Existing comment:
Encryption Device
1547–1559
French
This device, which belonged to King Henry II of France, encrypts messages using a "polyalphabetic" system rather than a single, fixed rearrangement of the alphabet. For example, sender and receiver might agree on the following set of variable transpositions: the first letter of the message shifts by one position, the second by two, the third by three, and so on. This would produce the following code: * * METROPOLITAN MUSEUM OF ART * NGWVTVVTRDLZ ZIHULE HZ VNM |