Communication Yesterday and Today: The Need to Ensure Information Security During Business Travel
1. Introduction: From Historical Ciphers to Today’s Need for Security and Confidentiality The problem of protecting information did not originate in the digital age. As early as the 15th and, above all, the 16th century, the great European powers—most notably the Spanish Empire—faced the need to transmit orders, instructions, and sensitive data without them falling […]


























































