The names of three of the Paris attackers appear in files leaked from the Islamic State militant group, according to German media reports.
The three are believed to have carried out the worst attack, at the Bataclan theatre, where 90 people died.
The IS files, obtained by German, UK and Syrian opposition media, are said to identify thousands of jihadist recruits from at least 40 countries.
German officials have said the files can be assumed to be genuine.
Roughly 22,000 fighters are reportedly identified by the documents, with one file for each recruit listing a name, address and other information. However, many of the names given may be duplicates.
Among them are Samy Amimour, Foued Mohamed-Aggad and Omar Ismail Mostefai, the three men who attacked the Bataclan during a concert by Eagles of Death Metal, killing 90.
The documents have been obtained by German public broadcasters WDR and NDR, and the daily Sueddeutsche Zeitung.
WDR said the files indicate that the three men entered IS territory in 2013 and 2014.
Germany's Interior Minister Thomas de Maiziere earlier said the information contained in the files could help to prosecute IS fighters, and help prevent future recruitment.
Files were first published online (documents in Arabic) by Zaman Al-Wasl, a Qatari-based Syrian news website.
Sixteen Britons reportedly appear in the files, including Junaid Hussain and Reyaad Khan, who were killed in September in Syria by an RAF drone strike.
Two others listed, Kerim Marc B and Abdelkarim B, are currently on trial separately in Germany, while another two Germans on the list, Farid Saal Yassin Oussaiffi, have appeared in IS videos
Dutch media identified Abu Jihad al-Hollandi from the documents as Amsterdam teenager Achraf Bouamran, who was killed in a US air strike on the Syrian IS stronghold of Raqqa in January 2015. His file reads: "Born 1997. Moroccan origin. Wants to be a fighter."