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In the context of digital envelopes, efficiency refers to the minimization of the number of keys used for encryption. This concept is significant because in a digital envelope system, a symmetric key is often used to encrypt the actual data (the message), while an asymmetric public key is used to encrypt the symmetric key. By reducing the number of keys needed, the overall complexity of managing encryption keys is simplified, enhancing the practicality and operational efficiency of the encryption process. This approach balances security with ease of key management, making digital communications both secure and user-friendly. The focus on key minimization ensures that users can maintain strong encryption practices without the cumbersome task of handling numerous keys, which could lead to potential security vulnerabilities.

In contrast, while lower costs, reduced data processing time, and improved network speed are important aspects in different contexts of technology and security, they don't directly relate to the concept of efficiency as it pertains to the management and use of keys in a digital envelope.