David Kahn

The magnificent, unrivaled history of codes and ciphers—how they're made, how they're broken, and the many and fascinating roles they've played since the dawn of civilization in war, business, diplomacy, and espionage—updated with a new chapter on computer cryptography and the Ultra secret.Man has created codes to keep secrets and has broken codes to learn those secrets since the time of the Pharaohs. For 4,000 years, fierce battles have been waged between codemakers and codebreakers, and the story of these battles is civilization's secret history, the hidden account of how wars were won and lost, diplomatic intrigues foiled, business secrets stolen, governments ruined, computers hacked. From the XYZ Affair to the Dreyfus Affair, from the Gallic War to the Persian Gulf, from Druidic runes and the kaballah to outer space, from the Zimmermann telegram to Enigma to the Manhattan Project, codebreaking has shaped the course of human events to an extent beyond any easy reckoning. Once a government monopoly, cryptology today touches everybody. It secures the Internet, keeps e-mail private, maintains the integrity of cash machine transactions, and scrambles TV signals on unpaid-for channels. David Kahn's The Codebreakers takes the measure of what codes and codebreaking have meant in human history in a single comprehensive account, astonishing in its scope and enthralling in its execution. Hailed upon first publication as a book likely to become the definitive work of its kind, The Codebreakers has more than lived up to that it remains unsurpassed. With a brilliant new chapter that makes use of previously classified documents to bring the book thoroughly up to date, and to explore the myriad ways computer codes and their hackers are changing all of our lives, The Codebreakers is the skeleton key to a thousand thrilling true stories of intrigue, mystery, and adventure. It is a masterpiece of the historian's art.

Among the famous battles of World War II, the longest and most critical was the Battle of the Atlantic--the struggle between the American convoys bringing supplies to Britain and the German U-boats bent on severing that lifeline. No matter where else on earth conflicts raged, leaders on both sides understood that whoever won the Battle of the Atlantic would win the war. From the start, Germany had the advantage with the diabolically devised encryption machine known as Enigma. Breaking the Enigma codes became the singleminded obsession of a brilliant band of mathematicians, chess champions, and linguists who labored on behalf of the Allied cause behind closed doors at an English estate called Bletchley Park. In this book, cryptologist David Kahn recounts the story of the dramatic race between codemakers and codebreakers, focusing on the personalities involved, describing the at-sea captures of encryption keys that led to the Allied breakthrough, and depicting the enormous impact this information had on the most cataclysmic war in history. B&W photos.

Master the moves of krav maga― the international self-defense and physical fitness sensationIncreasingly popular around the world, krav maga is the renowned hand-to-hand Martial Arts defense fighting designed by the Israeli military forces. Swift, powerful, and simple, it is an effective method for fending off any kind of attacker―and it is also an amazing workout.Regardless of size, strength, and fitness level, anyone can master the essentials of krav maga― and reap the rewards of increased safety, confidence, and conditioning. With moves you can learn in as little as five minutes, or train and practice for long-term success, Krav Maga covers all the *What is Krav Maga all about*Instruction on how to protect your body's vulnerable target and learn weapons defense combat*Use an opponent's momentum to fuel your counterattack*Escape all kinds of grips and holds*Combine training punches, kicks, and other moves into a powerful conditioning workout--to lose weight, increase core strength, and improve muscle tone*Use specially designed drills and a 12-week training program to become a kravist--a smart and prepared fighterWritten by one of America's foremost krav maga experts, this exciting new guide opens the door to an empowering and important set of techniques that you or anyone can master.

A German patrol wiggles through Russian lines to return with details of Soviet defenses. An expert Luftwaffe interrogator teases secret information from downed Allied airmen. Two spies steal ashore in Maine and make their way into New York City. Filled with episodes of intrigue and adventure, Hitler's Spies reveals the workings of German intelligence—the famed Abwehr, the dreaded SD, the codebreakers, the spies, and the intelligence gatherers of the Foreign Office—and explains its failure to best the Allies. Draws on original documents and extensive interviews.

Get in the best shape of your life and master real fighting techniques with Advanced Krav MagaBased on the principles of enhancing natural instincts and using appropriate force for self-protection and weapons defense, anyone can master the moves of krav maga – the international self-defense Martial Arts and physical fitness sensation designed by the Israel Defense Forces.This follow up to Krav An Essential Guide to the Renowned Method - for Fitness and Self-Defense , explores essential combative tactics including standing, clinch, and extensive groundwork from yellow, orange and green belt levels, to help you update and improve your skills. In this guide to advance techniques and training, David Kahn will teach *How krav maga saved Ernest Kovary, Imi Lichtenfeld's oldest living student, the day World War II began*The mindset of effective self-defense*Upper and lower body combatives and defenses*Powerful retzev workouts*New techniques for mastering escapes against chokes, grabs, and takedowns*Krav maga groundwork and instruction*Women's self-defense principlesRegardless of strength, size, age, or gender, you can learn advanced techniques for fending off any attacker – swiftly, powerfully, and simply. And the conditioning you will achieve by practicing these techniques will tone your muscles, improve your reflexes, and get you fighting fit. From the American expert and Israeli Grandmaster Haim Gidon's United States representative in the fitness and combat techniques of krav maga, this is the most up to date, authoritative, and advanced guide to real fighting techniques and rigorous conditioning.

David Kahn, U.S. Chief Instructor of the Israeli Krav Maga Association, is back again with Krav Maga How to Defend Yourself Against the 12 Most Common Street Attacks . Created by the Israeli army for self-defense, krav maga is gaining popularity around the world―especially here in the United States. Kahn is a self-defense expert, teacher, and served as a board member of the original Israeli Krav Maga Association.Kahn will teach you how to gain the upper hand in the twelve most common unarmed street attacks the average person is likely to encounter. He’ll show you how to outmaneuver takedowns, rear chokes, ambush attacks, sucker punches while texting, knees to the groin, among other street safety skills.Kahn has instructed everyone from members at the local Y to executives, celebrities, and all major federal U.S. law enforcement agencies, as well as all five branches of the U.S. military. His simple, no-nonsense approach to self-defense is perfect for men and women of all fitness levels. Don’t become tomorrow’s headline; Krav Maga Defense will teach you to protect yourself today.

Winner 2013 USA Best Books AwardWinner - 2013 IP's Book AwardFinalist 2013 Book of the Year Award by ForeWord MagazineRegardless of strength, size, age, or gender, you can learn krav maga techniques to fend off an armed attacker. Israeli Krav Maga is the Israel Defense Force s official self-defense system. The system is simple, instinctive, adaptable, and if necessary, brutally effective to thwart a life threatening assault. Krav maga is particularly world renowned for its weapon defenses. This book presents the most up-to-date and effective techniques to prevail against armed threats and attacks. These techniques are incorporated into the green, blue, brown, and black belt levels of the Israeli krav maga curriculum. Many of these updated defenses have never been seen before. Grandmaster Haim Gidon has improved and evolved this material with the late krav maga founder Imi Lichtenfeld s formal approval. Contents include these important topics: Weapon awareness training; functionality, range, and deployment Dominant control holds over a stunned assailant Edged weapon defenses Impact weapon defenses Handgun defenses Rifle defenses Defending against weapons while on the ground Defending against continuous attacks Non-conventional weapon threats First-party hostage situations Kravist weapon defense drillsThe conditioning and hand-eye coordination achieved by practicing these techniques will tone your muscles, improve your reflexes, and get you street prepared. This is the most up-to-date, authoritative, and advanced guide to the world s premier weapons defense tactics.

BECAUSE NOT ALL KRAV MAGA IS THE SAME ™ Israeli krav maga is the official self-defense system of the Israel Defense Forces. Krav maga training shares the same principles for civilians, law enforcement, and military personnel alike to deliver them from harm's way. Goals however, are different for law enforcement and military personnel. This book is designed for security-conscious civilians, law enforcement officers, military personnel, and security professionals alike who want to improve their chances of not just surviving an armed attack, but increase the odds of prevailing without serious injury. Krav maga's popularity in professional law enforcement, military, and security circles is attributable to its practicality, simplicity, quick retention, easy learning curve, and brutal effectiveness. This effectiveness is built on a few core tenets and simple building blocks. General principles are applied and customized to suit the needs of a dynamic violent situation. Contents The most up-to-date tactics presented in this book focus on the most common violent scenarios. These techniques derive from the author's translation of the Israeli Krav Maga Association (IKMA) curriculum. The IKMA is the governing body for krav maga, recognized by the Israeli government and headed by Grandmaster Haim Gidon. Responsible people seek krav maga training as a shield against violence.

One of the most colourful and controversial figures in American intelligence, Herbert O. Yardley (1889-1958) gave America its best form of information, but his fame rests more on his indiscretions than on his achievements. In this highly readable biography, a premier historian of military intelligence tells Yardley's story and evaluates his impact on the American intelligence community. Yardley established the nation's first codebreaking agency in 1917, and his solutions helped the United States win a major diplomatic victory at the 1921 disarmament conference. But when his unit was closed in 1929 because "gentlemen do not read each other's mail", Yardley wrote a best-selling memoir that introduced - and disclosed - codemaking and codebreaking to the public. David Kahn describes the vicissitudes of Yardley's career, including his work in China and Canada, offers a capsule history of American intelligence up to World War I, and gives a short course in classical codes and ciphers. He debunks the accusations that the publication of Yardley's book caused Japan to change its codes and ciphers and that Yardley traitorously sold his solutions to Japan.

In Kahn on Codes, David Kahn, America's foremost authority on codes, ciphers, and spies, gives us a far-ranging look at the new cryptology - from its standard use in warfare to its growing impact on industry. "Cryptology has gone public," Kahn writes. "A field that was once the exclusive domain of governments has become a concern of businesses and individuals."In this absorbing and eclectic collection, Kahn expertly explores the crytographer's world, leading us into and through its dark labyrinths. We learn about the legendary Herbert O. Yardley's "lost manuscript," investigate the origins of polyalphabetic substitution, and follow the adventures of Hans-Thilo Schmidt- whom Kahn calls the greates spy of World War II.Among the other fascinating sections in Kahn on Codes: * Codebreaking in World Wars I & II: Their Major Successes and Failures, Their Causes and Effects * Lgcn Otuu Wllwgh W1 Etfown, or, "They Will Attack at Midway" * Ciphers and Computers * The Soviet Spy Ciphers used by Reino Hayhanen and Rudolf Abel * Public Versus Private Cryptology * Codes in Context * Opportunities in CryptologyKahn on Codes also includes a list of cryptological terms, endnotes, and index.

Why are some people more effective leaders? What makes them more engaging, more influential, and more successful than their peers? In the award-winning book Cape, Spandex, Briefcase leadership expert David Kahn tells the story of a motivated young man who yearns to be successful in his new leadership role. He holds the manager title, but is struggling to become an actual leader. After an especially horrific experience, he is sent to a leadership coach…but why is this “expert” working in a comic book shop? With Superman, Spider-Man and their costumed companions serving as paradigms of what it means to be a leader, this book introduces the “Five Superpowers of Leaders” and presents us with practical tools and skills necessary to motivate teams and earn respect. A few endorsements for Cape, Spandex, Briefcase “… The book is spot on for new leaders and those who want to up their skill set. Kahn clearly understands how relationships are the basis of a successful leader.” — JOHN BALDONI, Top 50 Inc.com Leadership Expert and author of 13 books including The Secret to Bold and Gutsy Leadership “…For anyone who feels overwhelmed or even plateaued at work, pick up Cape, Spandex, Briefcase and prepare to fly!” — MARSHALL GOLDSMITH, Top 50 Thinker and bestselling author of Triggers, MOJO, and What Got You Here Won’t Get You There “If you have the courage and conviction to be a great leader you’ve found the perfect book…” — VERNE HARNISH, bestselling author of Scaling a Few Companies Make It…and Why the Rest Don’t (Rockefeller Habits 2.0) “…Whether you’re an entrepreneur who wants to grow your company, a manager trying to up your game, or someone aspiring to be in a leadership role, this book belongs on your desk.” — KEVIN KRUSE, bestselling author of Employee Engagement 2.0 “…you’ll have unexpected fun and get to the bottom of some of the most important issues for true excellence in anything you do.” — TOM MORRIS, Author of such books as If Aristotle Ran General Motors, Superheroes and Philosophy, and The Oasis Within “…This compelling story helps the reader think differently about one’s self and others. In the process, Kahn achieves what every great author dreams of, namely, writing a book that drives personal and professional change.” — ORRIN WOODWARD, Guinness World Record Holder, Inc Magazine Top 20 Leader and NY Times Bestselling Author About the author DAVID KAHN, Ph.D. is a student and teacher of inspirational leaders – how they foster trust, how they develop a culture that is both engaging and geared towards strategic objectives, and how they motivate others to exceed preconceived limits of excellence. An active practitioner, theorist, consultant, and speaker, you can read more of his work on leadersayswhat.com and in multiple publications.

BECAUSE NOT ALL KRAV MAGA IS THE SAME®This book is designed for krav maga trainees, security-conscious civilians, law enforcement officers, security professionals, and military personnel alike who wish to refine their essential krav maga combatives, improve their chances of surviving a hostile attack and prevail without serious injury.Combatives are the foundation of krav maga counter-attacks. These are the combatives of the original Israeli Krav Maga Association (Grandmaster Gidon).It is irrefutable that you need only learn a few core combatives to be an effective fighter. Simple is easy. Easy is effective. Effective is what is required to end a violent encounter quickly, decisively, and on your terms. This book stresses doing the right things and doing them in the right way. Right technique + Correct execution = Maximum Effect.Contents Key strategies for achieving maximum combative effects Krav maga’s 12 most effective combatives Developing power and balance Combatives for the upper and lower body Combative combinations and retzev (continuous combat motion) Combatives for takedowns and throws Combatives for armbars, leglocks, and chokesWhatever your martial arts or defensive tactics background or if you have no self-defense background at all, this book can add defensive combatives and combinations to your defensive repertoire. Our aim is to build a strong self-defense foundation through the ability to optimally counter-attack.

Spies, secret messages, and military intelligence have fascinated readers for centuries but never more than today, when terrorists threaten America and society depends so heavily on communications. Much of what was known about communications intelligence came first from David Kahn's pathbreaking book, The Codebreakers . Kahn, considered the dean of intelligence historians, is also the author of Hitler’s German Military Intelligence in World War II and Seizing the The Race to Break the German U-Boat Codes, 1939-1943, among other books and articles.Kahn’s latest book, How I Discovered World War II's Greatest Spy and Other Stories of Intelligence and Code , provides insights into the dark realm of intelligence and code that will fascinate cryptologists, intelligence personnel, and the millions interested in military history, espionage, and global affairs. It opens with Kahn telling how he discovered the identity of the man who sold key information about Germany’s Enigma machine during World War II that enabled Polish and then British codebreakers to read secret messages.Next Kahn addresses the question often asked about Pearl since we were breaking Japan’s codes, did President Roosevelt know that Japan was going to attack and let it happen to bring a reluctant nation into the war? Kahn looks into why Nazi Germany’s totalitarian intelligence was so poor, offers a theory of intelligence, explicates what Clausewitz said about intelligence, tells―on the basis of an interview with a head of Soviet codebreaking―something about Soviet Comint in the Cold War, and reveals how the Allies suppressed the second greatest secret of WWII.Providing an inside look into the efforts to gather and exploit intelligence during the past century, this book presents powerful ideas that can help guide present and future intelligence efforts. Though stories of WWII spying and codebreaking may seem worlds apart from social media security, computer viruses, and Internet surveillance, this book offers timeless lessons that may help today’s leaders avoid making the same mistakes that have helped bring at least one global power to its knees. The book includes a Foreword written by Bruce Schneier.

BECAUSE NOT ALL KRAV MAGA IS THE SAME®This book introduces and codifies big-picture thinking to take you to the next level of self-defense expertise. The material is designed to conform to your strengths; you need not conform to the system.In this latest volume from David Kahn, you will find practical, battle-tested stratagems and insights that are equally applicable across the spectrum of martial arts and fighting systems. The text is supported by 180 dynamic separate photo series representing a rich krav maga gamut of self-defense strategies and tactics.Topics The Best Use of a Training PartnerThe Difference Between Anger and RageRecognizing Your Own Triggers to Avoid ViolenceContending with Road RageConflict Avoidance and EscapePhysiological Reactions to Threats and ViolenceLegal Use of Force RequirementsDefensive (Dis)Engagement MindsetAnatomical Targeting and Self-ProtectionPreemptive Linear StrikesAbsorbing and Moving with an AttackFighting RangesCombatives Power and BalanceSelf-Defense Fight TimingTactical RetreatingWhen and How to CounterattackDefending against a Skilled FighterDeceptive FightingGround SurvivalDefending an AmbushMultiple OpponentsBreaking Up a FightAs good tactical minds generally think alike, whatever your martial arts or defensive tactics background, this book is designed to synergize any previous professional self-defense knowledge to enhance your personal survival blueprint.Krav Maga Fundamental Strategies draws on ideas and techniques from nearly every level of the Israeli Krav Maga curriculum, including violence avoidance and prevention. The result is an adaptable strategy supported by tried and true defensive tactics, coupled with sound defensive principles, all of which will serve to deliver you from harm’s way.

A short monograph on the cryptographic origins of Braille.

The code breakers

The Whole-School Montessori Handbook for Teachers and Administrators

Honey Suckle Rose, How High the Moon, Beware My Foolish Heart, St. Thomas, Triste, Don't Blame Me, It Had To Be You, Body & Soul

In this first supplement to our 1999 Whole-School Montessori Handbook, we look at new developments in the issues schools encounter every day. Again based on real documentation from Montessori schools throughout the U.S. and Canada, the supplement offers 300+ pages of nuts-and-bolts advice and model practices.