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General encryption of the correspondence between King Philip II, the Royal Council and the viceroys of Naples and Sicily

Date
1570
Archive
National Archive of Catalonia
Document type
Textual
Reference code
ANC1-960-T-891
Link to the online document
Description

This document contains the encryption system used by the royal chancellery to communicate with the viceroys of Naples and Sicily. It is a sample of diplomatic sophistication and information security in the imperial administration. Its value lies in its uniqueness as a witness to the cryptographic codes used in 16th century Europe.