Cifra de cuatro cuadros (Spanish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Cifra de cuatro cuadros" in Spanish language version.

refsWebsite

Global rank Spanish rank

1practicalcryptography.com

low place

low place

low place

low place

practicalcryptography.com

http://practicalcryptography.com/ciphers/four-square-cipher

quadibloc.com

http://www.quadibloc.com/crypto/pp1321.htm