Title: Clauis Steganographiae Ioannis Trithemij, abbatis Spanheimensis, ad Serenissimum Principem Dn. Philippum ..
First published: 1621
Subjects: Early works to 1800, Ciphers, Cryptography
People: Johannes Trithemius (1462-1516)
LC classification: Z103 .T84 1621