ClassicalCryptography

This is a library that contains many classical cryptographic implementations. It is a assembly written 100% in C#. The framework version is .Net7。

It mainly implements the following types of classical ciphers

Transposition
Transposition2D
Replacement
Encoder
Calculation
Image
Sound
Undefined

Transposition

This type of cipher is a one-dimensional substitution cipher that only changes the order of characters without changing the content. The order is determined by a one-dimensional coordinate-based formula $f(L,x)$, where $L$ is the text length and $x$ is the coordinate index starting from 0.

This type of cipher includes the following

Reversecipher
TaketranslateCipher
TriangleCipher
JosephusCipher
Railfencecipher
OriginalRailFenceCipher

ReverseCipher

No key
read the text from right to left
code:

ReverseCipher.Cipher.Encrypt("012345");
//> 543210

TakeTranslateCipher

key $(n,k)$
key irreversible
The key is in string form of two VChar64 characters (which means n and k will not exceed 63)
flow chart:

graph TB
A(start)-->B{character count>n}
B--True-->C[take out n characters]
B--False-->D
C-->E{remaining characters>k}
E--True-->F[remaining characters are shifted left by k units]
F-->C
E--False-->D[remove the remaining characters]
D-->G(end)

Loading

input:

text	key	result
12345678	(2, 3)	12675834

process:

result	3	4	5	6	7	8
12	[3]	[4]	[5]	6	7	8
12	6	7	8	3	4	5
1267			[8]	[3]	[4]	5
1267			5	8	3	4
126758					3	4
12675834

code:

var key = TakeTranslateCipher.Key.FromString("23");
TakeTranslateCipher.Cipher.Encrypt("12345678", key);
//> 12675834

TriangleCipher

no key
add length to next square number

The text is arranged in rows to form an (isosceles right) triangle
Read text by column

input:

text	result
123456789	526137489

diagram:

		1
	2	3	4
5	6	7	8	9

code:

TriangleCipher.Cipher.Encrypt("123456789");
//> 526137489

JosephusCipher

JosephRing¹

key $m$
key irreversible
process:

Imagine everyone is in a circle and starts counting
When the $m$th person comes out
Then start counting again starting with the next person
Repeat steps 2 and 3 until everyone comes out

input:

text	key	result
123456	3	364251

process:

result	1	2	3	4	5	6
3	1	2	[1]	4	5	6
36	1	2	[1]	4	5	[2]
364	1	2	[1]	[3]	5	[2]
3642	1	[4]	[1]	[3]	5	[2]
36425	1	[4]	[1]	[3]	[5]	[2]
364251	[6]	[4]	[1]	[3]	[5]	[2]

code:

var key = JosephusCipher.Key.FromString("3");
JosephusCipher.Cipher.Encrypt("123456", key);
//> 364251

RailFenceCipher

Strictly speaking, this is not really a RailFenceCipher; It is ScytaleCipher²，OriginalRailFenceCipheris real RailFenceCipher，But this error is widespread.

key(word per group $n$)
process:

Arrange text into $n$ columns by rows
Read text in columns

input

text	key	result
RailFenceCipherTest	3	RlnChTtaFcieeieeprs

diagram:

R	a	i
l	F	e
n	c	e
C	i	p
h	e	r
T	e	s
t

code:

var key = RailFenceCipher.Key.FromString("3");
RailFenceCipher.Cipher.Encrypt("RailFenceCipherTest", key);
//> RlnChTtaFcieeieeprs

OriginalRailFenceCipher

OriginalRailFenceCipher³

key(rail number $m$)
process:

Write the plain text diagonally down a continuous "track" of an imaginary fence
Move up when you reach the bottom
Move down again when you reach the top
Repeat steps 3 and 4 until all characters are written
Read the text out line by line

input

text	key	result
WEAREDISCOVERED	6	WVEOEACRRSEEIDD

diagram:


E								O	E
	A						C			R
		R				S					E
			E		I							D
				D

code:

//Use the same key type as the RailFenceCipher
var key = RailFenceCipher.Key.FromString("6");
OriginalRailFenceCipher.Cipher.Encrypt("WEAREDISCOVERED", key);
//> WVEOEACRRSEEIDD

Transposition2D

This type of cipher is a two-dimensional substitution cipher that only changes the order of characters without changing the content. The order is determined by a two-dimensional coordinate-based formula $f(L,x,y)$, where $L$ is the length of the text, $x$ is the horizontal index starting from 0, and $y$ is the vertical index starting from 0.

This type of cipher includes the following

CycleTranspose
AdvancedRailfenceCipher
RotatingGrillesCipher
MagicSquareCipher
HilbertCurveCipher
SpiralCurveCipher
ArnoldCatMapCipher
VBakersMapCipher
JigsawCipher
FifteenPuzzle
SixteenPuzzle
TwiddlePuzzle

You can also specify the TranspositionCipher2D<T>.ByColumn property to control the direction of text composition.

CycleTranspose

key(permute pairs)
Fill the rect by length to the maximum width in the permute
process:

Write the text into a rectangle
The width is the maximum value in the permute pair
Swap the columns of text according to the permute pair
Read the text in order according to the order of the permute number

input

text	key	result
Sitdownplease!	(1,2,4)(3,5)	dSoitlwenp!a`se

process:

Text is arranged in 5 columns

S	i	t	d	o
w	n	p	l	e
a	s	e	!	`

Move column 1 to column 2, column 2 to column 4, column 4 to column 1

d	S	t	i	o
l	w	p	n	e
!	a	e	s	`

Move column 3 to column 5, and column 5 to column 3

d	S	o	i	t
l	w	e	n	p
!	a	`	s	e

code:

var key = CycleTranspose.Key.FromString("(1,2,4)(3,5)");
CycleTranspose.Cipher.Encrypt("Sitdownplease!", key);
//> dSoitlwenp!a`se

AdvancedRailFenceCipher

One does call it an advanced fence cipher, but it should be called ColumnarTransposition⁴

key(permut)
fill the length to a rectangle whose width is the length of the permut
process:

Arrange the text in rows to form a rectangle
The width of the rectangle is the length of the permut
Read the text in columns according to the order of the permut number

input:

text	key	result
eg1ML9mymEqtKzeN0	7,4,3,5,6,2,1	mz`9K`1E0gmNMq`Lt`eye

process:

Text is arranged in 7 columns

[7]	[4]	[3]	[5]	[6]	[2]	[1]
e	g	1	M	L	9	m
y	m	E	q	t	K	z
e	N	0	`	`	`	`

Fill the list in the order of 7,4,3,5,6,2,1

[1]	[2]	[3]	[4]	[5]	[6]	[7]
m	9	1	g	M	L	e
z	K	E	m	q	t	y
`	`	0	N	`	`	e

code:

var key = AdvancedRailFenceCipher.Key.FromString("7,4,3,5,6,2,1");
AdvancedRailFenceCipher.Cipher.Encrypt("eg1ML9mymEqtKzeN0", key);
//> mz`9K`1E0gmNMq`Lt`eye

You can also create permutations by word(By character encoding)

var permut = PermutHelper.WordToPermutation("KEYWORD");
//> 3,2,7,6,4,5,1
var key = AdvancedRailFenceCipher.Key.FromString(permut);
AdvancedRailFenceCipher.Cipher.Encrypt("eg1ML9mymEqtKzeN0", key);
//> mz`gmNeyeLt`9K`Mq`1E0

RotatingGrillesCipher

RotatingGrillesCipher⁵

key(grilles position)
Complement the length to a square with an even side length
process:

Prepare a $4n^2$ rectangle
Dig a hole at the specified location
Fill in the text at the corresponding position of the grid
Rotate the grid (clockwise rotation by default)
Repeat the steps 4 times
Read the results by row

The following is a valid grilles grid:
Each grid has 4 possible positions
So grilles represented by typeQuaterArray
This grilles grid is 0,0,0,0

█	█
█	█

This grilles grid is2,3,1,0
string form is4:tA==


	█
█
		█

input

text	key	result
meetmeattwelvepm	`4:tA==`	tmmveeewepeatlmt

procrss:
The initial situation is


	█
█
		█

Fill meet into the grid position and rotate the grid

	█	m
	e	█
e			█
█			t

Fill meat and rotate the grid

█	m	m
	e	e	█
e		█	a
t	█		t

Fill twel and rotate the grid

t	m	m	█
█	e	e	w
e	█	e	a
t	l	█	t

Fill vepm and rotate the grid

t	m	m	v
e	e	e	w
e	p	e	a
t	l	m	t

code:

var array = new QuaterArray(4);
array[0] = 2;
array[1] = 3;
array[2] = 1;
array[3] = 0;
var key = new RotatingGrillesCipher.Key(array);
//var key = RotatingGrillesCipher.Key.FromString("4:tA==");
RotatingGrillesCipher.Cipher.Encrypt("meetmeattwelvepm", key);
//> tmmveeewepeatlmt

You can also set the AntiClockwise property to rotate the grid anticlockwise

MagicSquareCipher

no key
Fill the length to make a square
process:

Construct an n-order magic square using a specific method (magic squares can have many orders, but only the order generated by the following method is used here)
- Odd-order magic square use Louberel(Siamese) method⁶
- Double even order magic square using symmetry exchange method⁷
- Even-order magic squares using Strachey method⁸
Read the words row by row according to the order of the magic square

Diagram of a magic square of order 3

8	1	6
3	5	7
4	9	2

code:

MagicSquareCipher.Cipher.Encrypt("123456789");
//> 816357492

HilbertCurveCipher

no key
Complement the length to a square whose side length is a power of 2
process:

Construct a Hilbert curve from the upper left corner to the lower left corner
Fill in the characters in order according to the path
Read text by line

The first 4 order Hilbert curves are shown in the figure

2nd order curve sequence diagram

1	4	5	6
2	3	8	7
15	14	9	10
16	13	12	11

code:

HilbertCurveCipher.Cipher.Encrypt("0123456789ABCDEF");
//> 03451276ED89FCBA

SpiralCurveCipher

key (column number)
Fill the rectangle with the length to the width of the column number
process:

From top left to top right
From top right to bottom right
From bottom right to bottom left
From bottom left to top left
Arrange text in spiral order without repetition or omission

Sequence diagram when the total number is 16 and the width is 4

1	2	3	4
12	13	14	5
11	16	15	6
10	9	8	7

code:

var key = new SpiralCurveCipher.Key(4);
SpiralCurveCipher.Cipher.Encrypt("0123456789ABCDEF", key);
//> 0123BCD4AFE59876

ArnoldCatMapCipher

ArnoldCatMapCipher⁹

no key
Fill the length to make a square
process:

The text is arranged into a $n^2$ square matrix
$x=(2x+y)\mod n$
$y=(x+y)\mod n$
Encrypt the text according to the transformed sequence

diagram:
process:

0	1	2	3
4	5	6	7
8	9	A	B
C	D	E	F

after map


4	1
	8	5	2
		C	9	6	3
				D	A	7
						E	B
								F

result

0	D	A	7
B	4	1	E
2	F	8	5
9	6	3	C

code:

ArnoldCatMapCipher.Cipher.Encrypt("0123456789ABCDEF");
//> 0DA7B41E2F85963C

VBakersMapCipher

VBakersMapCipher¹⁰

no key
Fill the length to make a square
The original version of the transformation formula is somewhat inconvenient, so the modified version is actually used. The specific demonstration process is as follows
Square of even order

0	1	2	3
4	5	6	7
8	9	A	B
C	D	E	F

Before folding

0	4	1	5	2	6	3	7
8	C	9	D	A	E	B	F

After folding

0	4	1	5
8	C	9	D
2	6	3	7
A	E	B	F

Square of odd order

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

Before folding

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

After folding

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

code:

VBakersMapCipher.Cipher.Encrypt("ABCDEFGHIJKLMNOPQRSTUWXYZ");
//> AFBGCKPLQMUWXYZHDIEJRNSOT

JigsawCipher

key(an integer partition)
Fill the length to make a square
process:

Arrange the text into a $n^2$ square matrix
Take a split of the integer $n$, ${p_1, p_2, ..., p_n}$
Divide the square matrix into $n$ blocks vertically
Divide each block into $p_i$ jigsaw puzzles of area $n$ in sequence
Right-align the remainder
Write the text in a specific order

The following figure shows the encrypted text using 1,5,2,3
code

var key = JigsawCipher.Key.FromString("1,2,1");
JigsawCipher.Cipher.Encrypt("0123456789ABCDEF", key);
//> F763E542DBA1C980

FifteenPuzzle

FifteenPuzzle¹¹

key(move steps)
Fill the length to make a square
process:

The text is arranged into a $n^2$ square matrix
The lower right corner is empty
Move the empty space and swap it with the adjacent content
After a series of moves, read out the square matrix

key type isQuaterArray
input

text	key	result
0123456789ABCDEF	`↑←←↓→`	012345678D9ACE_B

process:
step is ↑←←↓→

0	1	2	3
4	5	6	7
8	9	A	B
C	D	E	_

0	1	2	3
4	5	6	7
8	9	A	_
C	D	E	B

0	1	2	3
4	5	6	7
8	9	_	A
C	D	E	B

0	1	2	3
4	5	6	7
8	_	9	A
C	D	E	B

0	1	2	3
4	5	6	7
8	D	9	A
C	_	E	B

0	1	2	3
4	5	6	7
8	D	9	A
C	E	_	B

code:

var array = new QuaterArray(5);
array[0] = 1;
array[1] = 2;
array[2] = 2;
array[3] = 3;
array[4] = 0;
var key = new FifteenPuzzle.Key(array);
//var key = FifteenPuzzle.Key.FromString("5:awA=");
//var key = FifteenPuzzle.Key.FromString("↑←←↓→");
FifteenPuzzle.Cipher.Encrypt("0123456789ABCDE_", key);
//> 012345678D9ACE_B

SixteenPuzzle

key(move steps)
Fill the length to make a square
process:

Arrange the text into a $n^2$ square matrix
Move the entire row/column in a circular motion
Read the square matrix after a series of moves

The key is represented by positive and negative numbers representing rows and columns respectively, and the movement direction is right and down
input:

text	key	result
0123456789ABCDEF	`2,-3,1,4,-1`	F01E3426795B8CDA

process:

The initial situation is

0	1	2	3
4	5	6	7
8	9	A	B
C	D	E	F

Move row 2

0	1	2	3
7	4	5	6
8	9	A	B
C	D	E	F

Move column 3

0	1	E	3
7	4	2	6
8	9	5	B
C	D	A	F

Move rows 1 and 4

3	0	1	E
7	4	2	6
8	9	5	B
F	C	D	A

Move Column 1

F	0	1	E
3	4	2	6
7	9	5	B
8	C	D	A

code:

var key = SixteenPuzzle.Key.FromString("2,-3,1,4,-1");
SixteenPuzzle.Cipher.Encrypt("0123456789ABCDEF", key);
//> F01E3426795B8CDA

TwiddlePuzzle

key(twiddle position array)
Fill the length to make a square
process:

Arrange the text into a $n^2$ square matrix
Rotate clockwise around the specified 4 grids
Read the square matrix after a series of rotations

The number of the key represents the rotation position
input:

text	key	result
0123456789ABCDEF	`1,2,3,5`	412059638A7BCDEF

process:
The initial situation is

[0]	[1]	2	3
[4]	[5]	6	7
8	9	A	B
C	D	E	F

Move the 1st position

4	[0]	[2]	3
5	[1]	[6]	7
8	9	A	B
C	D	E	F

Move the 2nd position

4	1	[0]	[3]
5	6	[2]	[7]
8	9	A	B
C	D	E	F

Move the 3rd position

4	1	2	0
5	[6]	[7]	3
8	[9]	[A]	B
C	D	E	F

Move the 5th position

4	1	2	0
5	9	6	3
8	A	7	B
C	D	E	F

code:

var key = TwiddlePuzzle.Key.FromString("1,2,3,5");
TwiddlePuzzle.Cipher.Encrypt("0123456789ABCDEF", key);
//> 412059638A7BCDEF

Replacement

This type of cipher encrypts the text by replacing symbols in the plain text with other symbols.

This type of cipher includes the following

SingleReplacementCipher
MorseCode
CommercialCode
~~EnigmaMachine~~
Encoder
PLEncoding

SingleReplacementCipher

Monoalphabetic substitution ciphers, which map characters in the plaintext to another set of characters, include the following

AffineCipher

var cipher = new AffineCipher(5, 8);
cipher.Encrypt("abcdefghijklmnopqrstuvwxyz");
//> insxchmrwbglqvafkpuzejotyd

CeaserCipher`

var cipher = new CeaserCipher(3);
cipher.Encrypt("hello");
//> khoor

The following are members of CommonTables

QWERKeyboard
Atbash
ChinesePinyin
rot5
rot13
rot18(rot5+rot13)
rot47
Al Bhed(include japanese hiragana)
Dvorak
DvorakLeftHand
DvorakRightHand
Colemak
LIIGOLLayout
AZERTY
Asset
Carpalx
Minimak4Keys
Minimak8Keys
Minimak12Keys
Norman
Workman
MTOHOEM
Saurian
PartTimerDevil
IChingEightTrigramsBase64
火星文
TapCode
ADFGX
more...

MorseCode

A code that uses signal duration and discontinuity to indicate content, including the following categories

English letters + numbers + code(English)
Digital short code(ShortDigit)
Chinese Zhuyin code(ChineseZhuyin)

CommercialCode

Chinese Commercial Code¹²
use Digital short code
code:

CommercialCode.ToCodesString("中文");
//> 00222429
CommercialCode.ToMorse("中文");
//> .-/.-/...--/...--/...--/...../...--/-
CommercialCode.FromCodeString("71934316");
//> 电码
CommercialCode.FromMorse("-../..-/-/....-/...../....-/..-/--...");
//> 电码

EnigmaMachine

This feature is not yet complete

Encoder

Conversion between computer codes supports the following

The following are some methods in BaseEncoding

Base64
Base64URL
Base100¹³
Base2048¹⁴
Base65536¹⁵
Base32768¹⁶
Base32¹⁷
Base58(Bitcoin address encoding)
Base85¹⁸
Base16(Hex)
Base(Encode using any table)
2,4,8(BinaryEncoding)
Braille code¹⁹
Roman Numerals(RomanNumerals)

Pinyin NineKey(PinyinNineKey)

Default

PinyinNineKey.Default.LettersToCodes("HELLO");
//> 4232535363
PinyinNineKey.Default.ToCodes("拼音");
//> 714362934362
PinyinNineKey.Default.FromCodes("4232535363714362934362");
//> HELLOPINYIN

BubbleBabble²⁰

ChineseCommonBraille²¹

The choice of polyphones may not be correct, but you can specify the pinyin yourself
The following options are provided by ChineseCommonBraille.Settings
- AutoSimplify:Indicates that traditional Chinese characters are converted to simplified Chinese characters when encoding
- EncodeTonenote:Indicates that tones should be encoded (soft tone 5 will be ignored)
- EncodePunctuation:Indicates that punctuation marks should be encoded as follows 。，、；？！：“”‘’（）【】—…《》〈〉
- EncodeNumber:Indicates that a number should be encoded
- EncodeLetters:Indicates that English letters should be encoded
- DistinguishThird:Instructions should distinguish between “他她它”
- UseAbbreviations:Abbreviation rules for indicating partial tones
code:

ChineseCommonBraille.OutputPinyin.Encode("盲文编码说", out string? py);
//> ⠍⠦⠒⠂⠃⠩⠁⠍⠔⠄⠱⠺
//py> 盲(MANG2)文(WEN2)编(BIAN1)码(MA3)说(SHUI4)
ChineseCommonBraille.OutputPinyin.Encode("盲文编码说(shuo1)", out py);
//> ⠍⠦⠒⠂⠃⠩⠁⠍⠔⠄⠱⠕⠁
//py> 盲(MANG2)文(WEN2)编(BIAN1)码(MA3)说(SHUO1)

decode:

var bt = ChineseCommonBraille.Decodeable.Encode("谁水双举盲文编码就说(shuo1)指纹很准噶");
var py = ChineseCommonBraille.Decodeable.DecodePinyins(bt);
ChineseCommonBraille.Decodeable.ResolvePinyins(py);
//bt> ⠱⠮⠂⠱⠺⠄⠱⠶⠁⠛⠥⠄⠍⠦⠂⠒⠂⠃⠩⠁⠍⠔⠄⠛⠳⠆⠱⠕⠁⠌⠄⠒⠂⠓⠴⠄⠌⠒⠄⠛⠔⠂
//py> SH(I)EI2SH(I)[UI/WEI]3SH(I)[UANG/WANG]1[G/J][U/WU]3MANG2[UN/WEN]2B[IAN/YAN]1MA3[G/J][IU/YOU]4SH(I)[UO/WO]1ZH(I)3[UN/WEN]2[H/X]EN3ZH(I)[UN/WEN]3[G/J]A2
//> SHEI2SHUI3SHUANG1[G/J]U3MANG2WEN2BIAN1MA3JIU4SHUO1ZHI3WEN2HEN3ZHUN3GA2

FourCornerCode²²

ChinesePinyin²³

var pinyins = ChineseHelper.GetPinyinFromText("就是这样");
string.Join(',', pinyins.Select(py => py.ToZhuyin()));
//> ㄐㄧㄡ,ㄕ,ㄓㄜ,ㄧㄤ

You can also use ChinesePinyin.FromZhuyin to convert Zhuyin back to Pinyin

QuotedPrintable²⁴
UnicodeEncoding
UrlEncode(WebEncoding)
HtmlEncode(WebEncoding)
IPv6 address encoding(WebEncoding)
Base85ipv6 address encoding(WebEncoding)
PGP Word List(PGPWordList)²⁵

PLEncoding

Strongly related to programming languages, the following are supported

Bytes strings in Python
Punycode²⁶
PPEncode²⁷
AAEncode(js code that can be run directly in the browser)
JJEncode(js code that can be run directly in the browser)
Jother(js code that can be run directly in the browser)
Brainfuck²⁸(In fact, it also supports several extended instructions)

Calculation

Passwords calculated using a special custom algorithm implement the following

ShortHide5
RSASteganograph
PerfectShuffle

ShortHide5

It's too complicated to explain, you can just look at the code implementation

RSASteganograph

Generates a prime number with the specified prefix bytes and calculates the RSA private key
The generated private key can be used like a normal private key
You can specify to generate a key in XML or PEM format
code:

var text = "天空不会一直都晴朗的，偶尔会下些雨滴，也有吹起暴风雨的时候，景色会渐渐的改变。";
var pemkey = RSASteganograph.GenerateRSAPrivateKey(text, true);
//A RSA private key in pem format will be generated
RSASteganograph.GetTextFrom(pemkey);//Get the text

PerfectShuffle

PerfectShuffle²⁹

Perform 2 alternating perfect shuffles on the alphabet
Take the specified first letter as the result

Image

The encryption result is the password of the image, including the following

PigpenCipher
ColorfulBarcode
MoirePattern
WeaveCipher
CisterciansNumerals
Steganography
NotMosaic
PhantomTank
Stereogram
~~StringArtCipher~~

PigpenCipher

no key
Only handles plain English text
Standard version alphabet
Alphabet of variant versions

ColorfulBarcode

no key

The text is divided into 3 parts/6 parts
Generate 3/6 QR codes
The QR codes correspond to the RGB color channels (3 copies)
Please refer to the specific implementation for 6 groups of colors

An example of a 3-color QR code
3oX+o67864CwiRYVndetxFyZuy7T59Rv0gc9eUSKwU/kWbNy1PGbtfJrrE/s9Can0N5sbPyOcXedYvwEom6qmQqMlfLCwkpZrp3j

The 6-color QR code with the same content is

var plainText = "你想编码的内容";
var bitmap = ColorfulBarcode.Encode(plainText);//Generate 3-color QR code
var text = ColorfulBarcode.Recognize(bitmap);//Recognize 3-color QR code
bitmap = ColorfulBarcode.EncodeSixColor(plainText);//Generate 6-color QR code
text = ColorfulBarcode.RecognizeSixColor(bitmap);//Recognize 6-color QR code

MoirePattern

Supports non-embedded and embedded
Support custom stripe styles
Supports static content and multi-frame content
Static non-embedded example

MoirePattern.Font = new Font("微软雅黑", 36);
var bitmap = MoirePattern.DrawText("这是摩尔纹", 300, 80, MoirePatternTypes.DiagonalPatten);
bitmap.Save("E:/MoirePattern.png");

MoirePattern.FillPatten(bitmap, MoirePatternTypes.DiagonalPatten);

MoirePattern.FillPatten(bitmap, MoirePatternTypes.DiagonalPatten, removePatten: true);//remove patten

Embedded example, replacing the waveform stripes

MoirePattern.Font = new Font("微软雅黑", 36);
var bitmap = MoirePattern.DrawText("这是摩尔纹", 300, 80, MoirePatternTypes.SinWavePatten, true);
bitmap.Save("E:/MoirePatternEmbedded.png");

Considering the embedded presentation effect, only the stripe removal effect is selected

Example of moiré patterns across multiple frames

MoirePattern.Font = new Font("微软雅黑", 36);
var bitmap = MoirePattern.DrawTexts(new[] { "这", "是", "摩", "尔", "纹" }, 80, 80);
bitmap.Save("E:/Pattens.png");
MoirePattern.FillAndSavePattens(bitmap, 5, "E:/Pattens");

WeaveCipher

Square example

var bitmap = WeaveCipher.Encrypt("GOOD");
bitmap.Save("E:/WeaveCipher.png");
WeaveCipher.Decrypt(bitmap);
//> GOOD

Example with triangle

var bitmap = WeaveCipher.EncryptExtend("GOOD Night");
bitmap.Save("E:/WeaveCipherExtend.png");

CisterciansNumerals³⁰

Cistercians numbers, a 10000-base number system represented by specific symbols

code:

var bitmap = CisterciansNumerals.Encode(12345678);
bitmap.Save("E:/12345678.png");

Steganography

Image steganography, writing information in the LSB (least significant bit) of the image pixel color value

Standalone programs (not included in this library)
Winforms application(net6.0-windows)
存储库地址

NotMosaic

Encrypt the specified area of the image

Encrypt the specified rectangular area
Support password encryption
Use masks to adjust the effect
pictures:

code:

var bitmap = new Bitmap("E:/NotMosaicSample.png");
var rects = new Rectangle[]
{
    new Rectangle(100, 50, 100, 200),
};
bitmap = NotMosaic.Encrypt(bitmap, rects, out EncryptRegions encryptRegions, "123456");
bitmap.Save("E:/NotMosaicEncrypted.png");

NotMosaic.Decrypt(bitmap, encryptRegions, "123456").Save("E:/NotMosaicDecrypted.png");

PhantomTank

Phantom Tank uses color matching and blending to make the image show different content against a black and white background.

Support color images
images:

code:

PhantomTank.Combine(new Bitmap("E:/Foreground.png"), new Bitmap("E:/Background.png")).Save("E:/PhantomTank.png");

Color picture demo:

PhantomTank.CombineColorful(new Bitmap("E:/Foreground.png"), new Bitmap("E:/Background.png")).Save("E:/ColorfulPhantomTank.png");

Stereogram

Naked eye 3D image

Using depth maps and textures to create naked-eye 3D images
Setting the fuzzy parameters
Support depth specification
Parallel eyes vs. crossed/crossed eyes
Demo Depth Map

Demo Texture

code:

Stereogram.MakeWithPattern(new Bitmap("E:/shark.png"), new Bitmap("E:/jellybeans2.jpg")).Save("E:/stereogram.png");

You can find more textures here

StringArtCipher

This feature is not yet complete

Sound

The encrypted result is sound

MorseMoonlight

Incorporating Morse code into the rhythm of the first movement of the Moonlight Sonata
If you want to be able to encode to Wav, you need to provide a soundfont file, edited in TIMIDITY.CFG

var morseCode = MorseCode.Standred.ToMorse("MorseMoonlight");
MorseMoonlight.ExportMidi(morseCode, "E:/MorseMoonlight.mid");
MorseMoonlight.ExportWav(morseCode, "E:/MorseMoonlight.wav");

MorseMoonlight.mid

Note: The length of the rhythm that can be encoded is limited

Undefined

SemaphorePathCipher

no key

Start from the upper left corner from left to right
Connect a letter according to the symbol corresponding to the flag
Delete all letters on the path
The rest is the content

StringArtCipher

Euler font using 22 pins
Non-Eulerian font using 22 pins

PascalianPuzzleCipher

Perform a specific transformation on the data

Footnotes

wikipedia/Josephus_problem ↩
wikipedia/Transposition_cipher#Scytale ↩
wikipedia/Rail_fence_cipher ↩
wikipedia/Transposition_cipher#Columnar_transposition ↩
wikipedia/Grille_(cryptography)#Turning_grilles ↩
wikipedia/Siamese_method ↩
wikipedia/Magic_square#doubly_even_order ↩
wikipedia/Strachey_method ↩
wikipedia/Arnold's_cat_map ↩
wikipedia/Baker's_map ↩
wikipedia/15_puzzle ↩
Chinese Commercial Code ↩
base100 ↩
base2048 ↩
base65536 ↩
base32768 ↩
wikipedia/Base32 ↩
wikipedia/Base85 ↩
braille-encode ↩
Bubble_Babble ↩
国家通用盲文方案 ↩
wikipedia/四角号码 ↩
wikipedia/注音符號 ↩
wikipedia/Quoted-printable ↩
Whole-Word Phonetic Distances and the PGPfone Alphabet ↩
wikipedia/Punycode ↩
esolangs/Ppencode ↩
wikipedia/Brainfuck ↩
erikdemaine/shuffle ↩
wikipedia/Cistercian_numerals ↩

Files

README_EN.md

Latest commit

History

README_EN.md

File metadata and controls

ClassicalCryptography

Transposition

ReverseCipher

TakeTranslateCipher

TriangleCipher

JosephusCipher

RailFenceCipher

OriginalRailFenceCipher

Transposition2D

CycleTranspose

AdvancedRailFenceCipher

RotatingGrillesCipher

MagicSquareCipher

HilbertCurveCipher

SpiralCurveCipher

ArnoldCatMapCipher

VBakersMapCipher

JigsawCipher

FifteenPuzzle

SixteenPuzzle

TwiddlePuzzle

Replacement

SingleReplacementCipher

MorseCode

CommercialCode

EnigmaMachine

Encoder

PLEncoding

Calculation

ShortHide5

RSASteganograph

PerfectShuffle

Image

PigpenCipher

ColorfulBarcode

MoirePattern

WeaveCipher

CisterciansNumerals30

Steganography

NotMosaic

PhantomTank

Stereogram

StringArtCipher

Sound

MorseMoonlight

Undefined

SemaphorePathCipher

StringArtCipher

PascalianPuzzleCipher

Footnotes

CisterciansNumerals³⁰