What is one key element that ensures the effectiveness of cryptographic measures?

The effectiveness of cryptographic measures largely hinges on the complexity of the algorithm used. A cryptographic algorithm's complexity ensures that it is difficult for unauthorized parties to decipher or break the encryption without the appropriate keys or knowledge. High complexity in the algorithm means that even with significant computational power, it would take an impractical amount of time to crack the encryption, thereby safeguarding sensitive information effectively.

In contrast, user familiarity with the system, the number of employees trained, and the ease of access do not fundamentally determine how secure the cryptographic measures themselves are. While these factors may contribute to the overall security posture of an organization, they do not affect the inherent strength of the cryptographic algorithms in place. Thus, the complexity of the algorithm remains a pivotal element in maintaining robust cryptographic security.