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The Fault Sensitivity Analysis (FSA) attack is one of the fault-based attacks that can retrieve secret keys of a cryptography system by injecting different kinds of fault into the system, observing and analyzing the outcoming side-channel information. In this thesis, we study and compare the different type of physical attacks to find out the advantages and disadvantages of each attack method. Then we dig more into the FSA attack, looking into the principle, application and implementation of the attack method. Finally, we perform an FSA attack by injecting clock glitches during operation and apply this attack to the Sbox of Advanced Encryption Standard (AES). We complete the automation of profiling phase and successfully retrieve the key from the Sbox.