# Ciphertext program java client server jobs

Develop a tool to automatically cryptanalyze English **ciphertext** produced by the substitution cipher studied

Need some one that can get the **cipherText** and 60% of plain text do determine which crypto algorithm was used also the encryption KEY.

Implement a trapdoor knapsack encryption scheme. When the **program** is run, it ﬁrst asks for the size of the super-increasing knapsack, then the user is asked to enter the value of each ai in the private key. Then, the user is asked to enter a modulus, follows by a multiplier.
You will need to check whether condition of the multipllier is satisﬁed

...implement a simplified version of the TLS/SSL protocol in this assignment. Write (**Java** or C/C++)
UDP programs allowing two parties to mutually authenticate each other and establish a secure communication
channel. For simplicity, let us call the programs “Host” and “**Client**”, which are executed by Alice and Bob,
respectively.
Alice and Bob share a common

...(s ^ r) mod p
- s is the secret (an integer) to be encrypted using above formula
- r is a random 500-bit number
- p is a random 500-bit prime number
- c is the **ciphertext** computed using this formula
Above design is vulnerable, because attacker can calculate the value of s if he/she got enough pairs of <c, p> values.
There are 3 tasks:

...(s ^ r) mod p
- s is the secret (an integer) to be encrypted using above formula
- r is a random 500-bit number
- p is a random 500-bit prime number
- c is the **ciphertext** computed using this formula
Above design is vulnerable, because attacker can calculate the value of s if he/she got enough pairs of <c, p> values.
There are 3 tasks:

...txt that has FIVE lines in it:
- first 40 characters of the plaintext message of the first **ciphertext**
- key used to encrypt the first **ciphertext**
- first 40 characters of the plaintext message of the second **ciphertext**
- key used to encrypt the second **ciphertext**
- one line description of how you solved it.
-------------------------------------

...txt that has FIVE lines in it:
- first 40 characters of the plaintext message of the first **ciphertext**
- key used to encrypt the first **ciphertext**
- first 40 characters of the plaintext message of the second **ciphertext**
- key used to encrypt the second **ciphertext**
- one line description of how you solved it.
-------------------------------------

...c = (s ^ r) mod p
- s is the secret (an integer) to be encrypted using above formula
- r is a random 500-bit number
- p is a random 500-bit prime number
- c is the **ciphertext** computed using this formula
Above design is vulnerable, because attacker can calculate the value of s if he/she got enough pairs of <c, p> values.
There are 3 tasks:

...txt that has FIVE lines in it:
- first 40 characters of the plaintext message of the first **ciphertext**
- key used to encrypt the first **ciphertext**
- first 40 characters of the plaintext message of the second **ciphertext**
- key used to encrypt the second **ciphertext**
- one line description of how you solved it.
-------------------------------------

...used to encrypt the string “Hello world”
in each of the files that belong to your group. For simplicity, each **ciphertext** is divided
in two files: keysize X bits group [login to view URL], and keysize X bits group Y.iv. The former
contains the **ciphertext**, and the latter the initialization vector. You only need to work on
files associated with your group. You can

...decrypt it and save both plaintext and **ciphertext** to the output file or create new text file if no file path was provided.
ii. Measure the time taken for both encryption and decryption.
iii. Each method core method should have a time measure.
• Output:
i. Time complexity report.
ii. Plaintext and **ciphertext**
2. The parallel Implementation

...used to encrypt the string “Hello world”
in each of the files that belong to your group. For simplicity, each **ciphertext** is divided
in two files: keysize X bits group [login to view URL], and keysize X bits group Y.iv. The former
contains the **ciphertext**, and the latter the initialization vector. You only need to work on
files associated with your group. You can

...developed for Windows . Create a **program** to encrypt and decrypt binary files using S-DES (Simplified DES) in the Cipher Block Chaining mode. The **program** takes the input of an initial key and an initial vector, reads the plaintext or **ciphertext** from a file, conducts the encryption or decryption, and writes the resulting **ciphertext** or plaintext into a second

... a **program** to encrypt and decrypt binary files using S-DES (Simplified DES) in the Cipher Block Chaining mode. The **program** takes the input of an initial key and an initial vector, reads the plaintext or **ciphertext** from a file, conducts the encryption or decryption, and writes the resulting **ciphertext** or

...decrypt it and save both plaintext and **ciphertext** to the output file or create new text file if no file path was provided.
ii. Measure the time taken for both encryption and decryption.
iii. Each method core method should have a time measure.
• Output:
i. Time complexity report.
ii. Plaintext and **ciphertext**
2. The parallel Implementation

An Efficient Privacy-Preserving Ranked Keyword Search Method. Cloud data owners prefer to outsource documents in an encrypted form for the purpos...Method. Cloud data owners prefer to outsource documents in an encrypted form for the purpose of privacy preserving. Therefore it is essential to develop efficient and reliable **ciphertext** search techniques.

...and check if plaintext is well formed under padding (yes or no).
3. Repeat step 1. This time, launch the padding oracle attack (PKCS#7) to gain plaintext (attacker knows **ciphertext**, IV, and length of plaintext, try to find plaintext)
I will send you more detailed instruction. Most information are same. Give necessary comments in the code. One day

...text ﬁle containing the target **ciphertext** (given as command-line argument), it should print the encryption key and the decrypted plaintext without any user interaction. Test your code on the following ciphertexts, and answer these questions:
(a) What is the key of the cipher?
(b) What is the decrypted plaintext?
**Ciphertext** 1 (shift cipher) ODKBFAXAS

...writing a **program** that implements cipher.
"Choose a substitution cipher and call it CIPHER. Write a C (or any common language) **program** that implements your CIPHER. Write a C (or any common language) **program** CRACKER that uses the letter frequency count method to decrypt the **ciphertext** generated by your CIPHER. CRACKER should take as input a **ciphertext** ctex...

...cipher and call it CIPHER. Write a C (or any common language) **program** that implements your CIPHER. Write a C (or any common language) **program** CRACKER that uses the letter frequency count method to decrypt the **ciphertext** generated by your CIPHER. CRACKER should take as input a **ciphertext** ctext generated by CIPHER and return a "decrypted" form of ctext

...this assignment you'll write a **program** that encrypts the alphabetic letters in a file using the Hill cipher where the Hill matrix can be any size from 2 x 2 up to 9 x 9. Your **program** will take two command line parameters containing the names of the file storing the encryption key and the file to be encrypted. The **program** must generate output to the console

...and decrypt
messages shared between each other.
– Each message during Internet transmission must
be encrypted using a 56-bit key.
You can use any computer language (**Java**,
C++, Python) and leverage any existing opensource
software, tools, or commands (e.g.,
md5sum, sha1sum) to design the system.
Design Issues
• With a 56-bit key, what

Video steganography using **Java**. The message will first need to encrypted using RC4 and then the **ciphertext** will be embed into a ".flv" video . The **ciphertext** is then need to be able to extract it from the video and decrypt it using RC4. User should be able to enter the plaintext and key to encrypt and decrypt

...plain text supplied by the attacker but would not disclose the secret key it uses to encrypt the plain text. In such scenario, one could ask whether, given enough plaintext-**ciphertext**, pairs, the attacker could figure out the secret key or not. The following two problems will assume certain oracles that can perform certain tasks when queried, and the goal

TripleSDES
The DES algorithm uses keys of length 56 bits, which, when DES was originally designed, was thought to be secure enough to meet most needs. However,...TripleSDES encryption.
public static byte[] Encrypt( byte[] rawkey1, byte[] rawkey2, byte[] plaintext )
public static byte[] Decrypt( byte[] rawkey1, byte[] rawkey2, byte[] **ciphertext** )

Video steganography using **Java**. The message will first need to encrypted using RC4 and then the **ciphertext** will be embed into a ".flv" video . The **ciphertext** is then need to be able to extract it from the video and decrypt it using RC4. User should be able to enter the plaintext and key to encrypt and decrypt.

Video steganography using **Java**. The message will first need to encrypted using RC4 and then the **ciphertext** will be embed into a ".flv" video . The **ciphertext** is then need to be able to extract it from the video and decrypt it using RC4. User should be able to enter the plaintext and key to encrypt and decrypt.

Video steganography using **Java**. The message will first need to encrypted using RC4 and then the **ciphertext** will be embed into a ".flv" video . The **ciphertext** is then need to be able to extract it from the video and decrypt it using RC4. User should be able to enter the plaintext and key to encrypt and decrypt.

In this project, you will develop a C++ **program** to find keys of two files encrypted with AES in ECB mode using brute force key search (exhaustive key search). You will implement the Brute-force Key Search, i.e., you should try all the different combinations of first four bytes of the keys to find the right key (The first 4 bytes of the key are in the

...this assignment you'll write a **program** that encrypts the alphabetic letters in a file using the Hill cipher where the Hill matrix can be any size from 2 x 2 up to 9 x 9. Your **program** will take two command line parameters containing the names of the file storing the encryption key and the file to be encrypted. The **program** must generate output to the console

...and then we should write C (or any common language) **program** that implements your CIPHER. afterthat we need to Write a C (or any common language) **program** CRACKER that uses the letter frequency count method to decrypt the **ciphertext** generated by your CIPHER. CRACKER should take as input a **ciphertext** ctext generated by CIPHER and return a "decrypted" form

Encryption Decryption **program**
Write a **program** in any language you wish that accepts plaintext, a password (either through prompting the user or on the command line), and whether to encrypt or decrypt. Your **program** should, if available, use AES with a 128 bit key (derived from the password) in ECB mode to either encrypt or decrypt the plaintext given

This is an assignment that ...This isn't a difficult project. the objectives are
- Secret-key cryptography concepts.
- Using/writing programs to encrypt and decrypt different messages (plaintext/**ciphertext**)
- Encryption/decryption algorithms
- Encryption modes
- Encryption paddings
- Initial vectors (IV)
this will be using virtual machine.

...should be look like as below :
For encrypt with HILL CIPHER
ENTER PLAINTEXT : HELLO WORLD
ENTER KEY TO ENCRYPT : SASH
**CIPHERTEXT** : HGWEAWDSAA
TO DECRYPT, THE OUTPUT SHOULD BE LIKE BELOW
ENTER **CIPHERTEXT** TO DECRYPT : HGWEAWDSAA
ENTER KEY : SASH
PLAIN TEXT : HELLO WORLD
There should be three script file to be prepared
1.

What is the plain text for the following **ciphertext**, which was encrypted using a simple substitution
cipher cjbt coz npon zjv fttk twrtuyfgt nj dtn o xjl, y coz zjv cpjvik dtn o xjl myucn

I need a matlab code for blowfish algorithm encryption with text file that I can write into it the plaintext to finally get the **ciphertext**

...be able to parse it and get the items I need. The **program** shall unencrypt the “h2bypOe0AoHFu7mVYuTK5A “ utilizing:
public string Decrypt(string **cipherText**)
{
int KeyID = 1;
string EncryptionKey = getKey(KeyID);
byte[] cipherBytes = [login to view URL](**cipherText**);
using (Aes encryptor = [login to view URL]())

**Java** **program** AES-128 bits
Specifications:
you are required to write the **java** **program** “[login to view URL]” to implement the block cipher AES-128.
Specifically, your **program** will read parameters, key, plaintext and **ciphertext** from a file named “[login to view URL]” (under the same directory of the **program**). Then your...

...decrypt an L-symbol challenge **ciphertext** computed using a permutation cipher. Informally speaking, your program's goal is to find the plaintext used to compute this **ciphertext** within a reasonable amount of time. Specifically, your **program** should print on screen something like "Enter the **ciphertext**:", obtain the **ciphertext** from stdin, apply some ...

I want to decrypt the **ciphertext** to plain text. I want it to be solved using the PYCIPHER library. The algorithm that it is encrypted in is Ceaser Cipher and Columnar Transposition
Here are some suggestions to solve it:
Part I:
Implement a code that enumerates (in a list) all possible permutations of decrypted message. Note that this list does

...Unicode stream cipher that consists of both encryption and decryption algorithms. The encryption **program** accepts inputs from an existing text file, called “letter.txt.” The encryption **program** produces an output **ciphertext** file, called “secret” The decryption **program** takes “secret” as input and decrypts it into a plaintext, called &...

...consists of both encryption and decryption algorithms.
The encryption **program** accepts inputs from an existing text file, called “letter.txt.” This can have anything in it.
The encryption **program** produces an output **ciphertext** file, called “secret” The decryption **program** takes “secret” as input and decrypts it into a plaintex...

...stream cipher that consists of both
encryption and decryption algorithms. The encryption **program** accepts inputs from an existing
text file, called “letter.txt.” The encryption **program** produces an output **ciphertext** file, called
“secret” The decryption **program** takes “secret” as input and decrypts it into a plaintext, called
...

...CIPHER (30 points)
Choose a substitution cipher and call it CIPHER. Write a C **program** that implements your CIPHER. Write a C **program** CRACKER that uses the letter frequency count method to decrypt the **ciphertext** generated by your CIPHER. CRACKER should take as input a **ciphertext** ctext generated by CIPHER and return a "decrypted" form of ctext. The decrypti...

We need generate an algorithm that allow us obtain anyone of the 3 values (plaintext, **ciphertext** or key) with the other two values. BUT:
-The plaintext is an ascii
-The **ciphertext** always is a base64 (one line)
-The key is no more than 24 bytes.
We don't need a hard encoding, the goal is a short key.
Attached you can find an html that explain

...mcrypt_encrypt() in /var/www/vhosts/[login to view URL] on line 70" while reading response header from upstream, **client**: [login to view URL], **server**: [login to view URL], request: "GET /[login to view URL] HTTP/1.1", upstream: "fastcgi://unix:///var/www/vhosts/system/[login to view URL]:",

keystream xor-ed with the plaintext gives the **ciphertext** (encryption)

Using **Java** Cryptographic Architecture (JCA) and **Java** Cryptographic Extensions (JCE) implement the following protocol. Please refer to the lecture slides and online tutorials for completing this assignment. You may also find the following tutorial useful. [login to view URL]
1) Two entitles (Alice