This is the 5423rd most frequent Japanese word.
ninsho
Ninsho (認証) means "authentication" or "certification" in English.
ninsho (証明) is used here to refer to the verification process of one's identity.
身分証明書を提示して、本人確認を行う必要があります。
You need to show an ID to verify your identity.
ninsho (認証) is used here to denote official recognition or certification.
この資格は国際的に認証されています。
This certification is internationally recognized.
ninsho (認証書) refers to a document certifying or authorizing something.