e/Two-square cipher

Information
has gloss	eng: The Two-square cipher, also called double Playfair, is a manual symmetric encryption technique. It was developed to ease the cumbersome nature of the large encryption/decryption matrix used in the four-square cipher while still being slightly stronger than the (single-square) Playfair cipher.
lexicalization	eng: two-square cipher
instance of	c/Classical ciphers