Use of Google search engine in espionage:
‘Google Suggest works by listing up to 10 suggestions each time a letter is added to a search term, based on the most popular searches made by other Google users that begin with the same letters. The words offered change as each new letter is added.
Some of the options that appear as your search term takes shape can often seem quite strange: “runescape”, “rotten tomatoes” and “rock and chips” for “r”, “ro” and “roc” in “rocket”, for instance. This is the key to how Mazurczyk’s team adds its own search suggestions to the list to encode secret messages. ‘
Espionage terms explained here.