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Output:4. Click to download: in duplicate (positive and negative printing), the unit certificate shall be stamped with the official seal and the legal person certificate shall be signed.Before performing an SSL data transfer, Both sides of the communication must first shake hands with SSL, The encryption algorithm has been negotiated to exchange the encryption key, Perform identity authentication, Normally, This SSl handshake process only needs to be performed once, But there is a Regegotiation option in the SSL protocol, It allows renegotiation of the secret key to create a new key, The attacker repeatedly carries out the key renegotiation process, and the key renegotiation process requires the server to invest 15 times more CPU computing resources than the client. In addition, even if the server does not support Renegotiation, the attacker can still create similar attack effects by opening a new SSL connection separately.2. Exception maintenance照这情形，想在战场上保住性命，怕是难。…了一巴掌，于是他冲出家门。