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ad proposed the plan—a man who called himself the Teacher。 Although the Teacher and Silas never met face…to…face； each time they spoke by phone； Silas was awed； both by the profundity of the Teacher's faith and by the scope of his power。 The Teacher seemed to be a man who knew all； a man with eyes and ears in all places。 How the Teacher gathered his information； Silas did not know； but Aringarosa had placed enormous trust in the Teacher； and he had told Silas to do the same。 〃Do as the Teacher mands you；〃 the bishop told Silas。 〃And we will be victorious。〃
Victorious。 Silas now gazed at the bare floor and feared victory had eluded them。 The Teacher had been tricked。 The keystone was a devious dead end。 And with the deception； all hope had vanished。
Silas wished he could call Bishop Aringarosa and warn him； but the Teacher had removed all their lines of direct munication tonight。 For our safety。
Finally； overing enormous trepidation； Silas crawled to his feet and found his robe； which lay on the floor。 He dug his cell phone from the pocket。 Hanging his head in shame； he dialed。
〃Teacher；〃 he whispered； 〃all is lost。〃 Silas truthfully told the man how he had been tricked。
〃You lose your faith too quickly；〃 the Teacher replied。 〃I have just received news。 Most unexpected and wele。 The secret lives。 Jacques Saunière transferred information before he died。 I will call you soon。 Our work tonight is not yet done。〃
CHAPTER 47
Riding inside the dimly lit cargo hold of the armored truck was like being transported inside a cell for solitary confinement。 Langdon fought the all too familiar anxiety that haunted him in confined spaces。 Vernet said he would take us a safe distance out of the city。 Where？ How far？
Langdon's legs had gotten stiff from sitting cross…legged on the metal floor； and he shifted his position； wincing to feel the blood pouring back into his lower body。 In his arms； he still clutched the bizarre treasure they had extricated from the bank。
〃I think we're on the highway now；〃 Sophie whispered。
Langdon sensed the same thing。 The truck； after an unnerving pause atop the bank ramp； had moved on； snaking left and right for a minute or two； and was now accelerating to what felt like top speed。 Beneath them； the bulletproof tires hummed on smooth pavement。 Forcing his attention to the rosewood box in his arms； Langdon laid the precious bundle on the floor； unwrapped his jacket； and extracted the box； pulling it toward him。 Sophie shifted her position so they were sitting side by side。 Langdon suddenly felt like they were two kids huddled over a Christmas present。
In contrast to the warm colors of the rosewood box； the inlaid rose had been crafted of a pale wood； probably ash； which shone clearly in the dim light。 The Rose。 Entire armies and religions had been built on this symbol； as had secret societies。 The Rosicrucians。 The Knights of the Rosy Cross。
〃Go ahead；〃 Sophie said。 〃Open it。〃
Langdon took a deep breath。 Reaching for the lid； he stole one more admiring glance at the intricate woodwork and then； unhooking the clasp； he opened the lid； revealing the object within。
Langdon had harbored several fantasies about what they might find inside this box； but clearly he had been wrong on every account。 Nestled snugly inside the box's heavily padded interior of crimson silk lay an object Langdon could not even begin to prehend。
Crafted of polished white marble； it was a stone cylinder approximately the dimensions of a tennis ball can。 More plicated than a simple column of stone； however； the cylinder appeared to have been assembled in many pieces。 Six doughnut…sized disks of marble had been stacked and affixed to one another within a delicate brass framework。 It looked like some kind of tubular； multiwheeled kaleidoscope。 Each end of the cylinder was affixed with an end cap； also marble； making it impossible to see inside。 Having heard liquid within； Langdon assumed the cylinder was hollow。
As mystifying as the construction of the cylinder was； however； it was the engravings around the tube's circumference that drew Langdon's primary focus。 Each of the six disks had been carefully carved with the same unlikely series of letters—the entire alphabet。 The lettered cylinder reminded Langdon of one of his childhood toys—a rod threaded with lettered tumblers that could be rotated to spell different words。
〃Amazing； isn't it？〃 Sophie whispered。
Langdon glanced up。 〃I don't know。 What the hell is it？〃
Now there was a glint in Sophie's eye。 〃My grandfather used to craft these as a hobby。 They were invented by Leonardo da Vinci。〃
Even in the diffuse light； Sophie could see Langdon's surprise。
〃Da Vinci？〃 he muttered； looking again at the canister。
〃Yes。 It's called a cryptex。 According to my grandfather； the blueprints e from one of Da Vinci's secret diaries。〃
〃What is it for？〃
Considering tonight's events； Sophie knew the answer might have some interesting implications。 〃It's a vault；〃 she said。 〃For storing secret information。〃
Langdon's eyes widened further。
Sophie explained that creating models of Da Vinci's inventions was one of her grandfather's best…loved hobbies。 A talented craftsman who spent hours in his wood and metal shop； Jacques Saunière enjoyed imitating master craftsmen—Fabergé； assorted cloisonne artisans； and the less artistic； but far more practical； Leonardo da Vinci。
Even a cursory glance through Da Vinci's journals revealed why the luminary was as notorious for his lack of follow…through as he was famous for his brilliance。 Da Vinci had drawn up blueprints for hundreds of inventions he had never built。 One of Jacques Saunière's favorite pastimes was bringing Da Vinci's more obscure brainstorms to life—timepieces； water pumps； cryptexes； and even a fully articulated model of a medieval French knight； which now stood proudly on the desk in his office。 Designed by Da Vinci in 1495 as an outgrowth of his earliest anatomy and kinesiology studies； the internal mechanism of the robot knight possessed accurate joints and tendons； and was designed to sit up； wave its arms； and move its head via a flexible neck while opening and closing an anatomically correct jaw。 This armor…clad knight； Sophie had always believed； was the most beautiful object her grandfather had ever built。。。 that was； until she had seen the cryptex in this rosewood box。
〃He made me one of these when I was little；〃 Sophie said。 〃But I've never seen one so ornate and large。〃
Langdon's eyes had never left the box。 〃I've never heard of a cryptex。〃
Sophie was not surprised。 Most of Leonardo's unbuilt inventions had never been studied or even named。 The term cryptex possibly had been her grandfather's creation； an apt title for this device that used the science of cryptology to protect information written on the contained scroll or codex。
Da Vinci had been a cryptology pioneer； Sophie knew； although he was seldom given credit。 Sophie's university instructors； while presenting puter encryption methods for securing data； praised modern cryptologists like Zimmerman and Schneier but failed to mention that it was Leonardo who had invented one of the first rudimentary forms of public key encryption centuries ago。 Sophie's grandfather； of course； had been the one to tell her all about that。
As their armored truck roared down the highway； Sophie explained to Langdon that the cryptex had been Da Vinci's solution to the dilemma of sending secure messages over long distances。 In an era without telephones or e…mail； anyone wanting to convey private information to someone far away had no option but to write it down and then trust a messenger to carry the letter。 Unfortunately； if a messenger suspected the letter might contain valuable information； he could make far more money selling the information to adversaries than he could delivering the letter properly。
Many great minds in history had invented cryptologic solutions to the challenge of data protection： Julius Caesar devised a code…writing scheme called the Caesar Box； Mary； Queen of Scots created a transposition cipher and sent secret muniqués from prison； and the brilliant Arab scientist Abu Yusuf Ismail al…Kindi protected his secrets with an ingeniously conceived polyalphabeti