Security may be provided in a form of a digital certificate of authenticity.Logical formLearned from2 sentences. Persons may question an authenticity.Logical formLearned from2 sentences. An authenticity may pertain-to an outline.Logical formLearned from2 sentences. An attack can be upon an authenticity of poems.Logical formLearned from2 sentences. Authenticity may require that something-is-the-case.Logical formLearned from2 sentences. An object can be constituted-of-or-filled-with authenticity.Logical formLearned from2 sentences. A painting may show authenticity.Logical formLearned from2 sentences. Persons may choose an object of authenticity.Logical formLearned from2 sentences. An identifier may guarantee authenticity.Logical formLearned from2 sentences. A word can be in authenticity.Logical formLearned from2 sentences. Doubts can be about an authenticity of an e-mail.Logical formLearned from2 sentences. Certificates may support an authenticity.Logical formLearned from2 sentences. An authenticity may pertain-to a credential.Logical formLearned from2 sentences. Parties may question an authenticity of records by challenging a reliability of a (computer program).Logical formLearned from2 sentences. Parties may challenge an authenticity of records by questioning.Logical formLearned from2 sentences.