> a specific length for a specific request that is known to be a certain Wikipedia page (for example: https://en.wikipedia.org/wiki/Islamic_State_of_Iraq_and_th

> a specific length for a specific request that is known to be a certain Wikipedia page (for example: https://en.wikipedia.org/wiki/Islamic_State_of_Iraq_and_the_ https://en.wikipedia.org/wiki/Islamic_State_of_Iraq_and_the_...) means certain encrypted requests are known to an adversary. While you are right in principle (generally: all encryption schemes explicitly exclude message length from their confidentiality claims), in practice, some parts are user-specific (such as the username if you are logged in, and which compression algorithm is selected). That said, the ideal encryption tunnel is one which is always running, transmitting a random stream that is likely encrypting a sequence of zeroes most of the time. The energy consumption may be problematic however.