Bornstein, Eric Rothman2020-08-282020-052020-06-172020Bornstein, Eric Rothman. 2020. Secure Messaging. Bachelor's thesis, Harvard College.https://nrs.harvard.edu/URN-3:HUL.INSTREPOS:37364683This work examines the cryptographic notion of secure two-party communication. It analyzes optimal confidentiality and authenticity in the setting of an insecure channel, insecure user states, and leaky randomness. It presents five constructions of messaging systems in the literature that range in security levels and efficiencies. It compares the schemes' overall advantages and disadvantages, including formally defining their levels of security.application/pdfenThesis or Dissertation2020-08-28