Хабр Курсы для всех
РЕКЛАМА
Практикум, Хекслет, SkyPro, авторские курсы — собрали всех и попросили скидки. Осталось выбрать!
А что там можно скрывать, кроме бэкдора?Кодек например. Ну или сам протокол, чтобы все пользовались именно оригинальным клиентом Skype, а не 3rd-party продуктами.
With builds < 3.0 it uses G729 (only common codec) which means 8kHz audio (lower quality) With 3.0 and 3.1 it should use AMR-WB (16kHz)
In other words you can talk to users on versions lower than 3, but may experience some issues?
With 3.2 it uses SKYPES own codec and hence works best otherwise lower quality if they do not upgrade. But as far as SKYPEOOT is concerned its well covered by G727/G711
A speech coder tailored especially for the frame-erasure channel—the sinusoidal voice over packet coder (SVOPC)—is proposed. Based on a classified approach, avoiding interframe coding techniques, and synthesizing its output from slowly varying parameters, the coder is inherently robust to packet loss. SVOPC is based on quasi-harmonic modeling of the linear prediction (LP) residual. Both the sinusoidal amplitudes and phases are explicitly encoded using new methods based on Gaussian mixture models. A wide-band (16-kHz sampling frequency) implementation of the coder provides synthesized speech of good subjective quality at around 20 kbps. SVOPC is evaluated by means of subjective listening tests, and compared to a reference system based on G.722.2 (the AMR wide-band codec). Under frame erasure conditions (5%–30% frame erasures generated according to a Gilbert model), SVOPC clearly outperforms G.722.2.
Так ли безопасен Skype?