The French non-profit that operates French top-level domains, like .fr, has inserted a secret message of support for Charlie Hebdo, a newspaper attacked by terrorists, in the data used to identify the Web sites it helped register.

Association Française pour le Nommage Internet en Coopération, or AFNIC, appears to have added text art spelling out "Je Suis Charlie" to the records of sites whose top level domain names they help administer, as noted by several users on Twitter. You won't see the text art message show up on the actual Web sites. Instead, it shows up if you run a search to look at a French site's registration data, commonly called a "WHOIS" lookup.

Je Suis Charlie, which means "I am Charlie," has been a rallying cry for supporters of the satirical weekly newspaper attacked on Wednesday -- an assault thought to be in retaliation for caricatures of the prophet Muhammad that the paper has published.

AFNIC's Twitter account has also changed its profile pictures to the phrase, and it shared this message of support Thursday: