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Gasser, Oliver 
Gasser, Oliver; Hof, Benjamin; Helm, Max; Korczynski, Maciej; Holz, Ralph; Carle, Georg 
Author affiliation:
In Log We Trust: Revealing Poor Security Practices with Certificate Transparency Logs and Internet Measurements 
Time of production:
Subject area:
DAT Datenverarbeitung, Informatik; ELT Elektrotechnik 
Resource type:
Experimente und Beobachtungen / experiments and observations 
Data type:
Datenbanken / data bases 
Other data type:
CSV-Daten und Datenbank-Export / CSV data and database export 
Database export of Certificate Transparency Log data until October 2017 and certificate data from earlier TLS measurements (HTTPS, IMAPS, SMTPS, POP3S, from 2009 until 2015). Results in CSV format of active HTTPS measurements conducted in October 2017. Analysis scripts as Jupyter notebooks and shell scripts. Additional information and updates to the data and tools can be found at: 
Method of data assessment:
The data resulted from Internet connections to HTTPS servers, where we captured their behavior and configuration parameters such as certificates. The connection to HTTPS servers was established using the ZMapv6 ( and goscanner ( As an additional source certificates from Certificate Transparency Logs were downloaded using certificate-transparency-go ( For analysis purposes the c...    »
Technical remarks:
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The data server also offers downloads with rsync (password m1422427):
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