Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:an alternate construction by Okamoto [25] based on RSA, and the Ong-Schnorr [26] scheme based on factoring) also have the three mentioned properties and are therefore leakage-resilient as well.
Category: