DH Key Agreement with IPP Cryptography

[legion]

I need to generate private/public key pair using Diffie-Hellman Key Agreement scheme.

Domain parameters that I must use are stored in PKCS#3-defined format.

DHParameter ::= SEQUENCE {

prime INTEER, -- p

base INTEGER -- g

privateValueLength INTEGER OPTIONAL }

Therefore I have only a prime P and a generator G , as well as an optional bitlength of the private value L.

I'd like to ask if there's any way to set up a DLP cryptosystem using these parameters only?

All my current attempts failed - IPP seems to work with DH agreement scheme subgroups specifically, andthat require additional prime Q domain parameter that is not available (or is there any way to derive it from the above parameters?)

Any help would be greately appreciated....

[Vladimir_Dudnik]

Hello,

you need to have all three parameters to build complete system. Usually, the third parameter is defined at system design stage and depend on required level of security.

Regards,
Vladimir