Microsoft Github suspected man-in-the-middle attack, domestic access reports wrong certificate

GitHub has recently been suspected of being attacked by a man-in-the-middle attack, specifically in the field of cryptography and computer security, which means that the attacker and the communication are separated to create independent connections and exchange the data they receive to make the communication Instead, they believe that they are talking directly to each other through a private connection, but in fact the entire conversation is completely controlled by the attacker. In short, it is through intercepting normal network communication data, and performing data tampering and sniffing, but the two sides of the communication are unaware of it.