This book constitutes the refereed proceedings of the Cryptographers Track at the RSA Conference 2013 CT-RSA 2013 held in San Francisco CA USA in February/March 2013. The 25 revised full papers presented were carefully reviewed and selected from 89 submissions. The papers are grouped into topical sections covering: side channel attacks digital signatures public-key encryption cryptographic protocols secure implementation methods symmetric key primitives and identity-based encryption.