Photorec custom file format (*.abc) but using no signature

[PeterB]

Hi there,

How do I use (Photorec ?) to recover all files with a specific custom extension (e.g. *.abc) but without specifying a particular signature? This file does not have a constant signature anywhere in its contents.

I have followed the instructions here

http://www.cgsecurity.org/wiki/Add_your ... o_PhotoRec

And using a null string at offset zero, but understandably that doesn't work.

regards
Peter

[cgrenier]

If there is no constant specific to the file type, the data need at least to have some properties that can be use to identify the file. In this case, a programmer can add the necessary code to PhotoRec.

[PeterB]

The files are binary and encrypted so unfortunately the only common property is its extension. Is that at all possible to cater for by writing specific source code for PhotoRec ?

[cgrenier]

The only possibility will be to add some code to test the decryption of each data block and if it works, consider it's the beginning of a new file.