Side Channel Attack Based On Space Electromagnetic Radiation

Human society has entered the information age.Information is everywhere in all aspects of life.Therefore,information has become more and more important,but its security issues have become increasingly prominent,and it has become a common challenge for humanity.In recent years,side channel attacks have brought a huge threat to information security.Especially the electromagnetic side channel has leaked more encrypted information.The side channel attack based on space electromagnetic radiation is to use the electromagnetic side channel information for password cracking.The nearfield electromagnetic side channel information is mainly magnetic field,and using the electromagnetic probe for detection at close range.The far-field electromagnetic side channel information includes electric field and magnetic field,and using the antenna for detection at a long distance,and then using analysis algorithm for password cracking.This thesis will build an electromagnetic side channel attack experimental platform,using the microcontroller as a cryptographic device,using the AES cryptographic algorithm as the object of attack,using differential analysis and correlation analysis as the attack method,processing and analyzing the collected electromagnetic data,then cracking the key in the AES cryptographic algorithm at near field and far field.The main content is divided into the following sections:This paper introduces the AES encryption algorithm,analyzes each step in the algorithm,and implements this algorithm in a software encryption chip represented by a microcontroller.Then introduce the physical basis of the electromagnetic side channel attack.By simply analyzing the electromagnetic radiation mechanism of the cryptographic chip,find the electromagnetic radiation leakage model that conforms to the software encryption chip,namely the Hamming weight model and the Hamming distance model.Then introduce three common analytical methods of electromagnetic side channel attacks,Simple Electromagnetic Analysis(SEMA),Differential Electromagnetic Analysis(DEMA),and Correlation Electromagnetic Analysis(CEMA).Finally,the selected DEMA and CEMA algorithm simulations prove the effectiveness of the two methods.Design and implement an automated acquisition platform for electromagnetic side channel attacks.The coil is used to compose the circuit to collect the near-field electromagnetic information of the microcontroller,and the acquisition circuit composed of the antenna is used to collect the far-field electromagnetic information of the microcontroller,measure the noise and signal of the electromagnetic information,and verify the feasibility of the acquisition platform.Finally,based on the specific experiment of space electromagnetic radiation,the experiment uses the AES microcontroller as the cryptographic device,and uses the DEMA and CEMA analysis methods to perform the electromagnetic side channel attack.The experiment gives the specific steps of the electromagnetic side channel attack,and successfully decrypts the complete key of the AES cryptographic algorithm in both the near field and the far field.Because the far-field electromagnetic information is weak,it takes more time to crack the key.Finally,an improved electromagnetic side channel attack method is given to improve the speed of cracking the key.