Keyed Polar Coding for Physical-Layer Security without Channel State Information
- Resource Type
- Authors
- Thyago M. S. Pinto; Joao P. Vilela; Willie K. Harrison; Marco Gomes
- Source
- ICC
- Subject
- business.industry
Computer science
Keystream
Physical layer
Data_CODINGANDINFORMATIONTHEORY
Redundancy (information theory)
Channel state information
Cyclic redundancy check
business
Encoder
Decoding methods
Computer Science::Information Theory
Computer Science::Cryptography and Security
Computer network
Communication channel
- Language
Polar codes have been shown to provide an effective mechanism for achieving physical-layer security over various wiretap channels. A majority of these schemes require channel state information (CSI) at the encoder for both intended receivers and eavesdroppers. In this paper, we consider a polar coding scheme for secrecy over a Gaussian wiretap channel when no CSI is available. We show that the availability of a shared keystream between friendly parties allows polar codes to be used for both secure and reliable communications, even when the eavesdropper knows a large fraction of the keystream. The scheme relies on a predetermined strategy for partitioning the bits to be encoded into a set of frozen bits and a set of information bits. The frozen bits are filled with bits from the keystream, and we evaluate the security gap when the cyclic redundancy check-aided successive cancellation list decoder is used at both receivers in the wiretap channel model.