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The oversight committees, particularly the HPSCI, became increasingly alarmed over the role US intelligence agencies were playing in the implementation of the administration's Central American policy. The issue of greatest concern was the CIA's support to the Contra rebels in Nicaragua.
The SPI (as per RFC 2401) is a required part of an IPsec Security Association (SA) because it enables the receiving system to select the SA under which a received packet will be processed. An SPI has only local significance, since it is defined by the creator of the SA; an SPI is generally viewed as an opaque bit string. However, the creator of an SA may interpret the bits in an SPI to facilitate local processing.