Olly, the author of OllyDbg , presents his new open source joke: PAPERBACK v1.10 Updated by Michael Mohr Download PaperBack v1.10 Download sources v1.10 PaperBack version 1.00 does not implement AES encryption properly.  Specifically: a) The key used for (en|de)cryption in version 1.00 provides at most an effective key strength of less than 50 bits (and likely far less, perhaps on the order of 15-25 bits, depending on password quality) instead of the expected 256 bits.  Version 1.10 derives the encryption key from the password via key stretching, significantly improving key strength.  This change causes a small delay in the encryption step. b) PaperBack version 1.0 implements ECB mode symmetric encryption.  This mode is subject to a watermark attack and leaks information about the encrypted data.  Version 1.00 changes the encryption mode to CBC, which mitigates this atta...