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Five short, cited answers on the revision, the date, applicability, the mechanism families and the evidence to keep. Each links to the clause pages behind it.
What changes in the fourth edition?
The fourth edition replaces the 2009 text and revisits the five mechanism families, their security requirements, key production, exchanges, object identifiers and parameter
When will the fourth edition be published?
ISO has not published a date. The DIS ballot opened on 17 September 2026 and runs twelve weeks. The planning date on this site, 16 September 2027, is an outer estimate, not an ISO
Does it apply to my organisation?
Only if a contract, a scheme, a regulator or your own policy points at it. The standard binds nobody by itself. It applies in practice when you run an entity authentication
Which mechanisms does it cover?
Five families: identity based mechanisms, integer factorization, discrete logarithms over prime or composite moduli, asymmetric encryption systems, and discrete logarithms on
What evidence should we keep?
The mechanism inventory, the parameter review with the constraint behind each value, the verifier negative tests and the object identifier inventory. Those four are what an
Not legal advice; does not certify.