At criminal proceedings, parties bring digital evidence at criminal trial to prove what they claim after data in digital form appears. However, digital evidence, likes other kinds of evidence, should be admissible in order to be provided to prove claimed facts at trial. Among rules and procedures to decide whether digital evidence is admissible, the hearsay rule and authentication process are significantly crucial. This article discusses the relationship between digital evidence and the hearsay rule and when this rule applies to digital evidence. In addition, this article also analyzes the authentication of digital evidence and tries to provide the practice with relative suggestions.