This page is for sharing a free book about boring stuff. This book is supposed to be a collection of history facts, riddles, challenges and their solutions. It will follow the following pseudo rule: described histories and facts are pseudo real, described techniques are pseudo documented, proofs are pseudo mathematical or follows some pseudo logical path, challenges and riddles are pseudo unique and pseudo error free and, finally, solutions are pseudo correct.
The book is not complete yet and never will be. That is why it is free and available for all. Time will increase the number of contents in the book, adding sections, paragraphs and new chapters, according also to your suggestions on the issues page (https://github.com/xseris/SFAS/issues).
01/02/2021
- Quadoo
- Fakoo
- Siedoo
28/01/2021
- Trouser Semaphore
- Hexahue
- Cistercian Numerals
11/01/2021
- Cardan Grill
- Modular Arithmetic - Modulo operator
- Modular Arithmetic - Congruence
- Modular Arithmetic - Residue classes
- Modular Arithmetic - Addition and subtraction
18/12/2020
- Hymmnos script
- Albeti cipher
- Tabula recta
- Trithemius cipher
- Vigenere cipher
- Autokey cipher
- Emission spectrum
02/04/2020
- New York Point
- Barbier
- Moon system
- Raphigraphy
27/03/2020
- Gerudo alphabet
- Sheikah alphabet
- Gnommish alphabet
- Dinotopian alphabet
- Matoran alphabet
13/12/2019
- Josephus problem
- Monty Hall problem
09/11/2019
- Goron alphabet
- Unown alphabet
- Tentai show
21/08/2019
- Signal Flags
- ICS
- NATO
19/08/2019
- Trifid cipher
- ADFGX cipher
- ADFGVX cipher
14/08/2019
- Polybius Square
- Knock Code
- Bifid Cipher
07/08/2019
- Enochian Alphabet
- The alphabet of the Magi
- Daggers Alphabet
- Nug-Soth
05/08/2019
- Solitaire cipher
03/08/2019
- Gold bug cipher
01/08/2019
- Columnar transposition ciphers
- Myszkowski transposition
29/07/2019
- Route cipher
28/07/2019
- Coordinate information hiding