combinations and a second data set that includes at least one combination that has a second co-occurrence probability from among the plurality of combinations; generating first dummy data by using the first data set and second dummy data by using the second data set, the first dummy data reduces the first co-occurrence probability of the first data set and the second dummy data increases the second co-occurrence probability of the second data set; adding the generated first dummy data and second dummy data to the original message data to generate obfuscated message data; rendering the obfuscated message data to a web browser that is installed on an end device; and transmitting, to the end device, a program file that makes the first dummy data and second dummy data invisible from the obfuscated message rendered on the web browser, wherein the first co-occurrence probability is ranked in from top 10 percent to top 20 percent of the co-occurrence probabilities, and wherein the second co-occurrence probability is ranked in from top 40 percent to top 60 percent of the co-occurrence probabilities.