OBS_VALUE: Before 11/2018, a foreign digital signature is recognized in Vietnam only if the institutions that certificated such digital signature are from a country that had signed or acceded to international agreements with Vietnam about this domain and have representative offices in Vietnam. Since 11/2018, these conditions were lifted. As long as the intuitions are operating lawfully their country and satisfying the standards of the Vietnamese Ministry of Information and Communication or international standards with equivalent information security (certified by professional international auditing enterprises), their certificated digital signatures are legally valid and effective as those granted by Vietnamese authorities.