Computer Science ›› 2020, Vol. 47 ›› Issue (7): 263-267.doi: 10.11896/jsjkx.200200034

• Information Security • Previous Articles     Next Articles

Revised Impossible Differential Cryptanalysis of PFP Block Cipher

SHEN Xuan, WANG Xin-mei, HE Jun, SUN Zhi-yuan   

  1. College of Information and Communication,National University of Defense Technology,Wuhan 430010,China
  • Received:2020-02-05 Online:2020-07-15 Published:2020-07-16
  • About author:SHEN Xuan,born in 1990,Ph.D,lectu-rer.His main research interests include design and cryptanalysis of symmetric ciphers.
    HE Jun,born in 1979,Ph.D,professor.His main research interests include cryptography and network security.
  • Supported by:
    This work was supported by the National Natural Science Foundation of China(61902414)

Abstract: Nowadays,the application scenarios in the resource-constrained terminal system appear more and more,and the data encryption requirement of them also needs to be satisfied.There are many lightweight block ciphers designed such as PRESENT which is an international standard block cipher.PFP cipher is an ultra-lightweight block cipher which takes Feistel structure,and its round function is designed by using the experience of PRESENT cipher for reference.The block size of PFP is 64-bit,the key size of PFP is 80-bit and its round number is 34.For PFP,this paper studies its ability against impossible differential cryptanalysis.In the design document,the designers proposed a 5-round impossible differential and attacked reduced 6-round PFP cipher with this distinguisher.Moreover,the designers can recover 32-bit master key.Comparing with this result,by exploiting the differential property of the S-box in PFP,this paper constructs a 7-round impossible differential distinguisher and attack reduced 9-round PFP.Moreover,it can recover 36-bit master key.Therefore,the result is much better than the known one in terms of either the round number or the recovered key.So far as I know,the result in this paper is the best impossible differential cryptanalysis of PFP cipher.

Key words: Block cipher, PRESENT algorithm, PFP algorithm, Impossible differential cryptanalysis, Non-linear component

CLC Number: 

  • TP309
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