System for providing security for a protected network resource, comprising: a network access apparatus in communication with a plurality of receivers (102a, 102b, 102c, 102d) for receiving signals from a remote source, wherein the network access apparatus is capable of collecting current microprint data for each receiver (102a; 102b; 102c; 102d) of said plurality of receivers (102a, 102b, 102c, 102d), the current microprint data for a receiver (102a, 102b, 102c, 102d) of said plurality of receivers (102a, 102b, 102c, 102d) being a plurality of jitter values, each jitter value being based on a difference in arrival times of at least two timing signals (204a, 204b) received from said remote source at said receiver (102a, 102b, 102c, 102d) over a predefined period of time; and an authentication server in communication with the network access apparatus, the authentication server having access to an LSDF for each receiver (102a; 102b; 102c; 102d) of said plurality of receivers (102a, 102b, 102c, 102d), wherein the LSDF for a receiver (102a, 102b, 102c, 102d) of said plurality of receivers (102a, 102b, 102c, 102d) is a plurality of jitter values, each jitter value being based on a difference in arrival times of at least two timing signals (204a, 204b) received from said remote source at said receiver (102a; 102b; 102c; 102d) over a predefined period of time anterior to the predefined period of time for the microprint data values, wherein the network access apparatus is configured for providing current microprint data for each receiver (102a; 102b; 102c; 102d) of said plurality of receivers to the authentication server, and wherein the authentication server is configured for comparing the current microprint data for each receiver (102a; 102b; 102c; 102d) of said plurality of receivers (102a, 102b, 102c, 102d) to the LSDF associated with the receiver (102a; 102b; 102c; 102d) to authenticate an access request. a network access apparatus in communication with a plurality of receivers (102a, 102b, 102c, 102d) for receiving signals from a remote source, wherein the network access apparatus is capable of collecting current microprint data for each receiver (102a; 102b; 102c; 102d) of said plurality of receivers (102a, 102b, 102c, 102d), the current microprint data for a receiver (102a, 102b, 102c, 102d) of said plurality of receivers (102a, 102b, 102c, 102d) being a plurality of jitter values, each jitter value being based on a difference in arrival times of at least two timing signals (204a, 204b) received from said remote source at said receiver (102a, 102b, 102c, 102d) over a predefined period of time; and an authentication server in communication with the network access apparatus, the authentication server having access to an LSDF for each receiver (102a; 102b; 102c; 102d) of said plurality of receivers (102a, 102b, 102c, 102d), wherein the LSDF for a receiver (102a, 102b, 102c, 102d) of said plurality of receivers (102a, 102b, 102c, 102d) is a plurality of jitter values, each jitter value being based on a difference in arrival times of at least two timing signals (204a, 204b) received from said remote source at said receiver (102a; 102b; 102c; 102d) over a predefined period of time anterior to the predefined period of time for the microprint data values, wherein the network access apparatus is configured for providing current microprint data for each receiver (102a; 102b; 102c; 102d) of said plurality of receivers to the authentication server, and wherein the authentication server is configured for comparing the current microprint data for each receiver (102a; 102b; 102c; 102d) of said plurality of receivers (102a, 102b, 102c, 102d) to the LSDF associated with the receiver (102a; 102b; 102c; 102d) to authenticate an access request.