Verifying and Validating the Integrity of Chandra FITS Files

Checksums and Digests

For general FITS issues, see the information provided by the FITS Support Office and the FITS archive at NRAO.
In the following we shall use two mechanisms for verifying the integrity of a FITS file or the data portion of an individual HDU (Header-Data Unit): FITS checksums and SHA digests.

Available Data Integrity Tools

In this section, the tools and their mechanics are described. The following section will provide directions on how to apply them.

Validating FITS Files

There are various alternatives for validating FITS files, depending on one's requirements and objectives. Below we suggest strategies to answer the three or four most common questions relating to the integrity and authenticity of data files.

This page is written and maintained by Arnold Rots (

This page was last modified on 1998-03-02T14:55:00.