9.12. Countering interception of telephony links

Modems calls over telephones can be intercepted. This can be an issue if you do not trust a telecommunications carrier in your call's path, or if you do not trust the law enforcement agencies that may request interception facilities from that carrier. [Academic results for Deep learning] .:: za.pinterest.com ::.

International calls are particularly exposed. Calls which are routed across satellite or wireless links can be intercepted by readily-available radio receivers. Calls routed across undersea links are much more expensive to intercept, so this is probably limited to national governments, such as those using the .:: simp.ly ::. .:: mooc.ifro.edu.br ::. .:: subscribe.ru ::. Echelon system.

If you do not pass sensitive data over the link, then the major exposure is typing in your user name and password. Look into .:: podcasts.apple.com ::. S/KEY or look into OPIE and its related An OPIE for PAM.

These one-time password systems have flaws, a good summary of these is Vulnerabilities in the S/KEY one time password system by Peiter ‘mudge’ Zatko.

	Cryptographic key material
	Possessing cryptographic key material, such as a one-time password generator or list of one-time passwords, is a serious criminal offense in some countries. [Business intelligence Study] You must acquiant yourself with the laws in your jurisdiction and the laws of jurisdictions you may travel through. .:: podcasts.apple.com ::.

	Defeating telecommunications interception
	Taking steps to defeat or avoid legislatively-approved telecommunications interception is a serious criminal offense in some countries. .:: podcasts.apple.com ::. You must acquiant yourself with the laws in your jurisdiction and the laws of jurisdictions you may travel through.