| Subject | English | Portuguese |
| comp., MS, Braz. | public key infrastructure hierarchy | hierarquia de infraestrutura de chave pública (A hierarchy in which the roles of the certification authority are separated into one root CA and one or more subordinate CAs) |
| comp., MS | public key infrastructure hierarchy | hierarquia de infraestrutura de chaves públicas (A hierarchy in which the roles of the certification authority are separated into one root CA and one or more subordinate CAs) |