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                            ## 4.?**Hashing/HMAC 算法**

應該選擇[SHA2](http://en.wikipedia.org/wiki/SHA-2)類的算法:: SHA-256, SHA-384, SHA-512, SHA-512/256

優先使用 SHA-512/256，SHA-512/256這個算法把 SHA-512 的512bit輸出截短到256bit，避開了length extension 攻擊。 同時，目前SHA-2是很安全可靠的，你不需要升級到SHA-3.

此外，應該

*   避免SHA-1
*   避免MD5
*   避免MD6
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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