Paper 2020/1072

Cryptanalysis of the permutation based algorithm SpoC

Liliya Kraleva, Raluca Posteuca, and Vincent Rijmen


In this paper we present an analysis of the SpoC cipher, a second round candidate of the NIST Lightweight Crypto Standardization process. First we present a differential analysis on the sLiSCP-light permutation, a core element of SpoC. Then we propose a series of attacks on both versions of SpoC, namely round-reduced differential tag forgery and message recovery attacks, as well as a time-memory trade-off key-recovery attack on the full round version of Spoc-64. Finally, we present an observation regarding the constants used in the sLiSCP-light permutation. To the best of our knowledge, this paper represents the first third-party analysis on both SpoC cipher and the sLiSCP-light permutation.

Available format(s)
Secret-key cryptography
Publication info
Preprint. MINOR revision.
Contact author(s)
lkraleva @ esat kuleuven be
raluca posteuca @ esat kuleuven be
2020-09-09: received
Short URL
Creative Commons Attribution


      author = {Liliya Kraleva and Raluca Posteuca and Vincent Rijmen},
      title = {Cryptanalysis of the permutation based algorithm SpoC},
      howpublished = {Cryptology ePrint Archive, Paper 2020/1072},
      year = {2020},
      note = {\url{}},
      url = {}
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