On 4/16/19 4:09 PM, Paolo Bonzini wrote: > Useful does not mean secure, does it? PKZIP encryption was certainly > useful back in the day, but it was not secure. > Thanks for the comments, quite understand the concern about security because it is indeed so important. Many people may not hear about SM2, so it is natural to doubt its security. Actually SM2 is not just China standard, it is also ISO/IEC standard, this fact should give us some confidence about its security. You can get more information about SM2 from below ISO/IEC specification. https://www.iso.org/obp/ui/#iso:std:iso-iec:14888:-3:ed-4:v1:en -- Thanks Harry