The format restricts the type and quantity of metadata that can be associated with an image. This restriction has been removed using a work around the 31-bit offset values in version 6 of EnCase. Up to version 5 of EnCase the segment files could be no larger than 2 GB. Disk imagesĬan be split into multiple segment files (e.g., for archival to CD or Not only is the format is compressible, it is also searchable.Ĭompression is block-based, and jump tables and "file pointers" are maintained in the format's header orīetween blocks "to enhance speed".
PRODISCOVER FORENSICS LATEST VERSION PASSWORD
Optional password the header concludes with its own checksum. Contained in the header are the date and time ofĪcquisition, an examiner's name, notes on the acquisition, and an Interlaced with checksums (Adler-32) for every block of 64 sectors (32 KB), andįollowed by a footer containing an MD5 hash for the entireīitstream. Of an acquired disk, prefixed with a "Case Info" header, (.E01) format contains a physical bitstream This format is heavily based on ASR Data'sĮxpert Witness Compression Format. Perhaps the de facto standard for forensic analyses in lawĮnforcement, Guidance Software's EnCase Forensic usesĪ closed format for images. Sometimes they can be used with other programs whose authors have specifically reverse-engineered the software. These file formats were developed for use with a specific forensics program. It is often accompanied by meta data stored in separate formats. This format is a RAW bit-by-bit copy of the original. User supplied meta data is embedded in a meta data section within the file.Ī very important feature that gfzip focuses on extensively is the use of signed data and meta data sections using x509 certificates. Gfzip uses multi level SHA256 digest based integrity guards instead of SHA1 or the deprecated MD5 algoritm. Uncompressed disk images can be used the same way dd images are, as gfzip uses a data first footer last design. Gfzip aims to provide an open file format for 'forensic complete' 'compressed' and 'signed' disk image data files. AFF4 support fuse to present the images transparently to clients. AFF4 also supports cryptography and image signing. This makes it trivial to chop up an image in many different ways with no storage overheads (for example chop up a memory image into the different process address spaces, extract TCP streams from a PCAP file with no copying overheads or extract all files from a filesystem with no copying). The format includes support for maps - which are zero copy transformations of data - for example, instead of storing a whole new copy of a carved file we just store a map of the blocks allocated to this file. Storage can be done using regular HTTP, as well as imaging directly to a central HTTP server using webdav. It features a choice of binary container formats such as Zip, Zip64 and simple directories. AFF4 is geared towards very large corpuses of images. These file formats were developed independently of any specific forensics package.įull details of the format and a working implementation can be downloaded from AFF4ĪFF4 is a complete redesign of the AFF format. 2.9 Programs with no specific file format.2.5 Rapid Action Imaging Device (RAID)'s Format.2.3 ProDiscover Family's ProDiscover image file format.2.2 ILook Investigator's IDIF, IRBF, and IEIF Formats.1.3 gfzip (generic forensic zip) file format.
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