Newest 'hill-cipher' Questions

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What are some statisitcal characteristics of a hill cipher?

Given a ciphertext, after performing a frequency analysis on it, how would you identify it as a hill cipher? What should i expect to see in the statistics?

asked Sep 4 at 5:49

Darkmoomba

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Hill Cipher: Determining the number of bad keys

Find the number of matrices whose determinant is a multiple of 13 where the first column is not a multiple of 13 but the second column is a multiple of the first modulo 13. Here's what I have done: ...

encryption hill-cipher

asked Feb 6 at 5:59

m0bi5

1426 bronze badges

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vote

1answer

332 views

Hill cipher concepts

I have some questions about the Hill cipher. There is a rule for key K: Determinant of matrix and number of characters of the alphabet must be coprime. What does ...

encryption substitution-cipher hill-cipher

asked Nov 2 '20 at 11:36

Arth

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0

votes

1answer

350 views

Impossible hill cipher question

I've been trying to solve this question from Forouzan's book ("Cryptography And Network Security") and haven't been able to wrap my head around how to solve it. The plaintext “letusmeetnow” ...

hill-cipher

asked Oct 15 '20 at 12:13

Sambbhav Garg

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Hill cipher. Any way around the not invertible matrices [duplicate]

Question: The plaintext JULY is encrypted using Hill Cipher with m = 2, to give the ciphertext DELW, then determine the encryption and decryption matrix My approach: We will form a 2x2 matrix of ...

classical-cipher hill-cipher

asked Feb 29 '20 at 18:50

kkheelan

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55 views

Where can I find standardized implementations of lightweight cryptographic ciphers?

I am working on a project that requires encrypting messages with different ciphers. I am looking for the following ciphers: PRESENT, CLEFIA, LEA, Hill cipher, Affine cipher, Elliptic Curve ...

elliptic-curves lightweight affine-cipher hill-cipher present

asked Dec 17 '19 at 22:30

NotNotLogic

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2answers

266 views

Are there ready-to-use software that can try many decryption techniques on a ciphertext, with no information?

Let's say I receive a 1 MB encrypted file, but I get no information about the encryption method, and no password. The only thing I can guess is that the person probably used a weak encryption method ...

cryptanalysis rc4 vigenere hill-cipher

asked Oct 2 '19 at 21:51

Basj

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2

votes

1answer

524 views

Block cipher linearity (in relation to hill ciphers)

So while I knew hill ciphers were a form of block cipher (I'm assuming all the ones I have solved to date were ECB or something similar), so that got me thinking. Is it possible to use hill ciphers in ...

block-cipher cbc ctr hill-cipher

asked Sep 20 '19 at 8:22

Anan

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vote

1answer

358 views

Hill Cipher Plaintext Attack: Dealing with Non-uniqueness of Matrix Inverses?

I'm following along with my book. Here is an example of a plaintext attack from it: It is known that: plaintext = 'friday' ciphertext= 'pqcfku' $m$ = 2 We will use this to form the following matrix ...

modular-arithmetic matrix-multiplication hill-cipher

asked Aug 2 '19 at 0:22

user3724404

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1answer

252 views

Hill Cipher how to encrypt and decrypt when both "I" and "J" are in plaintext

In Hill Cipher, let's assume the key is "KEYWORD" and I want to encrypt "JUICE", so after encryption, I get "GXLBWU", and when decrypt ciphertext I get back "IUICEX" not "JUICE". So my questions are: ...

encryption hill-cipher

asked Jul 8 '19 at 11:28

Zeeshan Ali Qureshi

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vote

2answers

336 views

Hill Cipher with unequal matrix

How can we encrypt a text in Hill Cipher with a key matrix that is 3x3 when the plaintext is even like "ATTACKS"? Do we need to add padding like "x" or "z" to make the matrix equal? Thanks.

encryption hill-cipher

asked Jul 7 '19 at 7:00

Zeeshan Ali Qureshi

111 bronze badge

2

votes

1answer

1k views

Hill cipher: How to find an unknown key of unknown size

How would you tackle the problem of finding the key (you don't know the length) to a Hill cipher when knowing only one 12-letter word of plaintext and its corresponding ciphertext? CONVERSATION has ...

known-plaintext-attack hill-cipher

asked Jun 19 '19 at 10:59

Christo Todorov

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2answers

648 views

Hill cipher -- obtain matrix key [closed]

I have to solve Hill's cipher. I have only cipher text: CGQIYN and key: CFDG. I don't know how to decrypt it, because in all ...

hill-cipher

asked Apr 17 '19 at 18:23

hill123

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399 views

Hill Cipher if the length of the string is not divisible by the Key Dimensions

For a project, I want to encode the word "MEMBRANOPHONES" with the key "MULTITONE". I try spliting "MEMBRANOPHONES" into groups of 3, but then I get "MEM", "BRA", "NOP", "HON", leaving me with a 2 ...

hill-cipher

asked Apr 11 '19 at 15:01

PotatoLatte

1011 bronze badge

2

votes

0answers

448 views

How can I determine the Hill cipher key in this case?

I have been struggling with a Hill cipher problem for many days, without any luck. I have the following ciphertext, which I know is an encrypted excerpt from an Edgar Allan Poe story: ...

cryptanalysis block-cipher classical-cipher hill-cipher

asked Feb 10 '19 at 22:57

Ali Mustafa

1212 bronze badges

-1

votes

1answer

630 views

Problem while decrypting Hill cipher

I have a plaintext "monday" and ciphertext "IKTIWM" and $m=2$. I want to find the key of the Hill cipher. I made a matrix $$ \begin{bmatrix} a_1 & a_2 \\ a_3 & a_4 \end{bmatrix}\begin{...

encryption cryptanalysis matrix-multiplication hill-cipher

asked Feb 1 '19 at 11:04

Manoharsinh Rana

1616 bronze badges

3

votes

2answers

515 views

An unbreakable Hill cipher?

Why don't we use a Hill cipher of 100 × 100? Or even bigger? That would be close to unbreakable. The number of possible keys in a 2 × 2 Hill cipher is 157248. For 100 × 100 the number is beyond limits....

encryption cryptanalysis perfect-secrecy hill-cipher

asked Jan 31 '19 at 15:46

Manoharsinh Rana

1616 bronze badges

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vote

1answer

99 views

How does hill cipher key exchange takes place?

I am giving a presentation in my college where hill cipher is a part of the presentation. I just wanted to know, how is the hill cipher key matrix is exchanged securely in order to decrypt the message?...

key-exchange hill-cipher

asked Aug 16 '18 at 13:56

Srijan Singh

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vote

1answer

629 views

Clarification on Hill Cipher crib dragging technique

--- this has been edited as I realised the question was silly. replaced with helpful information --- I want to confirm the following: Given ciphertext "AGHTDIX... [cont.]" (C) and crib (a word ...

classical-cipher known-plaintext-attack hill-cipher

asked Mar 23 '18 at 1:25

user8339

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2answers

105 views

cofactor matrix in Hill cipher

I have been reading these slides about Hill cipher. And there it says that the value of K is the following: \begin{equation} K= \begin{pmatrix} 11&8\\3&7 \end{pmatrix} \end{equation} Now I ...

hill-cipher

asked Feb 13 '18 at 21:33

Layla

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1answer

8k views

Hill's Cipher - Known Plaintext Attack

I know this question has already been asked few times but I'm struggling a bit on a problem. I have a plaintext FRIDAY and its ciphertext PQCFKU, using $M = 2$, with corresponding integers $x = fr ...

modular-arithmetic known-plaintext-attack hill-cipher

asked Jan 22 '17 at 18:27

AndreaM16

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2answers

147 views

Hill-Chiffre - How can I find the Matrix $X$

This is a problem of classical cryptography: Hill-Chiffre Where the matrix $A$ is the clear message and the matrix $C$ the coded message. How can I find the Matrix $X$? Which method I can use? $$\...

modular-arithmetic linear-cryptanalysis hill-cipher

asked Oct 8 '16 at 20:58

Darío A. Gutiérrez

993 bronze badges

3

votes

1answer

609 views

Can Hill Cipher be considered as Asymmetric?

I know hill cipher is a block chipher ,We produce decryption key by inverse of key matirx but we still use different key for decryption. Therefore Can we say that Hill cipher is asymmetric chipher?

hill-cipher

asked Jun 2 '15 at 8:21

ccca

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Security of a custom non linear hill cipher

Initially let me state that this is an atypical type of cryptographic encoding. First I break up my key into three parts $k = {W,\overrightarrow{b},\alpha}$. the $W$ is simply a $n \times n$ matrix, $...

cryptanalysis hill-cipher

asked May 12 '15 at 5:46

Armen Aghajanyan

1113 bronze badges

0

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1answer

437 views

what is number of invertible matrix m*m on$ z_n$? [closed]

‎ ‎‎please help me what is number of invertible matrix $‎m*m$‎‎‎ on Group $\mathbb{z}_n$ ?‎‎‎, assuming we know‎ this number in $\mathbb{Z}_p \quad$ (‎p is prime‎‎) is $‎(p^{n}-1)(p^{n}-p) \cdots ...

hill-cipher

asked Apr 23 '15 at 10:55

roohi

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1answer

578 views

Hill Cipher the point of a known plaintext attack question

Is the point of a known plaintext attack on a Hill Cipher to get the matrix key?

hill-cipher

asked Feb 22 '15 at 18:07

Connor

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1answer

2k views

How to encrypt letters less than block n using Hill Cipher

I am learning about Hill Cipher and know that it is a block cipher where each block of n letters (considered as an $n$-component vector) is multiplied by an invertible $n \times n$ matrix, again ...

encryption reference-request padding hill-cipher

asked Oct 15 '14 at 0:59

Computernerd

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how to find key matrix in hill cipher

I want to solve this problem but there are 3 known plaintext-ciphertext pairs. The key of Hill cipher is a 3*3 matrix as k=[k1,k2,3; k4,k5,k6; k7,k8,k9] where the unknown ki={0,1,...25}={A,B,......

hill-cipher

asked Oct 8 '14 at 11:46

teardrop

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2

votes

1answer

536 views

Hill Cipher question

Recently, I was given three ciphers to crack for my cryptography class. At this point, I have guessed that one of them is likely a Hill cipher (probably 3x3, as that is the most complex we have done ...

cryptanalysis algorithm-design hill-cipher matrix-multiplication

asked Sep 3 '14 at 23:03

user17103

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votes

1answer

921 views

Security of the iterated Hill Cipher

I can understand that the basic Hill Cipher is susceptible to known plaintext attacks, but suppose the Hill Cipher is modified into the Iterated Hill Cipher. For a plaintext $x_0=m_0$ and an ...

encryption cryptanalysis symmetric hill-cipher

asked May 30 '14 at 9:54

user13794

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0answers

1k views

How can I decode a Hill Cipher without a key? [duplicate]

On my exam, we had to solve this problem: message matrix is: [20, 19, 14; 17, 0 10] and the ciphertext matrix is: ...

hill-cipher

asked Apr 24 '14 at 9:06

user13212

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vote

0answers

4k views

Hill cipher key space

Key space is the set of all possible keys that can be used to generate a key. We using the number of valid key to describe it. I've given a hill cipher of block size $k$ over alphabet of size $p$, ...

keys prime-numbers classical-cipher hill-cipher

asked Apr 9 '14 at 14:29

atom2ueki

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2

votes

1answer

7k views

Hill cipher cryptanalysis - known plaintext known key size

Hello I want to know how to go about this problem I know the plaintext "abcdef" and the ciphertext. The key size is 2. I really can't figure out how to find the key for decrypting and encrypting.

classical-cipher known-plaintext-attack key-size hill-cipher matrix-multiplication

asked Mar 7 '14 at 15:11

cryptonoob123

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2

votes

1answer

1k views

Hill cipher is not perfectly secure

I am on cryptography course and there is a homework question to show that Hill cipher doesn't have perfect security. So assume we have an cryptosystem $(P,C,K)$, where $P = C = \mathbb Z_{26}^N$ and $...

hill-cipher perfect-secrecy

asked Feb 4 '14 at 18:20

Valtteri

1235 bronze badges

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vote

2answers

486 views

hill cipher encryption way 1x3 plaintext matrix

Can someone help me with a Hill cipher? When do I have to use: 1x3 plain text matrix (p1, p2, p3) * 3x3 key matrix 3x3 key matrix * 3x1 plain text matrix Or they are both correct? I tried to ...

reference-request hill-cipher matrix-multiplication

asked Nov 21 '13 at 3:00

reem20

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1answer

570 views

Hill Cipher - Unknown plaintext attack, known key [duplicate]

I was wondering if I have the key and the encrypted Hill Cipher message(s). I can definitely figure out the charset involved. But the order is missing. Assuming that I use 37 modulo or higher. How ...

hill-cipher

asked Oct 14 '13 at 16:55

Omair .

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2answers

755 views

Are there any hand ciphers not obsoleted by computer cryptanalysis? [duplicate]

Computerized cryptanalysis has obviously made formerly "secure" hand ciphers like Playfair, Four Square, and the Hill Cipher obsolete because they can be defeated in seconds. But is there a hand ...

cryptanalysis encryption hill-cipher

asked May 18 '13 at 17:58

Luke Sheppard

1114 bronze badges

4

votes

1answer

1k views

Hill-cipher, disordered alphabet

I am going to apply a simple substitution cipher to my input, then encrypt the result with a Hill cipher. How can this be broken, in a chosen-plaintext threat model? In other words, instead of the ...

cryptanalysis classical-cipher hill-cipher

asked May 16 '13 at 9:27

user9

434 bronze badges

5

votes

2answers

2k views

Hill cipher, unknown letter value

I've been struggling on this problem for a while now : the Hill cipher is well-known to be vulnerable to known-plaintext attack due to its linearity. Given a key matrix $K$ of size $n\times n$, one ...

cryptanalysis known-plaintext-attack hill-cipher

asked Jan 2 '13 at 0:20

trispo

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4

votes

3answers

9k views

Hill Cipher known plaintext attack

I know a plaintext - ciphertext couple of length 6 for a hill cipher where its key is a [3x3] matrix. Based on what I've read and learned, to attack and crack keys of [n x n], if we know a plaintext -...

known-plaintext-attack hill-cipher

asked Oct 16 '12 at 15:32

ecem

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2answers

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Figuring out key in hill cipher (chosen-plaintext attack)

I have been wondering what approach to take in order to figure out what key was used to encrypt a message using the hill cipher. I know it is possible to obtain it even if it were just a known-...

keys chosen-plaintext-attack hill-cipher

asked Sep 26 '12 at 22:42

Emyr

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2

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1answer

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Calculating the inverse modularity of the determinant for Hill cipher

I'm trying to decrypt a message encrypted with Hill Cipher, but I don't understand how to find the determinant so it solves the equation $det * 1/det = 1 mod 26$. The determinant for my key matrix is ...

encryption hill-cipher

asked Sep 10 '12 at 14:37

maya-bf

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votes

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658 views

Security analysis of a "one-time pad" type hill cipher

Suppose the Hill cipher were modified to something like a one-time pad cipher, where Alice wants to send a message to Bob, and she chooses a key matrix randomly everytime a new message is sent (and ...

cryptanalysis provable-security hill-cipher

asked Mar 3 '12 at 18:10

user996522

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