See ESC right:

Social security

Relevant ICESCR Articles:

09: The States Parties to the present Covenant recognize the right of everyone to social security, including social insurance.

Related Documents:

Additional Protocol to the American Convention on Human Rights in the Area of Economic, Social and Cultural Rights; "Protocol of San Salvador"

Convention on the Elimination of All Forms of Discrimination Against Women

European Social Charter

International Convention on the Elimination of All Forms of Racial Discrimination

Universal Declaration of Human Rights