2023-2024 Season Science Olympiad Rules Summary

This table summarizes which types of ciphers are used for which division and events. It also indicates which official rule corresponds to this usage. Blank boxes indicate that the cipher is not used for that division/category of event.

CipherTypeDivision ADivision BDivision C
Regional/InvitationalState/NationalRegional/InvitationalState/National
PigPen/MasonicMonoalphabetic SymbolDecode  
Tap CodeMonoalphabeticDecode  
Dancing MenMonoalphabetic SymbolDecode  
VigenèrePolyalphabeticDecode  
AtbashMonoalphabeticDecodeDecode 
3.e.ix
CaesarMonoalphabeticDecodeDecode 
3.e.x.
Aristocrat
Random, K1, K2
MonoalphabeticDecodeDecode+CryptanalysisDecode+Cryptanalysis
Random Only3.e.i (1)3.e.i (1)
Aristocrat, Patristocrat, Xenocrypt
K3
Monoalphabetic  Decode+Cryptanalysis
3.e.i.
Aristocrat, Patristocrat, Xenocrypt
Keyword
Monoalphabetic  Keyword
3.e.ii.
Aristocrat MisspelledMonoalphabetic Decode+CryptanalysisDecode+Cryptanalysis
3.e.i (2)3.e.i (2)
PatristocratMonoalphabetic Decode+CryptanalysisDecode+Cryptanalysis
3.e.i (3)3.e.i (3)
XenocryptMonoalphabetic Language Decode+Cryptanalysis (0 or 1)Decode+Cryptanalysis (1+)Decode+Cryptanalysis (0 or 1)Decode+Cryptanalysis (2+)
3.e.iii3.f.ii.3.e.iv3.f.ii.
Cryptarithm
(Base 10)
Monoalphabetic Math Decode+CryptanalysisDecode+Cryptanalysis
3.e.v.3.e.vi.
BaconianSteganography CryptanalysisCryptanalysis
3.e.ii.3.e.iii.
Fractionated MorseTomogrammic Decode+CryptanalysisDecode+Cryptanalysis
3.e.iv.3.e.v.
PortaPolyalphabetic DecodeCryptanalysisDecodeDecode+Cryptanalysis
3.e.vi.3.f.iii.3.e.vii.3.f.iii.
Nihilist SubstitutionPolybius Square DecodeCryptanalysisDecodeDecode+Cryptanalysis
3.e.viii.3.f.v.3.e.ix.3.f.v.
Complete ColumnarTransposition CryptanalysisCryptanalysis
3.e.vii.3.e.viii.3.f.vi.
AffineMonoalphabetic Math DecodeDecode+Cryptanalysis 
3.e.xi.3.f.iv.
Hill 2x2Polyalphabetic Math  Decode
3.e.x.
Hill 3x3Polyalphabetic Math   Decode
3.f.iv.