This is the code used for the simulations and tests described in the paper entitled "Private linkage of international trade microdata in a cloud-based secure enclave" to appear in a special issue of the Statistical Journal of the International Association of Official Statistics (SJIAOS). It runs in Google Colab. It may run outside Colab with appropriate changes. You must create a folder called "PSI" under "Colab Notebooks" in your Google drive. In this folder, upload the files "firm_names.csv", "product_codes.csv" and "r_functions.R".