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A digital envelope is primarily designed to ensure confidentiality when transmitting sensitive data over networks. It accomplishes this by combining the use of symmetric encryption for the data itself and asymmetric encryption to encrypt the symmetric key used for that data. As a result, only the intended recipient, who possesses the corresponding private key, can decrypt the symmetric key and access the data. This method guarantees that even if the data is intercepted during transmission, it remains unintelligible to unauthorized parties, thus safeguarding its confidentiality.

While integrity and authenticity are important concepts associated with data security, they are not the primary focus of a digital envelope. The mechanism does not inherently provide non-repudiation either; that concept typically involves additional measures, such as digital signatures, which authenticate the origin of the data and provide proof of sending.

In summary, the primary function of a digital envelope is to ensure that the information remains confidential through secure encryption processes, allowing only authorized parties to access the data.