Secret Communication with Feedback

Secure communication with feedback is studied. An achievability scheme in which the backward channel is used to generate a shared secret key is proposed. The scenario of binary symmetric forward and backward channels is considered, and a combination of the proposed scheme and Maurer's coding scheme is shown to achieve improved secrecy rates. The scenario of a Gaussian channel with perfect output feedback is also analyzed and the Schalkwijk-Kailath coding scheme is shown to achieve the secrecy capacity for this channel.

• Type: Journal
• Year: 2008
• Where: CORR
• Authors: Deniz Gündüz, D. Richard Brown III, H. Vincent Poor
• Keywords: Backward Channels, Binary Symmetric Forward, CORR 2008, Education, Shared Secret Key