## Authentication in Insecure Environments

- Sebastian Pape
- Springer Fachmedien Wiesbaden
- 2014

@article{Jabri1996TheUD, title={The Unicity Distance: An Upper Bound on the Probability of an Eavesdropper Successfully Estimating the Secret Key}, author={A. Kh. Al Jabri}, journal={Inf. Process. Lett.}, year={1996}, volume={60}, pages={43-47} }

- Published 1996 in Inf. Process. Lett.
DOI:10.1016/S0020-0190(96)00138-X

The unicity distance, U, of a secret-key cipher is defined by Shannon as the minimum amount of intercepted ciphertext symbols needed, in principle, to uniquely determine the secret key and, therefore, break the cipher. Accordingly, for a ciphertext of size N symbols less than U, the estimated key will have a nonzero probability of error. Of interest is knowing the chance or probability that an eavesdropper, using the besf estimation rule, successfully estimates the secret key from N ciphertext… CONTINUE READING