IT Professionals Association president Robert Hudson said though the government was saying it did not want a backdoor into encrypted communication applications, such a method was the only way that it could achieve what it had stated it wanted to do.
But Hudson said just making such statements could be interpreted as "political opportunism" because anyone who had an understanding of how encryption worked would know that such proposals could not be implemented.
"With modern encryption processes, this is only possible if you have access to the key required to decrypt the message, as 'cracking' the encryption is largely not possible otherwise due to the mathematical complexity of the algorithms used."
Hudson said this meant that despite the government's protests that it did not want backdoors, "that's the only way to achieve what they want – and if they have backdoors into the encryption, then two things will happen:
"The backdoor will be leaked/exposed. This basically means that the encryption process can no longer be trusted.
"People will stop using encryption processes they cannot trust."
He said this would have little effect on the "bad guys" because those who were competent would switch to communications protocols they trusted or else manage the encryption keys themselves.
"By some reports, less than half of all communications between 'bad guys' is estimated to be encrypted today and these are likely already the competent ones. Such a knee-jerk reaction will, however, have a horrific impact on innocent use of encryption. Legitimate users will be forced to find other methods of encryption," Hudson said.
"If SSL certificate vendors are forced to bake 'backdoors' into their certificates, the impact on eCommerce alone (currently a $32 billion business in Australia in 2017) will be immense.
"This government appears to have not learnt anything from past technology initiatives that were implemented on the run. In typical fashion, there appears to have been no serious consultation with experts and disregard for (or no understanding of) the complexities involved."