The passports contain a digital signature and a DSC (Document Signing Certificate). This DSC is signed by a CSCA certificate which you can download from the ICA

The passports contain a digital signature and a DSC (Document Signing Certificate). This DSC is signed by a CSCA certificate which you can download from the ICAO Public Key Directory. Link here: https://pkddownloadsg.icao.int/ https://pkddownloadsg.icao.int/