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Bellaso Cipher

Tool to decrypt/encrypt with Bellaso. Bellaso cipher created by Giovanni Battista Bellaso is a cryptographic poly-alphabetic process using one or two keys and adapted to the italian alphabet

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Bellaso Cipher -

Tag(s) : Cryptography,Poly-Alphabetic Cipher

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Bellaso Cipher

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Tool to decrypt/encrypt with Bellaso. Bellaso cipher created by Giovanni Battista Bellaso is a cryptographic poly-alphabetic process using one or two keys and adapted to the italian alphabet

Answers to Questions

How to encrypt using Bellaso cipher

Encryption uses an alphabet, the one of Bellaso was latin with 20 letters (U=V), a key to generate N alphabets from the first one and a cipher key.

Let the alphabet be ABCDEFGHILMNOPQRSTVX, CHIAVEALPHABET the key to generate 5 alphabets and CHIAVE the ciphering key. One want to crypt 'DCODE ME'.

The message is split into words. For the ith word of the message, one get the ith letter of the key (modulo key length) and one substitutes using the alphabet for the ith letter.

Word 1 : DCODE, Word 2 = ME

1st letter of the key : C, alphabet for C = CHIAVDFGMN/ELPBTOQRSX, DCODE becomes OEDOC

2nd letter of the key : H, alphabet pour H = CHIAVDFGMN/XELPBTOQRS, ME becomes RH

The message becomes : 'OEDOC RH'

How to decrypt Bellaso cipher

Decryption is identical to encryption.

How to generate Bellaso alphabets

One must take distinct letters of the generating key and split it in half

CHIAVEALPHABET becomes CHIAVELPBT so CHIAV and ELPBT

The two parts are filled with remaining letters in order to make it reversible

CHIAVDFGMN / ELPBTOQRSX

To generate the next N-1 alphabets, one has to keep the first part but make a rotation of i times n character of the second part.

i=1, n=1, ELPBTOQRSX becomes XELPBTOQRS

i=2, n=1, ELPBTOQRSX becomes SXELPBTOQR

For each letter of the alphabet 1 is associated one of the N generated alphabet, in order, ie, the first letter is associated to the first alphabet, the second letter to the second alphabet, etc.

If one has N=5 alphabets, C,H,I,A,V,D,F,G,M,N,E,L,P etc. are associated, respectively to alphabets 1,2,3,4,5,1,2,3,4,5,1,2,3 etc.

How to recognize an Bellaso ciphered text?

The ciphered message has a smaller index of coincidencehref than to the language of the plain text.

In its original version, only 20 characters are used (latin alphabet, U=V)

In its original version, the message has word-separators.

How to decipher Bellaso without key?

It is hard. However it is possible to find the number N of alphabet by analyzing frequency of one word out of N.

When Bellaso have been invented?

A book describing the process of Bellaso is dated 1553.

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Team dCode read all messages and answer them if you leave an email (not published). It is thanks to you that dCode has the best Bellaso Cipher tool. Thank you.


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