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Book Cipher

Tool to decrypt/encrypt with a book cipher. The book cipher uses a book as an encryption index, each letter is coded by the rank of a word in the book.

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Book Cipher - dCode

Tag(s) : Cryptography, Substitution Cipher

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Book Cipher

Cryptography
Book Cipher

Book Cipher Decoder

Book ciphertext

Book/Text used as key/index/dictionary

When in the course of human Events, it becomes necessary for one People to dissolve the Political Bands which have connected them with another, and to assume among the Powers of the Earth, the separate and equal Station to which the Laws of Nature and of Natures God entitle them, a decent Respect to the Opinions of Mankind requires that they should declare the causes which impel them to the Separation.
We hold these Truths to be self-evident, that all Men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty, and the pursuit of Happiness?-That to secure these Rights, Governments are instituted among Men, deriving their just Powers from the Consent of the Governed, that whenever any Form of Government becomes destructive of these Ends, it is the Right of the People to alter or abolish it, and to institute a new Government, laying its Foundation on such Principles, and organizing its Powers in such Form, as to them shall seem most likely to effect their Safety and Happiness. Prudence, indeed, will dictate that Governments long established should not be changed for light and transient Causes; and accordingly all Experience hath shewn, that Mankind are more disposed to suffer, while Evils are sufferable, than to right themselves by abolishing the Forms to which they are accustomed. But when a long Train of Abuses and Usurpations, pursuing invariably the same Object, evinces a Design to reduce them under absolute Despotism, it is their Right, it is their Duty, to throw off such Government, and to provide new Guards for their future Security. Such has been the patient Sufferance of these Colonies; and such is now the Necessity which constrains them to alter their former Systems of Government. The History of the Present King of Great-Britain is a History of repeated Injuries and Usurpations, all having in direct Object the Establishment of an absolute Tyranny over these States. To prove this, let Facts be submitted to a candid World.
He has refused his Assent to Laws, the most wholesome and necessary for the public Good.
He has forbidden his Governors to pass Laws of immediate and pressing Importance, unless suspended in their Operation till his Assent should be obtained; and when so suspended, he has utterly neglected to attend to them.
He has refused to pass other Laws for the Accommodation of large Districts of People; unless those People would relinquish the Right of Representation in the Legislature, a Right inestimable to them, and formidable to Tyrants only.
He has called together Legislative Bodies at Places unusual, uncomfortable, and distant from the Depository of their public Records, for the sole Purpose of fatiguing them into Compliance with his Measures.
He has dissolved Representative Houses repeatedly, for opposing with manly Firmness his Invasions on the Rights of the People.
He has refused for a long Time, after such Dissolutions, to cause others to be elected; whereby the Legislative Powers, incapable of Annihilation, have returned to the People at large for their exercise; the State remaining in the mean time exposed to all the Dangers of Invasion from without, and Convulsions within.
He has endeavoured to prevent the Population of these States; for that Purpose obstructing the Laws for Naturalization of Foreigners; refusing to pass others to encourage their Migrations hither, and raising the Conditions of new Appropriations of Lands.
He has obstructed the Administration of Justice, by refusing his Assent to Laws for establishing Judiciary Powers.
He has made Judges dependent on his Will alone, for the Tenure of their Offices, and Amount and Payment of their Salaries.
He has erected a Multitude of new Offices, and sent hither Swarms of Officers to harass our People, and eat out their Substance.
He has kept among us, in Times of Peace, Standing Armies, without the consent of our Legislature.
He has affected to render the Military independent of and superior to the Civil Power.
He has combined with others to subject us to a Jurisdiction foreign to our Constitution, and unacknowledged by our Laws; giving his Assent to their Acts of pretended Legislation:
For quartering large Bodies of Armed Troops among us:
For protecting them, by a mock Trial, from Punishment for any Murders which they should commit on the Inhabitants of these States:
For cutting off our Trade with all Parts of the World:
For imposing taxes on us without our Consent:
For depriving us, in many Cases, of the Benefits of Trial by Jury:
For transporting us beyond Seas to be tried for pretended Offences:
For abolishing the free System of English Laws in a neighbouring Province, establishing therein an arbitrary Government, and enlarging its Boundaries, so as to render it at once an Example and fit Instrument for introducing the same absolute Rule in these Colonies:
For taking away our Charters, abolishing our most valuable Laws, and altering fundamentally the Forms of our Governments:
For suspending our own Legislatures, and declaring themselves invested with Powers to legislate for us in all Cases whatsoever.
He has abdicated Government here, by declaring us out of his Protection and waging War against us.
He has plundered our Seas, ravaged our Coasts, burnt our Towns, and destroyed the Lives of our People.
He is, at this Time, transporting large Armies of foreign Mercenaries to compleat the Works of Death, Desolation, and Tyranny, already begun with circumstances of Cruelty and Perfidy, scarcely paralleled in the most barbarous Ages, and totally unworthy the Head of a civilized Nation.
He has constrained our fellow Citizens taken Captive on the high Seas to bear Arms against their Country, to become the Executioners of their Friends and Brethren, or to fall themselves by their Hands.
He has excited domestic Insurrections among us, and has endeavoured to bring on the Inhabitants of our Frontiers, the merciless Indian Savages, whose known Rule of Warfare, is an undistinguished Destruction, of all Ages, Sexes and Conditions.
In every stage of these Oppressions we have Petitioned for Redress in the most humble Terms: Our repeated Petitions have been answered only by repeated Injury. A Prince, whose Character is thus marked by every act which may define a Tyrant, is unfit to be the Ruler of a free People.
Nor have we been wanting in Attentions to our British Brethren. We have warned them from Time to Time of Attempts by their Legislature to extend an unwarrantable Jurisdiction over us. We have reminded them of the Circumstances of our Emigration and Settlement here. We have appealed to their native Justice and Magnanimity, and we have conjured them by the Ties of our common Kindred to disavow these Usurpations, which, would inevitably interrupt our Connections and Correspondence. They too have been deaf to the Voice of Justice and of Consanguinity. We must, therefore, acquiesce in the Necessity, which denounces our Separation, and hold them, as we hold the rest of Mankind, Enemies in War, in Peace, Friends.
We, therefore, the Representatives of the UNITED STATES OF AMERICA, in General Congress, Assembled, appealing to the Supreme Judge of the World for the Rectitude of our Intentions, do, in the Name, and by the Authority of the good People of these Colonies, solemnly Publish and Declare, That these United Colonies are, and of Right ought to be, Free and Independent States; that they are absolved from all Allegiance to the British Crown, and that all political Connection between them and the State of Great-Britain, is and ought to be totally dissolved; and that as Free and Independent States, they have full Power to levy War, conclude Peace, contract Alliances, establish Commerce, and to do all other Acts and Things which Independent States may of right do. And for the support of this Declaration, with a firm Reliance on the Protection of the divine Providence, we mutually pledge to each other our Lives, our Fortunes, and our sacred Honor.

Extract

The first letter of the word
The complete word

➠ Letters Extraction

Book Cipher Encoder

Book cipher plaintext

Book/Text used as key/index/dictionary

Extract

The first letter of the word
The complete word

➠ Letters Extraction

Tool to decrypt/encrypt with a book cipher. The book cipher uses a book as an encryption index, each letter is coded by the rank of a word in the book.

Answers to Questions

How to encrypt using Book cipher?

The Book cipher encryption consists of indexing a text by numbering from 1 to n each word. A letter (or a word) is coded by the number of the word beginning with that same letter (or the whole word).

Choose a well-defined text or book in order to have a precise word list and to facilitate decoding.

Example: The default example of dCode use the Declaration of Independence of the United States of America. To encode DCODE, therefore, the words 'DISSOLVE, COURSE, ONE, DECENT, EVENTS' can be taken to the respective indexes 15,4,12,52,7 that describe the coded message.

How to decrypt a Book cipher?

Book cipher decryption consists in retrieving the word corresponding to the number and extracting the latter or only its first letter.

Example: For 221,132,136,305 the words are BY,OF,OF,KING or (if we take the first letters) BOOK.

How are words counted?

Any sequence of 1 to n consecutive letters (or digits) (not interrupted by any other character) is considered as a word.

Example: ALICE'S ADVENTURES IN WONDERLAND contains 5 words: ALICE,S,ADVENTURES,IN,WONDERLAND

How to recognize a Book ciphertext?

The message usually consists of several numbers, from a few tens to sometimes a thousand for the big books (but it is rare because it requires to count up to 1000 words of the book).

How to decipher a text without the book?

Without knowing the dictionary used it is impossible to decode this cipher.

What are the variants of the book cipher?

Beale has proposed three cryptograms, one of which (the second one, called the Beale cipher) is coded by this principle. It uses precisely as a dictionary the declaration of independence of the United States of America.

When Book cipher have been invented ?

The first traces of the book cipher are datet from the invention of printing.

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Source code

dCode retains ownership of the source code of the script Book Cipher online. Except explicit open source licence (indicated Creative Commons / free), any algorithm, applet, snippet, software (converter, solver, encryption / decryption, encoding / decoding, ciphering / deciphering, translator), or any function (convert, solve, decrypt, encrypt, decipher, cipher, decode, code, translate) written in any informatic langauge (PHP, Java, C#, Python, Javascript, Matlab, etc.) which dCode owns rights will not be given for free. So if you need to download the online Book Cipher script for offline use, check contact page !

Questions / Comments

Summary

Book Cipher Decoder
Book Cipher Encoder

How to encrypt using Book cipher?
How to decrypt a Book cipher?
How are words counted?
How to recognize a Book ciphertext?
How to decipher a text without the book?
What are the variants of the book cipher?
When Book cipher have been invented ?

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