Nywila
2D Key (2-Dimensional Key)   ni ufunguo wa miraba miwili ambayo ni njia pembejeo muhimu ikiwa na ufunguo mitindo wa multiline Passphrase, crossword, ASCII / Unicode art, na textual semantic noises kwa hiari, ili kujenga nywila /ufunguo kubwa zaidi ya 128 bits kwa kutambua MePKC (Memorizable Public-Key Cryptography) kutumia funguo zinazoweza kukumbukwa kikamilifu katika teknolojia ya sasa ya private key management kama vile encrypted private key, split private key, na roaming private key.