▁goods ▁and ▁services ▁with ▁little ▁inter ference ▁from ▁the ▁law . ▁These ▁are ▁examples ▁of ▁central ized , ▁and ▁thus ▁vulner able , ▁market p laces , ▁or ▁tools . ▁Similarly , ▁web ▁wal lets ▁employed ▁by ▁Bit co in ▁users ▁are ▁also ▁central ized ▁and ▁vulner able . ▁Dec ent ral ized ▁and ▁distributed ▁market p laces ▁and ▁currency ▁ex changes ▁are ▁more ▁difficult ▁to ▁target ▁by ▁law ▁enfor cement ▁ag encies ▁and ▁may ▁provide ▁more ▁security ▁to ▁its ▁end - users . ▁A ▁decent ral ized ▁and ▁distributed ▁market place ▁in ▁development ▁is ▁Open B az aar . ▁ ▁The ▁technical ▁challenge ▁in ▁developing ▁and ▁maintain ing ▁these ▁crypt ographic ▁systems ▁is ▁trem end ous , ▁which ▁causes ▁some ▁program mers ▁to ▁be ▁interested ▁in ▁joining ▁such ▁projects . ▁ ▁C rypt ography ▁and ▁law ▁ ▁C rypto - an arch ists ▁argue ▁that ▁without ▁encryption ▁ab ilities , ▁messages , ▁personal ▁information , ▁and ▁private ▁life ▁would ▁be ▁seriously ▁dam aged . ▁ ▁They ▁argue ▁that ▁a ▁ban ▁on ▁crypt ography ▁is ▁equal ▁to ▁the ▁er adic ation ▁of ▁secre cy ▁of ▁correspond ence . ▁They ▁argue ▁that ▁only ▁a ▁dra con ian ▁police - state ▁would ▁criminal ize ▁crypt ography . ▁ ▁It ▁is ▁already ▁illegal ▁to ▁use ▁it ▁in ▁some ▁countries , ▁and ▁export ▁laws ▁are ▁restrict ive ▁in ▁others . ▁Cit iz ens ▁in ▁the ▁United ▁Kingdom ▁must , ▁upon ▁request , ▁give ▁keys ▁for ▁dec ryption ▁of ▁personal ▁systems ▁to ▁authorities . ▁Fail ing ▁to ▁do