too much time is being spent thinking about the technical aspects of enforcement and use of 'backdoors'. what everyone's failing to realize is that the technical aspects of crypto laws are irrelevent. it's how they will be used htat's important. if any cyrpto laws are passed, they'll be used in prosecution and trial rather than proactively enforced.picture this scenario: you are a criminal who has been sending encrypted mesages to someone else. you're busted, and on trial you are asked to decrypt the messages. you refuse. you are then thrown in jail for not complying with the crypto laws.
again, i'm not a lawyer, but it seems that if crypto laws will work in this manner, we are throwing away our 5th ammendment right to refuse to incriminate ourself.