CryptoAlgorithms

CryptoAlgorithms is a python package that incorporates some of the most common entry-level ciphers. This package only works using any version of Python 3

• Github Repo: The repository where the most up to date version of this code lives.

Executing Main Program

Using Makefile/Bash Script

Prerequisite: The desired input file must be in the root directory. Default: CryptoAlgorithms/

Execute:

$ make bin
$ ./cipher.sh *<CIPHER TAG> <KEY> <ENC/DEC> <INPUT FILE> <OUTPUT FILE>*

Further instructions for the Cipher tags and corresponding keys is included below. ENC if you would like to encrypt the input file. DEC if you would like to decrypt the input file.

Executing Directly Using Python3

Prerequisite: The desired input file must be in the src/main directory.

First, navigate to the src/main directory.

Execute:

python cipher.py <CIPHER TAG> <KEY> <ENC/DEC> <INPUT FILE> <OUTPUT FILE>

Further instructions for the Cipher tags and corresponding keys is included below. ENC if you would like to encrypt the input file. DEC if you would like to decrypt the input file.

Caesar

<CIPHER TAG> - CES

<KEY> - A single integer value indicating the desired alphabetic offset for encryption. For convenience, any nonnegative integer key is allowed, but there are only 25 unique encryption keys modulo 26.

Sample command:

python cipher.py CIG 17 ENC ./input.txt ./output.txt

This command maps:

PT      CT
A  <->  R
B  <->  S
C  <->  T
. . . . .
I  <->  Z
J  <->  A
K  <->  B
L  <->  C
. . . . .
Y  <->  P
Z  <->  Q

Monoalphabetic

<CIPHER TAG> - MAC

<KEY> - A string that contains every character of the English alphabet exactly once. That is, no non-alphabetic character is permitted, and no duplicate characters are permitted.

Sample command:

python cipher.py MAC RMUTOECGVXZKJFWLPDHYIANQBS ENC ./input.txt ./output.txt

This command maps:

PT      CT
A  <->  R
B  <->  M
C  <->  U
. . . . .
X  <->  Q
Y  <->  B
Z  <->  S

Playfair

<CIPHER TAG> - PLF

<KEY> - A string that only contains alphabetic characters. Duplicate characters are permitted, but will be ignored when setting the key matrix.

Sample command:

python cipher.py PLF occurrence ENC ./input.txt ./output.txt

This results in the Playfair Matrix:

O	C	U	R	E
N	A	B	D	F
G	H	I/J	K	L
M	P	Q	S	T
V	W	X	Y	Z

Railfence

<CIPHER TAG> - RFC

<KEY> - A single integer value (or string containing one integer) denoting the number of rows desired for the railfence cipher.

Sample command:

python cipher.py RFC 3 ENC ./input.txt ./output.txt

With three rows, this text becomes:

W  H  R  R  S  I  E  B  O  S
 I  T  E  O  T  S  X  E  M
  T  H  E  W  H  T  T  C  E

RowTransposition

<CIPHER TAG> - RTS

<KEY> - A string of integer values, either separated by spaces or in a continuous block (only if largest value is less than 10). The key denotes the row transpositions desired, and as such must contain every single integer from 1 - N, where N is the largest integer value in the string.

Sample command:

python cipher.py RTS 153264 ENC ./input.txt ./output.txt

Alternate command:

python cipher.py RTS "1 5 3 2 6 4" ENC ./input.txt ./output.txt

ROWS
1	2	3	4	5	6
S	A	M	P	L	E
P	L	A	I	N	T
E	X	T	I	N	S
I	D	E	F	I	L
E	X	X	X	X	X

TRANSPOSED ROWS
1	5	3	2	6	4
S	L	M	A	E	P
P	N	A	L	T	I
E	N	T	X	S	I
I	I	E	D	L	F
E	X	X	X	X	X

Vigenere

<CIPHER TAG> - VIG

<KEY> - A string containing only alphabetic characters. The string will be duplicated until it "covers" the entire plaintext.

Sample command:

python cipher.py VIG AEIQZADXCJABC ENC ./input.txt ./output.txt

Plaintext:

Heythereletsgooutside

Key:

AEIQZADXCJABC

Key Becomes:

AEIQZADXCJABCAEIQZADX

Hill

THIS IS ONLY PARTIALLY IMPLEMENTED. AS OF RIGHT NOW ONLY THE ENCRYPTION IS IMPLEMENTED

<CIPHER TAG> - HIL

<KEY> - A string containing only numbers. The string must contain a perfect square number of integers to generate a NxN matrix for this Cipher.

Sample command:

python cipher.py HIL "6 24 1 13 16 10 20 17 15" ENC ./input.txt ./output.txt

Key Becomes:

6	24	1
13	16	10
20	17	15