encyrption&decryption

secprovider · 07-10-2003, 04:57 AM

Hallo,

I am using Java APIs for encryption & decryption purposes in an application. After encrypting, I save the encrypted file as object into a file. When I decrypt, I read back this file as object and decrypt.

The problem comes here, after decrypting I get normal data+header. So, I also write ,into the file, header part in addition to the real data. How can remove this header part?

thanx

unSpawn · 07-10-2003, 05:32 AM

//moderator.note: moved to Programming, not a security issue.

gdrobson · 07-11-2003, 10:57 PM

Does the header come at the beginning or the end of the file ???

If so then just put a string that you know the file will not contain before the header is placed.

That is, for example, lets say the header is appended to the end of the file after it is encrypted, before encryption at the end of the file put a string of characters on a new line of the file like "~1~1~1~1~22~~", and then after you decrypt the file do not write anything out after you hit the line of the file that contains "~1~1~1~1~22~~" .