McEliece post quantum cryptography Can someone explain me in basic simplistic english if possible how does McEliece asymmetric encryption works and why its quantum safe ? Thanks in advance.
How does the McEliece asymmetric encryption work?


The intuition is really quite simple here. Assume you have a message of $k$ bits. You then use a specific mathematical operation to create a larger intermediate value of $n$ bits with $n&gt;k$ such that it is not immediately obvious what the original message was and such that you can recover up to $t$ bit-errors using a specific algorithm. You then actually introduce $t$ random bit errors into your message to get your ciphertext.

Decryption is essentially reversing the above knowing the special values used to "obfuscate" the original message and the algorithm to remove the errors.

The idea behind the security of this scheme is that you cannot be sure for every bit that you are seeing whether it has been changed or not and through the "obfuscation" a wrong guess will yield essentially unrelated values when trying to invert the "obfuscation".


  why its quantum safe?


The entire reason is that we don't know how to (efficiently) break it if we had a quantum computer even though we have thought about this for more than 20 years.