polyalphabetic
| polyalphabetic abbr. | |
| cryptogr. | многоалфавитный |
| |||
| многоалфавитный (Alex_Odeychuk) | |||
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polyalphabetic : 14 phrases in 5 subjects |
| Cryptography | 1 |
| Electronics | 4 |
| Information security and data protection | 4 |
| Military | 1 |
| Security systems | 4 |