Positive developments in recent years in solving problems of digital signature. The article describe a number of problems that do not allow internal and external cross-certification of electronic keys. Directions to overcome them to comply with EU standards. Further improvement and development of the National System of electronic signature requires a comprehensive, mutually solve a wide range of issues.
digital signature, cross-certification, cryptographic protection
"Do rishennia zadach elektronnoho tsyfrovoho pidpysu" [To solving the problem of electronic signatures],
Information Processing Systems,