Wittgensteins secret diaries : semiotic writing in cryptography Introduction: silence and secrecy Symptoms Cryptography Cryptomnesia Fact or fiction Cryptosemiotician Tentative conclusion Appendix: list of coded passages from Wittgensteins Nachlass. Ludwig Wittgensteins works encompass a huge number of published philosophical manuscripts notebooks lectures remarks and responses as well as his unpublished private diaries. The diaries were written mainly in coded script to interpolate his writings on the philosophy of language with autobiographic passages but were previously unknown to the public and impossible to decode without learning the coding system. This book deciphers the cryptography of the diary entries to examine what Wittgensteins personal idiom reveals about his public and private identities. Employing the semiotic doctrine of Charles S. Peirce Dinda L. Gorlée argues that the style of writing reflects the variety of Wittgensteins emotional moods which were profoundly affected by his medical symptoms. Bringing Peirces reasoning of abduction together with induction and deduction the book investigates how the semiosis of the emotional energetic and logical interpretations of signs and objects reveal Wittgensteins psychological states in the coded diaries.