▁this ▁can ▁result ▁in ▁imprison ment ▁for ▁up ▁to ▁two ▁years , ▁without ▁evidence ▁of ▁other ▁criminal ▁activity . ▁ ▁This ▁legisl ative ▁key - s urr ender ▁t actic ▁can ▁be ▁circum vent ed ▁using ▁automatic ▁re key ing ▁of ▁secure ▁channels ▁through ▁rapid ▁generation ▁of ▁new , ▁un related ▁public ▁and ▁private ▁keys ▁at ▁short ▁intervals . ▁Following ▁re key ing , ▁the ▁old ▁keys ▁can ▁be ▁deleted , ▁rendering ▁previously ▁used ▁keys ▁in access ible ▁to ▁the ▁end - user , ▁and ▁thus ▁removing ▁the ▁user ' s ▁ability ▁to ▁disc lose ▁the ▁old ▁key , ▁even ▁if ▁they ▁are ▁willing ▁to ▁do ▁so . ▁Techn ologies ▁en abling ▁this ▁sort ▁of ▁rapidly ▁re key ed ▁encryption ▁include ▁public - key ▁crypt ography , ▁hardware ▁PR NG s , ▁perfect ▁forward ▁secre cy , ▁and ▁opportun istic ▁encryption . ▁ ▁Many ▁apps ▁commonly ▁in ▁use ▁today ▁on ▁mobile ▁devices ▁around ▁the ▁world ▁employ ▁such ▁encryption . ▁The ▁only ▁ways ▁to ▁stop ▁this ▁sort ▁of ▁crypt ography ▁is ▁to ▁ban ▁it ▁completely ▁( any ▁such ▁ban ▁would ▁be ▁un en force able ▁for ▁any ▁government ▁that ▁is ▁not ▁total itar ian , ▁as ▁it ▁would ▁result ▁in ▁massive ▁invas ions ▁of ▁priv acy , ▁such ▁as ▁blank et ▁permission ▁for ▁physical ▁searches ▁of ▁all ▁computers ▁at ▁random ▁intervals ), ▁or ▁otherwise ▁raise ▁bar riers ▁to ▁its ▁practical ▁use ▁( be ▁they ▁techn ological ▁or ▁legal ). ▁Such ▁bar riers ▁represent ▁a ▁difficulty ▁and ▁risk ▁to ▁the ▁users ▁of ▁such ▁crypt ographic