Internet Protocol Security -LRB- IPsec -RRB- is a protocol suite for securing Internet Protocol -LRB- IP -RRB- communications by authenticating and encrypting each IP packet of a data stream .

IPsec is a collection of protocols for securing Internet Protocol -LRB- IP -RRB- communications by authenticating -LRB- and optionally encrypting -RRB- each IP packet of a data stream .
