e/Alberti cipher disk

Information
has gloss	eng: The Alberti cipher disk, also called formula, is a cipher disc which was described by Leon Battista Alberti in his treatise De Cifris of 1467. The device embodies the first example of polyalphabetic substitution with mixed alphabets and variable period, and is made up of two concentric disks, attached by a common pin, which can rotate one with respect to the other.
lexicalization	eng: Alberti Cipher Disk
instance of	c/Encryption devices

Media
media:img	Alberti cipher disk.JPG