decrypt « Operation « Java I/O Q&A

1. Problem in decrypting files in Java SE

import javax.crypto.*;    
import javax.crypto.spec.SecretKeySpec;    
class Blowfish
    public static void main(String[] args) throws Exception 

2. How to Encrypt or Decrypt a File in Java?

I want to encrypt and decrypt a file in java, i had read this url and i got two files namely public Security certificate and private security certificate ...

3. Need Help in Encrypting as well as Decrypting a file in java?

I want to encrypt and decrypt a file in java, i had read this url and got two files namely public Security certificate and private security certificate file ...

4. Can't decrypt file encrypted using openssl AES_ctr128_encrypt

I have a file encrypted using the following code in c:

unsigned char ckey[] =  "0123456789ABCDEF"; 
unsigned char iv[8] = {0};
AES_set_encrypt_key(ckey, 128, &key);
AES_ctr128_encrypt(indata, outdata, 16, &key, aesstate.ivec, aesstate.ecount, &aesstate.num);
I have to ...

6. How to Decrypt the Region Entity of .dxf File in java

I am trying to read a dxf file in java. But there is a REGION Entity where all the code is encrypted. I hava also done some research work and found ...

7. Encrypt and Decrypt files Libraries

8. Decryption of file is taking too much time.

I am facing a problem while decrypting a file. The decryption process is too slow. The algorithm i am using is RSA public key encryption. Which is toooooo slow while decrypting the file. I am doing the following steps ... 1) I read the encrypted data from the file 2) decrypt it and save it in a list 3) Then read ...

9. encrypt and decrypt a file in Java

Giving you a very basic example of encode and decode a string using AES. Hope this might help package foo; import; import; import javax.crypto.BadPaddingException; import javax.crypto.Cipher; import javax.crypto.IllegalBlockSizeException; import javax.crypto.NoSuchPaddingException; import javax.crypto.spec.SecretKeySpec; public class EncryptDecryptTest { public static Cipher getCipher( String synchro1, String synchro2, String synchro3, String synchro4,boolean isEncryptMode) throws NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException { byte raw[] = (synchro1 + ...

10. How to select specificied parts of a file to decrypt

Hi JavaRanch, My recent work involved encrypting sensitive information while logging. It was for a Interactive Voice Response (IVR) application where users would enter User IDs and Passwords and they needed to be masked. It will be decrypted in a UI by people who have access to key. With a lot of help from Coderanch and by doing a bit of ...

11. AES file Encryption and Decryption

Hi all I'm preparing a simple program to encypt/decrypt a file using AES I've noticed a problem; is that the encrypted file is always 16+x bytes larger than the plain file and when i try to decrypt it to get the original file, it is not OK the size would be x bytes larger! (x according to my understanding should be ...

12. Decrypt file, but don't know the cipher used to encrypt the file

DrClap wrote: If the cipher is any good at all, then you can't tell. agreed but if one tries to decrypt using each of the encryption algorithms applicable to a given key size (and there are not that many) then one might be able to tell which is being used. BUT, of course, there is more than just an encryption algorithm ...

13. how to decrypt a file ?