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We present an automatic implementation system of security protocols based in formal description techniques. A sufficiently complete and concise formal specification that has allowed us to define the state machine that corresponds to a security protocol has been designed to achieve our goals. This formal specification makes it possible to incorporate in a flexible way the security mechanisms and functions (random numbers generation, timestamps, symmetric-key encryption, public-key cryptography, etc). Our solution implies the incorporation of an additional security layer LEI (Logical Element of Implementation) in the TCP/IP architecture. This additional layer be able both to interpret and to implement any security protocol from its formal specification. Our system provides an applications programming interface (API) for the development of distributed applications in the Internet like the e-commerce, bank transfers, network management or distribution information services that makes transparent to them the problem of security in the communications.