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.
| Cipher | Type | Division B | Division C | ||
|---|---|---|---|---|---|
| Regional/Invitational | State/National | Regional/Invitational | State/National | ||
| AtBash | Monoalphabetic | Decode | |||
| 3.e.ix | |||||
| Caesar | Monoalphabetic | Decode | |||
| 3.e.x. | |||||
| Aristocrat Random, K1, K2 | Monoalphabetic | Decode+Cryptanalysis | Decode+Cryptanalysis | ||
| 3.e.i (1) | 3.e.i (1) | ||||
| Aristocrat Misspelled | Monoalphabetic | Decode+Cryptanalysis | Decode+Cryptanalysis | ||
| 3.e.i (2) | 3.e.i (2) | ||||
| Patristocrat | Monoalphabetic | Decode+Cryptanalysis | Decode+Cryptanalysis | ||
| 3.e.i (3) | 3.e.i (3) | ||||
| Xenocrypt | Monoalphabetic Language | Decode+Cryptanalysis (0 or 1) | Decode+Cryptanalysis (1+) | Decode+Cryptanalysis (0 or 1) | Decode+Cryptanalysis (2+) |
| 3.e.iii | 3.f.ii. | 3.e.iv | 3.f.ii. | ||
| Aristocrat, Patristocrat, Xenocrypt K3 | Monoalphabetic | Decode+Cryptanalysis | |||
| 3.e.i. | |||||
| Aristocrat, Patristocrat, Xenocrypt Keyword | Monoalphabetic | Keyword | |||
| 3.e.ii. | |||||
| Hill 2x2 | Polyalphabetic Math | Decode | |||
| 3.e.x. | |||||
| Hill 3x3 | Polyalphabetic Math | Decode | |||
| 3.f.iv. | |||||
| Affine | Monoalphabetic Math | Decode | Decode+Cryptanalysis | ||
| 3.e.xi. | 3.f.iv. | ||||
| Cryptarithm (Base 10) | Monoalphabetic Math | Decode+Cryptanalysis | Decode+Cryptanalysis | ||
| 3.e.v. | 3.e.vi. | ||||
| Baconian | Steganography | Cryptanalysis | Cryptanalysis | ||
| 3.e.ii. | 3.e.iii. | ||||
| Fractionated Morse | Tomogrammic | Decode+Cryptanalysis | Decode+Cryptanalysis | ||
| 3.e.iv. | 3.e.v. | ||||
| Porta | Polyalphabetic | Decode | Cryptanalysis | Decode | Decode+Cryptanalysis |
| 3.e.vi. | 3.f.iii. | 3.e.vii. | 3.f.iii. | ||
| Nihilist | Polybius Square | Decode | Cryptanalysis | Decode | Decode+Cryptanalysis |
| 3.e.viii. | 3.f.v. | 3.e.ix. | 3.f.v. | ||
| Complete Columnar | Transposition | Cryptanalysis | Cryptanalysis | ||
| 3.e.vii. | 3.e.viii. | 3.f.vi. | |||