Embassy cables are a formal term for (almost always confidential) diplomatic messages sent from an embassy to the foreign ministry (or department) of the embassy's parent nation. Thus, an "embassy cable" from the US Embassy in Germany would be sent to the US Department of State.
Embassy cables typically include diplomatically sensitive information, including frank assessments of political or economic situations in the embassy's host country, details on important political figures, military info, and possibly even espionage results. They are considered sacrosant, and are not to be intercepted or monitored (they are the communications equivalent of the diplomatic pouch). Of course, most nations nonetheless monitor these from other countries, but almost always refrain from making the contents known publically.
The term comes from a time when messages were sent via submarine communication cables.
Wikileaks did not like a joke he made about them.
All the WikiLeaks are available on wikileaks.org
Yes I am against what Julian Assange is doing. His actions could endanger the U.S. because terrorists could get the information he puts on wikileaks and use it against the united states.
If governments feel there is a threat that their communication will be published, then yes, there is more incentive to be honest.
WikiLeaks is basically a form of "watchdog" journalism - keeping leaders on their toes.
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No.
It makes government create new ways to hide information, it may promote short term transparency but it creates an incentive to create better ways of protecting secrets.