Build a backdoor?
My understanding of encryption is generating 2 bloody big numbers, 1 of which can be made public and the other you keep private
And the method runs like this
Type message
Encrypt using public key
Transmit
Decrypt using private key
Read message
Once its encrypted it cannot be read without the private key so its putting a weakness into the encryption program , say listening on port 45678 for a packet to arrive and tell the program to send a copy of the message to 123.567.890.123.
And how long would that last against reverse engineering? OK they could do something cleverer, but thats what it boils down to, the instant the backdoor is found it will be all over the internet.
The best way to fight this would be to point out to MPs and such that THEIR messages will be read if the backdoor ever leaks out......