{"product_id":"top-secret","title":"Top secret","description":"\u003cp\u003e\u003cstrong\u003eBook info:\u003c\/strong\u003e Top secret (Hardcover, 144 pages – Candlewick, 2004) – Candlewick, 2004. Language: Eng.\u003c\/p\u003e\n\u003cp\u003ePssst! Inside these TOP SECRET files is everything sneaky young agents need to know about making-and breaking-their own secret codes.Do you know the difference between a code and a cipher? Can you tell a St. Cyr slide from a Cardano grille? Did you know that a substitution cipher caused Mary Queen of Scots to lose her head? Don’t look now, but packed into this practical field guide is everything a young person needs to know about the art of concealment — making and breaking codes, mastering cipher systems, and experimenting with secret writing. Offering plenty of hands-on practice sessions, tips for creating a code-making kit, sidebars on secret codes in history, and an amusing pair of spies to illustrate techniques, Paul B. Janeczko’s tantalizing TOP SECRET won’t stay a secret for long.\u003c\/p\u003e","brand":"Paul B. Janeczko","offers":[{"title":"Default Title","offer_id":53098831413472,"sku":"9780763609719","price":200.19,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0813\/5681\/6608\/files\/21wWU5hgDUS.jpg?v=1781698860","url":"https:\/\/medicalbook.online\/products\/top-secret","provider":"medicalbook.online","version":"1.0","type":"link"}