How to make a txt file which is in english to be viewed in different way that cannot be understand by viewers but code should be able to read it the way it is written in english ?

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How to encrypt a file which can be read only through code of any program? I have a text file which i have use it such a way that users should not open and see inside that or change or view it. but it should be viewed or read only via code?

is there any way to do this?

when i compile the .cpp file is made as .obj file when this .obj file is opened by notepad its in some encrypted(not understandable)format.similarly how can i make .txt .obj form which when tried to view should be encrypted as .obj file.

Posted 19-Mar-12 20:22pm

chaiein

Updated 21-Mar-12 0:14am

v7

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Jochen Arndt 21-Mar-12 5:59am

You have changed the original question in such a way that solution 1 makes no more sense. You should at least let the original question in place to let others follow the thread without being confused.

Your updated question makes no sense. OBJ files are well documented but are not intended to store some kind of encrypted plain text.

chaiein 21-Mar-12 6:16am

now i updated with previous question. so is there any other way to make others not to look inside the .txt file or change?

Resmi Anna 21-Mar-12 6:36am

It is possible with normal c++ file read/write operations. for example suppose the content of your text file is "This is my file". here you can replace
'T' with '0'
'h' with 'x'
'i' with '!
's' with '@'

so that your file may look like "0x!@ i@..."
you can use your own logic to do this. What i said is just an example

chaiein 21-Mar-12 7:11am

Thank you all :)for the solutions. i solved as below solution 3

3 solutions

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When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
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Resmi Anna · Accepted Answer · 2012-03-19T20:37:00

Solution 1

http://msdn.microsoft.com/en-us/library/Aa382358[^]

hope this would help

Posted 19-Mar-12 20:37pm

Resmi Anna

Comments

chaiein 20-Mar-12 2:44am

Thank you:)

chaiein 20-Mar-12 2:52am

Actually i meant encrypting which is english only but when viewed should be in the format which user should not be able to read or understand. but the code should be able to read all that like a txt
file.

enhzflep 20-Mar-12 3:10am

Well, why not asciiHex(or something more compact) encode the encrypted data?

Just encrypt your text file to a memory buffer then output the hexValue of each character in the encrypted stream.

I.e
char str[] = {0,1,16,10,255,0};
char *str2 = asciiHex(str);

After above call, str2 should look like this: "00 01 10 0A FF"

Chandrasekharan P 20-Mar-12 4:57am

I would anytime go for asciiHex.

enhzflep 20-Mar-12 5:01am

Depends on what it's going to be used for.
AsciiHex representation takes up 100% more storage space.
Ascii85 representation takes up ~25% more space

You could LZW then ascii85 to get an input that was both
(a) smaller and
(b) unreadable

chaiein 20-Mar-12 3:20am

that sounds help full how to get back to normal characters

enhzflep 20-Mar-12 4:10am

Easy!

printf turns characters into an ascii representation of their hex value like so:

printf("This is 255 in hex: %02X\n", 255);
-This is 255 in hex: FF-

scanf will work in the reverse way.

I.e
scanf("00 01 10 0A FF", "%02X %02X %02X %02X %02X", &b1, &b2, &b3, &b4, &b5);
should leave you with (b1-b5 are all ints)
b1 = 0
b2 = 1
b3 = 16
b4 = 10
b5 = 255

Just remember you'll have to put in code to handle any whitespace you insert into the string (i.e the spaces between individual hex numbers)
Perhaps you'd find strtok advantageous here?

chaiein 21-Mar-12 4:30am

when i compile the .cpp file is made as .obj file when this .obj file is opened its in some encrypted(not understandable)format.similarly how can i make .txt .obj form which when tried to view should be encrypted as .obj file

chaiein 21-Mar-12 5:46am

if i use hexadecimal its easily converted by any one is there any way that i should not allow any one to modify read the contents in text file other than the code that uses it.

Jochen Arndt · Accepted Answer · 2012-03-21T00:24:00

A very simple solution:

C++

void Encrypt(LPCTSTR lpszFile, const BYTE *pBuf, unsigned nSize)
{
    LPBYTE pEnc = new BYTE[nSize];
    memcpy(pEnc, pBuf, nSize);
    for (unsigned i = 0; i < nSize; i++)
        pEnc[i] ^= 0xAA;
    CFile file;
    file.Open(lpszFile, CFile::modeCreate | CFile::modeWrite | CFile::typeBinary);
    file.Write(pEnc, nSize);
    file.Close();
    delete [] pEnc;
}
LPBYTE Decrypt(LPCTSTR lpszFile, unsigned& nSize)
{
    CFile file;
    file.Open(lpszFile, CFile::modeRead | CFile::typeBinary);
    nSize = file.GetLength();
    LPBYTE pBuf = new BYTE[nSize];
    file.Read(pBuf, nSize);
    file.Close();
    for (unsigned i = 0; i < nSize; i++)
        pBuf[i] ^= 0xAA;
    // Calling function must delete pBuf!
    return pBuf;
}
// UPDATE: Added these functions:
void EncryptFile(LPCTSTR lpszInFile, LPCTSTR lpszOutFile)
{
    CFile file;
    file.Open(lpszInFile, CFile::modeRead | CFile::typeBinary);
    nSize = file.GetLength();
    LPBYTE pBuf = new BYTE[nSize];
    file.Read(pBuf, nSize);
    file.Close();
    Encrypt(lpszOutFile, pBuf, nSize);
    delete [] pBuf;
}
void DecryptFile(LPCTSTR lpszInFile, LPCTSTR lpszOutFile)
{
    unsigned nSize = 0;
    LPBYTE pBuf = Decrypt(lpzsInFile, nSize);
    CFile file;
    file.Open(lpszOutFile, CFile::modeCreate | CFile::modeWrite | CFile::typeBinary);
    file.Write(pBuf, nSize);
    file.Close();
    delete [] pBuf;
}

You may replace the loop using XOR for encryption and decryption by any other method.

CPallini · Accepted Answer · 2012-03-21T00:05:00

Solution 2

An object file is compiled, not encrypted.
On the other hand you need a way to actually encrypt your plain text file.
While Resmi Anna's proposed link is good, you may also consider using a freely available encryption tool ( Google[^] is you friend).

Posted 21-Mar-12 0:05am

CPallini

Comments

chaiein 21-Mar-12 6:24am

but its little confusing for me.
When i have a text file with my required content encrypt once via code.then decrypt any number of times when ever using the text file? am i right?

CPallini 21-Mar-12 6:31am

When you have the encrypted file then you have to decrypt it to get back the original content. Once you have the original content, well..., you have it.

How to make a txt file which is in english to be viewed in different way that cannot be understand by viewers but code should be able to read it the way it is written in english ?

3 solutions

Solution 1

Solution 3

Solution 2

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