How can decrypt the file that the program below encrypt?
// This program encrypts a file
#include<iostream>
#include<fstream>
using namespace std;
int main() {
const int ENCRYPT=10; // amount to add to a chor
const int SIZE= 255; // array size
[Code]...
private String[] GetExcelSheetNames(string excelFile) {
OleDbConnection objConn = null;
SqlConnection objSqlConn = null;
System.Data.DataTable dt = null;
try {
[code].....
Now I can fatch all the excel sheet belongs to the Excel File.But How can I check "If and Only If the sheets are havin Underscore in their name(eg. student_data,teachers_data) then only the data of the sheets will populate in tha data base"
I am starting a project in a few weeks that needs to be able to prevent an executable from running until it has been checked for various criteria (think of it as a DIY anti virus).
My main idea is to build a file filter driver in C to hook into file system reads and writes and prevent executables that I don't like from executing off the disk.
I have an application which needs to connect to a database. It runs in the background so there is no user input. I therefore need to store the connection string. I want to encrypt the connection details and then store the encrypted information. My thinking is I would read the encrypted details, from wherever I store them, unencrypt them and then connect to my database.
I've done a bit of reading on this and the SHA1CryptoServiceProvider method seems like an option but it appears that this cannot be unencrypted.
So how can I use this encrypted information?
Or is there another method?
I'm new to c# and i'm using vs 2013 and access database..my i need to do multiple update records after I filtered the records in datagridview
In my database table I have these fields ID(PK/autonumber), EID,Date,Day,Daystatus..
In my form I have a button and it's fucntion is filter by date using bidingsource.fiter and this was the result
EID------Date-----------Day---Daystatus
10175--10/11/2014---sat--------regular
10176--10/11/2014---sat--------regular
10177--10/11/2014---sat--------regular
10178--10/11/2014---sat--------regular
what I want to happen is when I click another button called "Apply to all" I want to Update all the daystatus to "Legal Holiday" of the filtered records..I know how to update one by one using simple update..but I need to do the multiple update..
I tried to make a code but it was updating all the records not the filtered only here's my code:
try {
OleDbCommand command = new OleDbCommand();
connection.Open();
command.Connection = connection;
string query = "SELECT EID From EmployeeTable";
command.CommandText = query;
String a = "Legal Holiday";
[Code] ......
I am trying to apply gabor filter to a fingerprint for fingerprint enhancement using c.
My image size is 280x340.Gabor filter equation is :
F(x,y) = exp(-0.5*[x^2/sigma_x^2 + y^2/sigma_y^2]) * cos(2*PI*f*x);
I am able to execute this equation.But my problem is i am calculating the equation for 280x340 times and it is taking time(4 sec 2.93GHz 3GB ram).
how to reduce the executation time ?
What I know exp function is taking time. So is there any equivalent of exp which will take less time to execute ?
I am to use this cipher in which the number x is encrypted
(a and c are known numbers)
Also, what will the decrypt function be? Actually, i need to find the decryption formula...below is the code i tried to test...
char x = 'a';
cout<<x1<<endl<<x2<<endl;
cout<<x1<<endl<<x2<<endl;
i have an executable that is encrypted; it is made in Visual C++. decrypt it? what i must to look for? I have some kind of files (.req extention) that have the content encoded by password type.
View 2 Replies View RelatedI'm trying to get some more user friendly things in my program done. Now I'm trying to filter by typing in a text box and it filters to what you are typing and shows the entire row.
This is what I currently have:
private void txtFilter_TextChanged(object sender, EventArgs e) {
try {
SQLiteConnection connect = new SQLiteConnection(connString);
connect.Open();
[Code] ....
I get an exception error though:
SQLite error
near "'N'": syntax error
// N is what I started typing to start the filter.
Ok, so I've edited the code now to this:
private void txtFilter_TextChanged(object sender, EventArgs e) // FILTER TODO {
DataView view = new DataView();
SQLiteConnection connect = new SQLiteConnection(connString);
connect.Open();
view.RowFilter = "Channel like '%" + txtFilter.Text + "%'";
}
No more exception errors, just not what I want it to do. It just keeps everything there.
I just want to test AES from openSSL with this 3 modes: with 128,192 and 256 key length but my decrypted text is different from my input and I dont know why. Also, when I pass a huge inputs length (lets say 1024 bytes) my program shows `core dumped`... My input is always the same but it doesnt matter, at least for now. Heres the code:
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <openssl/aes.h>
int main(int argc, char **argv){
[Code] .....
this program on how to make a encryption and decryption program of a txt file
#include "stdafx.h"
#include <iostream>
#include <string>
#include <fstream>
using namespace std;
[Code].....
How to perform RSA decryption with just the modulus and public exponent. I know that in RSA the private key does the decrypt, but thats not what I need to do. It is actually more of a verify used to recover information for the purposes of integrity (stupid I know) but its the problem I have to solve. Basically I need to do an RSA operation with the modulus and public key. When I try it I receive the error:
System.Security.Cryptography.CryptographicException: Key does not exist.
at System.Security.Cryptography.CryptographicException.ThrowCryptographicException(Int32 hr)
at System.Security.Cryptography.RSACryptoServiceProvider.DecryptKey(SafeKeyHandle pKeyContext, Byte[] pbEncryptedKey, Int32 cbEncryptedKey, Boolean fOAEP, ObjectHandleOnStack ohRetDecryptedKey)
at System.Security.Cryptography.RSACryptoServiceProvider.Decrypt(Byte[] rgb, Boolean fOAEP)
at IssuerPublicKeyRecoveryApp.Form1.PerformVerification() in C:devMarvinDevIssuerPublicKeyRecoveryAppIssuerPublicKeyRecoveryAppForm1.cs:line 543.
My Code is as follows:
try{
//Create a new instance of RSACryptoServiceProvider.
using (RSACryptoServiceProvider RSA = new RSACryptoServiceProvider()) {
//Build the RSA key parameters to perform decrypt
RSAParameters RSAKeyInfo = new RSAParameters();
[Code] ....
I have verified that my values are good on : [URL] ....
This example is strait off the MSDN website, and I realize it says that you need the private key information on the RSA import. For what I am doing, I do not have that, since I am doing a decrypt(not really). Since I know that the Math of an RSA operation is actually identical weather you are doing encrypt or decrypt, and it is just a convention of length for the exponent, I tried to do an Encrypt operation to decrypt the data, and the error checking caught that it was the wrong length in stead of performing the operation.
We need an AES Encryption/Decryption program in C for college lab (Educational) purpose . So we cannot use any "aes.h" file for this . We need a C program which simulate the purpose of AES
Input : Text (e.g: Anes P.A)
key (e.g:123op)
Output : Cipher Text using AES
I look this functionality done in a website : [URL] ....
Attached Images : AES.jpg (36.4 KB)
I need to decrypt my text file and make it able to read in my program..
What I have programmed so far is to read the encrypted file, create a new file, decrypt it and read the newly created file..
I need to decrypt the encrypted file without having to create a new file that reads the decrypted text..
Well, Let me show you my code:
P.S Most of the include is not needed and I already know that Visual studio 2010 Windows Form Application CLR
Code:
#pragma once
#include "stdafx.h"
#include <iostream>
#include <fstream>
#include <conio.h>
[Code].....
You have my decryption code and the code I want to use..
I have uploaded the code for you to use on your computer because it is fairly hard for me to explain..
I want to be able to read the encrypted file in my program, without having to writing a new file to decrypt it..
Decrypted & Encrypted .txt file Included (And images)
--> Program .rar pack link <--
Build it with Visual Studio 2010
I have been working on some C++ code that doesn't seem to be going right. I'm wanting it to read a (three-digit) integer representing the value to be encrypted, a (one-digit) integer representing the encryption key, encrypt the value and print the encrypted value. The encrypting method used is that each digit in the given number is replaced by ((the sum of that digit plus key) modulo 10) then the first and last “encrypted” digits are swapped.
For example, if the number entered was 216 and the key given was 7, after applying the encryption procedure described the first digit (2) would become 9, the middle digit (1) would become 8 and the last digit (6) would become 3. The first and last encrypted digits are then swapped. The program displays the encrypted number: that is 389 in this case.
#include <iostream>
using namespace std;
int main() {
int isolateDigits();
int replaceDigits();
int swapDigit1withDigit3();
[Code] ....
I am having trouble with an assignment. The assignment consists of a basic encryption and decryption program already written for me, I just have to write the encryption function. What we have to get the program to do is enter an integer and a text, and get the program to increment each letter in the text by the integer given. I did this by using a for loop and incrementing each value in the string by the integer.
However, I still can't get it to decrypt and I need the program to work with only a-z letters (if I increment each letter by 3 and I have the letter Z, it should go to Z+3 = C).
I attached the description of the attachment and below are the codes: The first file does not need to be edited.
Code:
/*******************Programming Assignment 1***************/
/****************Caesar's substitution cipher**************/
/*****************YOU MUST NOT EDIT THIS FILE**************/
/****Substitute alphabets in a string using rotation key***/
/****Leave all other characters unchanged******************/
/****Confirm correct encryption by decrypting**************/
[Code] ......
while(!in.eof()) {
in >> ch;
char d = int(ch) + 10;
out << d;
[Code] ....
The first while loop would be to encrypt it, and the second would decrypt it, the decrypting is not giving the original content. For example:
in = Hello
encrypt...
decrypt...
out = Hellooo
How to do encrypt and decrypt the text by using md5 algorithm without using the any library? Only implement in c++ program.
View 4 Replies View RelatedI need to be able to actually read my encrypted file..
I have the decryption code and works perfectly when running it through console app c++.
But, the way I decrypt is to decrypt from a file, and create a new file which is decrypted.
I can't use that kind of code in my program in windows form app c++..
I need to read the encrypted text file and decrypt it in memory while using it for my program..
Some links to my codes I use at the moment.
My decryption coded in console application: [URL] ....
My decryption code edited for form application (Did not do anything) [URL] ....
And this is the code I tried to read after it got decrypted (Reading file written in combobox_selectedindexchange: [URL] ....
For my purpose all I need to know is drive's BitLocker encryption status by its DOS path. Something like this:
Code:
enum DriveEncryptionStatus{
Unprotected,
Protected,
Unknown
};
DriveEncryptionStatus = GetDriveBitlockerEncryptionStatus(L"C:");
I was able to find the Win32_EncryptableVolume class that unfortunately comes with this caveat:
To use the Win32_EncryptableVolume methods, the following conditions must be met:
You must have administrator privileges.
How to do this without running as an administrator?
Write a program to do simple encryption and decryption. Encryption basically means to convert the message into unreadable form. In this assignment, it should be done by replacing each letter of a message with a different letter of the alphabet which is three positions further in the alphabet. Then, all the letters will be reversed. Decryption is the process of converting encrypted message back into its original message. Your program should use the following shifting method.
Note: You must use array.
#include <iostream>
#include <string>
using namespace std;
[Code].....
I have a huge text file in following format:
{Bunch of text
.
.
}
[Code].....
I want to extract Text1, Text2, Text3, Text4,..., Text600 in the output file. How can i achieve this?
/* BTW, I am not getting my homework done here. I am an ex-programmer, who has now moved to marketing for some time now, and today, I encountered this problem, which I believe can be solved easily through programming. */
I need to find inverse of a matrix data in binary file should be used to form matrix.its not finding inverse correctly rest is working good.
Code:
#include <stdio.h>
void createbin();
void display();
void inverse();
int main()
{
createbin();
display();
inverse();
[Code] ....
I am writing a program where I need to read a byte of char data and convert it into a text string of binary data that represents the hex value...
i.e. The char byte is 0x42 so I need a string that has 01000010 in it. I've written the following subroutine....
------------- My Subroutine ----------------------------------------------------------------------
void charbytetostring(char input, char *output){
int i, remainder;
char BASE=0x2;
int DIGITS=8;
char digitsArray[3] = "01";
[Code] ....
When I submitted the byte 0x42 to the subroutine, the subroutine returned to the output variable 01000010... Life is good.
The next byte that came in was 0x91. When I submit this to the subroutine I get garbage out.
I am using a debugger and stepped through the subroutine a line at a time. When I feed it 0x42 I get what I expect for all variables at all points in the execution.
When I submit 0x91 When the line remainder = input % BASE; gets executed the remainder variable gets set to 0xFFFF (I expected 1). Also, when the next line gets executed..
input = input / BASE; I get C9 where I expected to get 48.
My question is, are there data limits on what can be used with the mod (%) operator? Or am I doing something more fundamentally incorrect?
I have written the following code to add data to text files which are required to store 3D scan data (I have to calculate the y-coordinate). My code seems to work except that it stops working when I want to create more than ten text files i.e. the directory I am trying to store them in will not hold any more than ten text files. Code is shown below.
#include <string>
#include <locale>
#include <iomanip>
#include <iostream>
#include <fstream>
#include <sstream>
using namespace std;
[Code] ....
I want to input data into text file while not deleting the original data in the file and I use something as
ofstream writefile;
writefile.open("example1.txt");
if (writefile.is_open()) {
for(j=0; j<N; j++) {
[Code] ....
But this will delete the original data.
