Encrypt And Decrypt Text File?


I save data from datagridview to text file . I also load the same data from text file into datagridview for edit and update the same thing to text file. Now i want to make my Drill layer header.txt in encrypted format to prevent anyone to open that file and modify out of program. They only can modify it through the program How can we do like this? My Drill Layer Header.txt file is like this T240C3.175F012S27H2000 T239C0.95F034S55H1000 T236C1.2F029S48H2000 [code].... This code can encryp the text file. But accrding to this code EncryptFile("c:\Drill Layer Header.txt", _ "c:\Drill Layer Header original1.txt", _ sSecretKey) It ask for input and output file. So it take data from Drill Layer Header then encrypt the save in drill layer header original.txt. I want it to take data from drill layer header and encrypt and save in same file.

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HiI have below code in one of the old program which encrypts the text. I need to decrypt the text which is encrypted using the below code. Is it possible?Code:Function Encrypt(sText As String) As Double    Dim nText As Double, i As Integer    nText = 0    For i = 1 To Len(sText)        nText = nText + Asc(Mid(sText, i, 1)) * 2 ^ i    Next    Encrypt = (nText * 2) + 18End Function Edited by - NeedHelp on 10/23/2005 8:58:18 AM

XML Encryption/Decryption In Separate Files? stackoverflow.com

I need to encrypt an XML file, send it to another location and decrypt it there. As you can see from the codes below, I am using the same key but it won't work (for now im simply using two local files). The error I get is as follows: Padding is invalid and cannot be removed.on this line in Decrypt.aspx: Dim xReader As XmlTextReader I am thinking it might be at the actual encryption stage causing errors e.g., file not saving correctly. Encrypt.aspx Dim rijnAlg As RijndaelManaged rijnAlg = RijndaelManaged.Create() [code]......

Encrypted File phpbuilder.com

what i need to do is create a text file on my webserver above root. once it is created i need to encrypt it with RSA or some other type of strong encryption. Once the file is encrypted i need php to pass the decryption key to the file and decrypt it and then open it up and read the contents of the file. Does anyone have any idea how to do this? i have searched high and low.

Unpredictable Encrypt And Decrypt www.phpfreaks.com

I am wondering if anyone has experienced an error encrypting and decrypting in and out of mysql. Sometimes when I decrypt then send an email to with the decrypted string it will still be encrypted. The strange thing is, this is unconsistant. Usually it will be fine, but other times it will keep something encrypted. All the values I am entering are numeric. I am however not currently checking for that.

Encryption Libraries ? www.xtremevbtalk.com

Hi,I want to use any Visual Basic Encryption Library with myprogram to Encrypt/Decrypt files.I have heard that DLL files for various Encryption Algorithmslike BLOWFISH, RIJNDAEL, DES, CAST etc..are available FREE for personal use.Suppose I use any DLL file with my program to Encrypt/Decryptfile(s), then is it possible for any hacker that he can stealthe DLL file and my file which contains Encrypted data, and Decompile the DLL file to decode the Encrypted file data?Please suggest some good places from where I can get thelibraries (VB version) and help about how to call them fromwithin my program.Thanks.

Text File Encryption www.vbforums.com

Hi to all,I am like 99% of those people on here in the way i would like to code the following....I have a series of textboxes on a form i would like to save the contents of these to a textfile but encrypt them prior save. Then, when reloading them decrypt the textfile and show the info back into their respective textboxes.Does anyone out there have a snippet of code to encrypt and decrypt text to a textfile?I would really appreciate this as i have a project to finnish for my Finance Director.

File Encryption www.xtremevbtalk.com

HI allI have a problem. I've got a file that keeps the score for a game called Columns.The problem is that i want to decrypt the file and then encrypt it again so that the game can read the scores again without losing any of the scores.The file is encrypted but the text is still normal.Can any body send me in the right direction or know of any tutorials about encryption.ThanxNewby1

Converting String To Bytes And Viceversa? www.dreamincode.net

Ive 2 buttons and 3 text boxes.Button 1 encrypts the data from textbox1 to bytes, converts it to string and display it in textbox2.Button 2 reads string from textbox2, converts it to bytes and decrypts it displaying it in textbox3 (textbox1 and 3 got to match).The encrypt/decrypt process works fine but the conversion from string to bytes is failing and cannot seem to find the problem. The error states that the string doesnt have the same format (Bytes(i) = Byte.Parse(Values(i)) [Code]...

Im Getting Crazy! Password Protect System With Encryption www.vbforums.com

Hi.The really strange thing is that this works fine in my PC, and worked fine when i tested it in a 2nd PC, but then i tested again in a 3rd PC and there its not working. I protect my program this way:When my program first install on the user PC it look for a file in windows/system, if its not there, the program look for HD serial number, then do serialn/60 and then shows it to user.The user must then enter the key word and the key number, he gets this by calling or sending mail to me. when he calls i ask for the number the program gives him (his HD serial number / 60),then I encrypt that number, and I do some math calculations.The encrypted number is the key word i give him, and the calculations is the key number i give him too.then he enters that value in 2 textboxes and press ACTIVATE, and then:the program DECRYPTS the encrypted key word and compares the result with user HD serial / 60.Then, make the same calculations i did, and compare the result with the key number the user inputs. If these 2 comparations are OK then the program ACTIVATES, el se give 2 more chances and then CLOSE.I Know the Encrypt module and the "Get HD serial number" module are working fine, but something is not working. Some times the function that returns the HD serial returns a negative number (in some computers) i solve this multiplying by (-1) when that number is minor than 0; I have to do it cause i use logarithm and Sqr.Well, here is the code:Code:private sub form_load()'module2.see is a function that returns the serial 'number of HD, works OKtext1.Text = Int((Module2.see) / 60) end sub'this function is not present in the user program 'because there is not need to encrypt therePublic Sub Encrypt() Dim loj As Long Dim cipherTest As New CIPHER cipherTest.KeyString = strKey cipherTest.Text = plaintext.Text cipherTest.DoXor cipherTest.Stretch encryptedtext.Text = cipherTest.TextEnd SubPublic Function Decrypt() As String Dim cipherTest As New CIPHER cipherTest.KeyString = strKey cipherTest.Text = text2.Text 'Here is the text that user inputs (encrypted) cipherTest.Shrink cipherTest.DoXor Decrypt = cipherTest.Text 'Here is the text decrypted 'It returns As LONGEnd FunctionPrivate sub ACTIVATE_PROGRAM()Dim lk As StringDim loj As LongDim k As LongDim n As Long 'Here user's machine decrypts the encrypted text i gave him: lk = Int(Val(Decrypt)) 'And here it looks for HD serial number and make some 'math changes to it: k = Module2.see / 60 If k < 0 Then n = k * (-1) Else n = k loj = Sqr(n ^ (0.5)) + (n / 5) * 3 loj = loj + ((n * 8) ^ (1 / 3)) + Sqr(n) loj = loj + Log(n / 2) * 5 + (n / 5)'Then, here, it compares lk with HD serial/60, and 'compares loj value with the number i gave himIf (lk = Int(Module2.see / 60)) And (text2.Text = loj) Then 'ACTIVATE MY PROGRAM HERE ElseUnload me 'Exitsend ifEnd Sub Well, thats all. Remember its working fine in 2 PC's, and not in another, that's what i cant understand. I tryed doing MSGBOX so the unregistered program would show me the passwords that should ACTIVATE it, and then i saw that passwords are OK!! 'Should I post the encryption and get serial modules?i can do it, but they are a little big, and i dont think the problem is there. I'll do it if necessary.thanks!JCI

Encrypt And Decrypt Video Streaming Using Algorithm VEA? stackoverflow.com

i want to encrypt and decrypt video streaming using algorithm VEA in JSP.here is algorithm VEA to encrypt and decrypt : Algoritma VEA( int m,/*key length*/ bit key[m], /*secret key*/ char *flv_video, /*input file*/ char *vea_flv_video) /*output file*/ [code]....

Security :: Encryption/Decryption With CAPICOM? forums.asp.net

I am trying to encrypt/decrypt a file with CAPICOM in javascript. I have to encrypt file with private key and decrypt with public key. But I dont know how to do this with CAPICOM.

Self Decrypting Email Attachment? www.xtremevbtalk.com

I downloaded AxCrypt and encrypted a pdf file. It creates an executable that self decrypts the file if the correct password is entered. This is what I need except that I have to email this self decrypting file - and we all know that exe files get blocked. Are there any self decrypting methods out there that do not use an executable file?

ActionScript 3.0 :: Play FLVs In Sequence Without A Gap Between? www.actionscript.org

I have single FLV file which is quite big. I want to encrypt it and decrypt but it takes too long. My best idea was to split video into smaller videos using third party software and apply my encrypting and decrypting functions to each one separately. Unfortunately I have a problem with gaps between loaded FLV files. Video has to be smooth without any pauses.

To Convert Textbox String To Byte Array forums.aspfree.com

in the below code i need to get get the encoded value from textbox and need to convert it to byte array and then decrypt.. how can i do that Dim xmlKeys As String 'A combination of both the public and 'private keys Dim xmlPublicKey As String 'The public key only 'The plaintext message in a byte array Dim PlainTextBArray As Byte () 'The cyphertext message in a byte array Dim CypherTextBArray As Byte ()<LI>In the Form_Load event, create both the public and private keys: Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load 'This creates both the public and the private keys Dim rsa As New RSACryptoServiceProvider 'Hold both keys in a global variable that will be used in the 'decryption procedure xmlKeys = rsa.ToXmlString(True) 'Hold the public key to be used in the encryption procedure xmlPublicKey = rsa.ToXmlString(False) End Sub<LI>Type in the procedures that encrypt and decrypt, respectively: Private Sub encrypt() Dim rsa As New RSACryptoServiceProvider 'get the public key so you can encrypt the message: rsa.FromXmlString(xmlPublicKey) 'get the message Dim message As String = TextBox1.Text If message.Length > 58 Then MsgBox("You must use fewer than 59 characters") : Exit Sub 'transform message string into a byte array: PlainTextBArray = (New UnicodeEncoding).GetBytes(message) ' Encrypt CypherTextBArray = rsa.Encrypt(PlainTextBArray, False) 'view the cyphertext in TextBox2: TextBox2.Clear() For i As Integer = 0 To CypherTextBArray.Length - 1 TextBox2.Text &= Chr(CypherTextBArray(i)) Next i 'see the lengths of the plaintext, and the cyphertext Me.Text = "Plaintext Length (Unicode): " & PlainTextBArray.Length & " Cyphertext Length: " & CypherTextBArray.Length End Sub Private Sub decrypt() Dim rsa As New RSACryptoServiceProvider 'get the keys, thereby creating an RSA object that's identical ' to the one used in the Form_Load event when the keys were first built rsa.FromXmlString(xmlKeys) 'create a byte array and then put the decrypted plaintext into it Dim RestoredPlainText As Byte () = rsa.Decrypt(CypherTextBArray, False) 'Step through the two-byte unicode plaintext, displaying the restored 'plaintext message For i As Integer = 0 To (RestoredPlainText.Length - 1) Step 2 TextBox3.Text &= Chr(RestoredPlainText(i)) Next i End SubTrigger the procedures by button clicks: Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click encrypt() End Sub Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click decrypt() End Sub

Android :: Encrypt And Decrypt File In Droid? stackoverflow.com

I want to encrypt file and store it in SD card. I want to decrypt that encrypted file and store it in sd card again. I have tried to encrypt file by opening as file stream and encrypt is but it is not working. I want some idea how to do this.

File After Custom Decryption social.msdn.microsoft.com

Ok so I've made an encrypting/decrypting program and I've found a small bug with it. It will encrypt plain text files fine, except for the last character ( does anyone know how to fix this by the way? ) But when it comes to enrypting PNG Images.. well here's is the before and after files: [Code]...

ActionScript 2.0 :: Decryption And Dynamic A Text File www.actionscript.org

I am kind of new to AS and not sure how to decrypt a text file. If I have a text file that is on my web server (which I need to be encrypted) and is used to retrieve variables for Dynamic Text fields. How do I decrypt the file and then take the variables and put them in the Dynamic Text fields? What is the best method to make the files unreadable but can be decrypted by the flash file? Currently I use this to get the variables and put them in Dynamic Text field but I want to add some kind of encryption to this. [Code]....

Usage Of Dtutil And Dtexec In SQL Server 2005 SSIS social.msdn.microsoft.com

1) We are migrating data from SQL Server 2000 to 2005 DB. 2) We are developing SSIS packages in client, build, deploy and install and copying to SQL Server 2005 server to execute for migration. 3) For this we encrypt all packages with password, then decrypt all while executing in a batch file using dtexec. This works fine. 4) What does not work is executing a master execute task in which are individual execute tasks. This is so since the other packages are still encrypted. 5) We decrypted them separately first using dtutil using Decrypt and Copy/Move option but while executing error is thrown that these other packages are still protected by password. 6) Do we need to decrypt, then encrypt using default package protection level and then decrypt again. 7) How exactly to just execute a master package when packages are developed on client.

Encrypting Text www.xtremevbtalk.com

How to encrypt and decrypt a data(text)? For example, encrypt the text in textboxes and vice versa. I need to store encrypted data to smart card. Thank you

Help With Encryption www.xtremevbtalk.com

Hi everyone.I am currently creating a simple text encryption program. The program simply encrypts the text, which it then saves to a file. I use two functions for encrytping and decrypting.What i want to do now, is when a user clicks on the file (from within explorer etc.), i want my program to automatically load up instead of the file being opened into a text file.How can i do this?Thanks in advance!

Use RSA To Encrypt Application Serial Number? social.msdn.microsoft.com

I'd like to use RSA to Encrypt application Serial Number. but when you try to encrypt text and did it again both time the results will be different i don't like to decrypt to text to protect the application from hackers. any other useful way to protect the application without Decrypt to text. i mean compare Encrypted code not the original text also i need to stop application if there is crackers application starts or memory dump application or memory injection . i need the full solution to protect the application . i wish the armadillo (software Passport ) is here for vb.net application how great it is ... i miss him may be we start discussion about protect application . also what about encrypt all application code to disable resource hacker applications .

Run Application From Memroy, No Shelling www.vbforums.com

Hello, This is my first Thread, i need help please._________________________________I want to load an exe or application program in memory and run from there, i mean my one application will be encrypted and stored as unknown encrypted binary format, i will load it, decrypt it and want to load it directly from memory ( No temporary file and shell)What am i doing_________________I am trying to develop application like upx , my application will encrypt another exe file and store it as encrypted binary file, when my application is loaded then it will decrypt the encrypted exe file and should directly run from memory without saving it in temporary folder.Pseudo Code____________Open EncryptedExe File As BinaryRead In Array ACloseDecrypt A 'now array A store an exe file with header "MZ...to end"Run the Application A directly from memoryNote: I think this technique will stop beginners cracker to edit recourse and strings from exe file. Thanks..

Encrypted Files Copied To Remote PC www.codeguru.com

Hi guys,I have a central server that runs encryption to secure the file contents. On occasion, an authorised user may request the server copy archived files to his/her computer for local manipulation.My VB program which receives the file copy request duly copies down to the user's computer the files requested, but they are still encrypted! (Therefore the user cannot open or delete or move them).What are my options for ensuring the files are decrypted when they arrive on the user's computer? The encryption was applied on the central server - so the central server has to decrypt the files before delivery.For some (wrong) reason, I thought that if encrypted files were copied to somewhere, they'd be decrypted. This is obviously not the case!Note that the user's computer is running NTFS. Perhaps changing the user's file system to FAT32 would help? Is there a switch on the "copyfile" API to decrypt files on copy?Help appreciated!Mark

Encrypted Password In A Database Howto? www.xtremevbtalk.com

Hello,I'm working on a project where a user (a clerck in a bank) logs in and enters a password. He cannot set this password (it is a given one), it is stored in a local database and sometimes gets renewed by the central office of the bank.If this password is stored in plain text in the database, someone could just open the database, and read the password from it. So the password neads to be decrypted. I will write a seperate application that writes the password in an encrypted way in the database. Wich functions are available to encrypt this password?Can this then be decrypted? (It shouldn't, I want to compare the ecnrypted password with the encrypted input from the user. If it l can be decrypted, someone could still retrieve the password by decrypting the field from the db).TIA

File Header Help Needed! www.vbforums.com

HiThe encryption program im working on encrypts files of any type then gives them the extension (.fex)When the user then comes to decrypt the file, they would input the password and decryption would begin. The thing is currently if the user inputs the wrong password the file will still be decrypted with the given incorrect password thus scrambling the data beyond repair.What i want to do is take the password and encrypt it with MD5 and then store that in the file, so that when the user inputs the password the program will compare it and know if its correct or not. And if correct remove the stored password and decrypt the file.So my Question is how would i go about this?Assuming a File Header?When a password is encrypted to a hash string with MD5 it will always be 32 characters in lenth if that helps any. Would really appreciate any help on this, as its all i need to do to finalise my program.Cheers

Make Some Simple Program For Encrypt / Decrypting Message Using VB? www.xtremevbtalk.com

i want to make some simple program for encrypt / decrypting message using VB, my problem was when i want to decrypt the message, the result was incorrect, Code: Dim decryptor As Integer = TextBoxhasilencrypt.Text Dim privatekey As Integer = Labelprivatekey.Text Dim modulus As Integer = LabelModulus.Text [code].... the logic error on the program was when the "power of" are odd

Encrypt Or Decrypt Text? social.msdn.microsoft.com

I am using vb.net 2008 i want to Know how can i encrypt text in a text box save it to a file then read the file decrypt the text and finaly display it in text box .

Encrypt A String In Python And Decrypt That Same String ? stackoverflow.com

I have a string that I would like to encrypt in Python, store it as a cookie, then in a PHP file I'd like to retrieve that cookie, and decrypt it in PHP. How would I go about doing this?All cookie talk aside, lets just say I want to encrypt a string in Python and then decrypt a string in PHP

Encrypt/Decrypt A Whole File www.vbforums.com

Hey, Using the code below, i want to be able to ENCRYPT a whole TEXT FILE...I am not sure how i would make it ENCRYPT a whole file using this, So could someone make it workable? or maybe if someone has an encryption script maybe LIKE THIS ONE or better that will encrypt a FILE/ DECRYPT::USE:: I am saving a bunch of program settings, and i don't want people to edit them,, so i want my program to SAVE ALL THE SETTINGS, to the file, ENCRYPT IT, and then when i want to open it, it will DECRYPT , and Read it (I have it so i can read it)..THANKS ALOTPS: or would i have to import it all into a textbox, and then encrypt the Textbox?? THANKS- i would like to get the program to encrypt it with out textfile.. thanks againCode:'<<------------------------------------------>>'START EN/DE crypt PARTS'<<==========================================>>#Const CASE_SENSITIVE_PASSWORD = FalsePrivate Sub cmdEncrypt_Click() ' You can encrypt twice for extra security txtText = EncryptText((txtText), txtPassword) txtText = EncryptText((txtText), txtPassword)End SubPrivate Sub cmdDecrypt_Click() txtText = DecryptText((txtText), txtPassword) txtText = DecryptText((txtText), txtPassword)End Sub'Encrypt textPrivate Function EncryptText(strText As String, ByVal strPwd As String) Dim i As Integer, c As Integer Dim strBuff As String#If Not CASE_SENSITIVE_PASSWORD Then 'Convert password to upper case 'if not case-sensitive strPwd = UCase$(strPwd)#End If 'Encrypt string If Len(strPwd) Then For i = 1 To Len(strText) c = Asc(Mid$(strText, i, 1)) c = c + Asc(Mid$(strPwd, (i Mod Len(strPwd)) + 1, 1)) strBuff = strBuff & Chr$(c And &HFF) Next i Else strBuff = strText End If EncryptText = strBuffEnd Function'Decrypt text encrypted with EncryptTextPrivate Function DecryptText(strText As String, ByVal strPwd As String) Dim i As Integer, c As Integer Dim strBuff As String#If Not CASE_SENSITIVE_PASSWORD Then 'Convert password to upper case 'if not case-sensitive strPwd = UCase$(strPwd)#End If 'Decrypt string If Len(strPwd) Then For i = 1 To Len(strText) c = Asc(Mid$(strText, i, 1)) c = c - Asc(Mid$(strPwd, (i Mod Len(strPwd)) + 1, 1)) strBuff = strBuff & Chr$(c And &HFF) Next i Else strBuff = strText End If DecryptText = strBuffEnd Function

VS 2005 Encryption/Decryption With Crytography Classes? www.vbforums.com

I'm using the cryptography classes in .net to encrypt and decrypt files. When I encrypt a txt file, then decrypt in my code it works fine. But when I encrypt an xml file and try to decrypt it within my code I get an error saying "padding is invalid and cannot be removed." I am setting the padding during both the encryption and decryption as: PaddingMode.PKCS7. Do you think the file being an xml file has something to do with the error that's occuring? Also, should I or should I not be setting the padding for both encryption and decryption?