Continuous Encryption Functions for Security Over Networks
This addresses security issues in wireless communications and online applications by proposing a more robust encryption method, though it appears incremental as it builds on prior CEF frameworks.
The paper tackles the vulnerability of existing continuous encryption functions (CEFs) for network security by showing that methods like dynamic random projection and IoM hashing are easier to attack than previously thought, and introduces a new SVD-based CEF that is empirically hard to attack and outperforms IoM algorithm 2 in bit-error-rate performance.
This paper presents a study of continuous encryption functions (CEFs) of secret feature vectors for security over networks such as physical layer encryption for wireless communications and biometric template security for online Internet applications. CEFs are defined to include all prior continuous "one-way" functions. It is shown that dynamic random projection and index-of-max (IoM) hashing algorithm 1 are not hard to attack, IoM algorithm 2 is not as hard to attack as it was thought to be, and higher-order polynomials are easy to attack via substitution. Also presented is a new family of CEFs based on selected components of singular value decomposition (SVD) of a randomly modulated matrix of feature vector. Detailed empirical evidence suggests that SVD-CEF is hard to attack. Statistical analysis of SVD-CEF reveals its useful properties including its sensitivity to noise. The bit-error-rate performance of a quantized SVD-CEF is shown to exceed that of IoM algorithm 2.