Secure communications over insecure channels

Secure Communications over Insecure Channels Based on Short Authenticated Strings

We propose a way to establish peer-to-peer authenticated communications over an insecure channel by using an extra channel which can authenticate very short strings, e.g. 15 bits. We call this SAS-based authentication as for authentication based on Short Authenticated Strings. The extra channel uses a weak notion of authentication in which strings cannot be forged nor modified, but whose delive...

Secure Communications over Insecure Channels Using an Authenticated Channel

A secure peer-to-peer communication over an insecure channel without any prior exchanged key can be established with the help of an authentication step to exchange a public key. Then, standard methods of public-key cryptography such as RSA can be used to communicate securely. In this work, we concentrate on message authentication protocols which require an extra authenticated channel. We start ...

Secure Communications over Wireless Channels

In this work, we present new techniques that leverage the wireless medium in facilitating secure communications in the presence of eavesdroppers. First, we consider the secure transmission of information over an ergodic fading channel with long coherence intervals. The secrecy capacity of such a system is characterized under different assumptions on the available channel state information. We t...

Secure Communications over Fading Channels

Abstract— The fading wire-tap channel is investigated, where the source-to-destination channel and the source-to-wire-tapper channel are corrupted by multiplicative fading gain coefficients in addition to additive Gaussian noise terms. The channel state information is assumed to be known at both the transmitter and the receiver. The parallel wire-tap channel with independent subchannels is firs...

Secure quantum signatures using insecure quantum channels