Multivariate Cryptography Symbolic Computations Algebraic Graphs Code Base Cryptography Computer Algebra Extremal Graph Theory GIS protection Geometry of Simple Group of Lie type Graph Based Cipher Largest Schubert Cells Multivariare Cryptography Post Quantum Crypography Projective Geometries Schubert cell Stream ciphers computationally tame homomorphism flag variety graphs given by equations hidden Eulerian equation hidden discrete logarithm problem key exchange protocols linguistic graphs multiple composition property multivariate cryptography regular tree approximations subgroups of affine Cremona group symbolic walks алгебраїчні графи криптографія від багатьох змінних