linguistic:paraphrasing, information:filtering, structural:summarization
Human rights in emergency situations

With the exception of non-derogable human rights (international conventions class the right to life, the right to be free from slavery, the right to be free from torture and the right to be free from retroactive application of penal laws as non-derogable), the UN recognises that human rights can be limited or even pushed aside during times of national emergency, although it clarifies:

the emergency must be actual, affect the whole population and the threat must be to the very existence of the nation. The declaration of emergency must also be a last resort and a temporary measure.

Rights that cannot be derogated for reasons of national security in any circumstances are known as peremptory norms or jus cogens. Such International law obligations are binding on all states and cannot be modified by treaty.