"Topics in Cryptology - CT-RSA 2017" is a collection of scholarly contributions documenting the results of the Cryptographer's Track at the RSA Conference 2017. This conference took place in February 2017 in San Francisco. This volume includes 25 carefully selected and peer-reviewed papers, which were chosen from a total of 77 submitted manuscripts. The CT-RSA has established itself as a significant publication platform in the field of cryptography, covering a wide range of topics, including both public and symmetric key cryptography, as well as cryptographic protocols and their implementation security. This year, current topics such as cryptocurrencies and white-box cryptography were also included in the call for submissions.