Quotation
How much has encryption changed in the few years since the book:
you. There’s only one outgoing port in the entire network, and all that it allows past is passphrase-encrypted packets from specific nodes, all of which are secure. And even then the packets can only go to certain external IPs.
===
A Critique of the Thresher Discrete Logarithm Encryption Standard EVP-4: A Theoretical Back-Door Cryptanalysis Attack Strategy Using a Group of φ-Torsion Points of an Elliptic Curve in Characteristic φ.