authenticate

tr.v., -cat·ed, -cat·ing, -cates.
To establish the authenticity of; prove genuine: a specialist who authenticated the antique samovar. See synonyms at confirm.

authentication au·then'ti·ca'tion n.
authenticator au·then'ti·ca'tor n.

(1) To verify (guarantee) the identity of a person or company. To ensure that the individual or organization is really who it says it is. See authentication and digital certificate.

(2) To verify (guarantee) that data has not been altered. See message integrity and data integrity.

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verb

1. To assure the certainty or validity of: attest, back (up), bear out, confirm, corroborate, evidence, justify, substantiate, testify (to), validate, verify, warrant. See support/oppose, true/false.
2. To establish as true or genuine: bear out, confirm, corroborate, demonstrate, endorse, establish, evidence, prove, show, substantiate, validate, verify. See show/hide, support/oppose.

(DOD) A challenge given by voice or electrical means to attest to the authenticity of a message or transmission.

Dansk (Danish)
v. tr. - autensificere, fastslå ægtheden af

Nederlands (Dutch)
waarmerken, bevestigen, legaliseren

Français (French)
v. tr. - authentifier, légaliser

Deutsch (German)
v. - beglaubigen, bestätigen

Ελληνική (Greek)
v. - επισημοποιώ, επικυρώνω, βεβαιώνω τη γνησιότητα

Italiano (Italian)
autenticare

Português (Portuguese)
v. - autenticar, validar, legalizar, certificar

Русский (Russian)
удостоверять

Español (Spanish)
v. tr. - autenticar, autentificar, certificar, legalizar

Svenska (Swedish)
v. - bestyrka, verifiera

中文（简体）(Chinese (Simplified))
证实, 证明, 鉴定

中文（繁體）(Chinese (Traditional))
v. tr. - 證實, 證明, 鑒定

한국어 (Korean)
v. tr. - 을 확증을 세우다, 진짜임을 보증하다

日本語 (Japanese)
v. - 本物であることを証明する, 確証する

العربيه (Arabic)
‏(فعل) يوثق, اثبات صحه وأصاله‏

עברית (Hebrew)
v. tr. - ‮וידא, אישר‬

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