Classical ciphers

## Project description

https://pypi.org/project/secretpy

Documentation:

Source code & Development:

https://github.com/tigertv/secretpy

## Description

SecretPy is a cryptographic Python package. It uses the following classical cipher algorithms:

• Affine

• Atbash

• Bazeries

• Beaufort

• Caesar, Caesar Progressive

• Chaocipher

• Keyword

• Playfair, Two Square(Double Playfair), Three Square, Four Square

• Rot13, Rot5, Rot18, Rot47

• Simple Substitution

• Transposition: Columnar, Scytale, Spiral, Myszkowski, Zigzag(Railfence)

• Vic

• Vigenere, Autokey, Gronsfeld, Porta

## Installation

To install this library, you can use pip:

pip install secretpy

Alternatively, you can install the package using the repo’s cloning and the make:

git clone https://github.com/tigertv/secretpy
cd secretpy
make install

## Usage

### Direct way

The cipher classes can encrypt only characters which exist in the alphabet, and they don’t have a state.

from secretpy import Caesar, alphabets as al

def encdec(cipher, plaintext, key, alphabet=al.ENGLISH):
print('========================================================================================')
print(plaintext)
enc = cipher.encrypt(plaintext, key, alphabet)
print(enc)
print(cipher.decrypt(enc, key, alphabet))

key = 3
cipher = Caesar()

plaintext = u"thequickbrownfoxjumpsoverthelazydog"
encdec(cipher, plaintext, key)

alphabet = al.GERMAN
plaintext = u"schweißgequältvomödentextzürnttypografjakob"
encdec(cipher, plaintext, key, alphabet)

alphabet = al.SWEDISH
plaintext = u"faqomschweizklövdutrångpjäxby"
encdec(cipher, plaintext, key, alphabet)

'''
Output:

========================================================================================
thequickbrownfoxjumpsoverthelazydog
wkhtxlfneurzqiramxpsvryhuwkhodcbgrj
thequickbrownfoxjumpsoverthelazydog
========================================================================================
schweißgequältvomödentextzürnttypografjakob
vfkzhlcjhtxßowyrpaghqwhäwübuqwwösrjudimdnre
schweißgequältvomödentextzürnttypografjakob
========================================================================================
faqomschweizklövdutrångpjäxby
idtrpvfkzhlönocygxwuaqjsmbåeä
faqomschweizklövdutrångpjäxby
'''

### CryptMachine

CryptMachine saves a state. There are alphabet, key and cipher, they can be changed at anytime. In the previous example, plaintext contains only characters existing in the alphabet i.e. without spaces and etc. To change the behaviour, you can use CryptMachine and decorators(SaveAll, Block), so it’s a preferred way to do encryption/decryption:

from secretpy import Caesar, CryptMachine, alphabets as al
from secretpy.cmdecorators import SaveAll, Block

def encdec(machine, plaintext):
print("--------------------------------------------------------------------")
print(plaintext)
enc = machine.encrypt(plaintext)
print(enc)
print(machine.decrypt(enc))

key = 3
cipher = Caesar()
cm0 = CryptMachine(cipher, key)

cm = cm0
cm.set_alphabet(al.ENGLISH)
plaintext = "I don't love non-alphabet characters. I will remove all of them: ^,&@$~(*;?&#. Great!" encdec(cm, plaintext) cm = Block(cm, length=5, sep="-") plaintext = "This text is divided by blocks of length 5!" encdec(cm, plaintext) cm = SaveAll(cm0) plaintext = "I love non-alphabet characters. These are : ^,&@$~(*;?&#. That's it!"
encdec(cm, plaintext)

cm.set_alphabet(al.ENGLISH_SQUARE_IJ)
plaintext = "Jj becomes Ii because we use ENGLISH_SQUARE_IJ!"
encdec(cm, plaintext)

cm.set_alphabet(al.JAPANESE_HIRAGANA)
cm.set_key(1)
plaintext = u"text あい だやぎへぐゆぢ"
encdec(cm, plaintext)

'''
Output:

--------------------------------------------------------------------
I don't love non-alphabet characters. I will remove all of them: ^,&@$~(*;?&#. Great! lgrqworyhqrqdoskdehwfkdudfwhuvlzloouhpryhdooriwkhpjuhdw idontlovenonalphabetcharactersiwillremoveallofthemgreat -------------------------------------------------------------------- This text is divided by blocks of length 5! wklvw-hawlv-glylg-hgebe-orfnv-riohq-jwk thistextisdividedbyblocksoflength -------------------------------------------------------------------- I love non-alphabet characters. These are : ^,&@$~(*;?&#. That's it!
L oryh qrq-doskdehw fkdudfwhuv. Wkhvh duh : ^,&@$~(*;?&#. Wkdw'v lw! I love non-alphabet characters. These are : ^,&@$~(*;?&#. That's it!
--------------------------------------------------------------------
Jj becomes Ii because we use ENGLISH_SQUARE_IJ!
Mm ehfrphv Mm ehfdxvh zh xvh HQKOMVL_VTXDUH_MM!
Ii becomes Ii because we use ENGLISH_SQUARE_II!
--------------------------------------------------------------------
text あい だやぎへぐゆぢ
text いう ぢゆぐほげよづ
text あい だやぎへぐゆぢ
'''

### CompositeMachine

Combining several ciphers to get more complex cipher, you can use CompositeMachine:

from secretpy import Rot13, Caesar, CryptMachine, CompositeMachine
from secretpy.cmdecorators import SaveAll

def encdec(machine, plaintext):
print("=======================================")
print(plaintext)
enc = machine.encrypt(plaintext)
print(enc)
dec = machine.decrypt(enc)
print(dec)

key = 5
plaintext = u"Dog jumps four times and cat six times"
print(plaintext)

cm1 = SaveAll(CryptMachine(Caesar(), key))
enc = cm1.encrypt(plaintext)
print(enc)

cm2 = SaveAll(CryptMachine(Rot13()))
enc = cm2.encrypt(enc)
print(enc)

print("=======================================")

cm = CompositeMachine(cm1)
enc = cm.encrypt(plaintext)
print(enc)
encdec(cm, plaintext)

encdec(cm, plaintext)

'''
Output:

Dog jumps four times and cat six times
Itl ozrux ktzw ynrjx fsi hfy xnc ynrjx
Vgy bmehk xgmj laewk sfv usl kap laewk
=======================================
Vgy bmehk xgmj laewk sfv usl kap laewk
=======================================
Dog jumps four times and cat six times
Vgy bmehk xgmj laewk sfv usl kap laewk
Dog jumps four times and cat six times
=======================================
Dog jumps four times and cat six times
Nyq tewzc pyeb dswoc kxn mkd csh dswoc
Dog jumps four times and cat six times

'''

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