Patent ID: 8099367

Claim:
A system for variably generating cryptographic securities, for communications, comprising: a host computer configured to generate an unencrypted communication; a postal security device in communication with said host computer, said postal security device having an information input; a cryptologic module in said host computer external to said postal security device, having a module output connected to said information input of said postal security device, said cryptologic module being configured to apply a cryptoalgorithm stored in said cryptologic module to said communication to generate a cryptoalgorithm output and to emit the generated cryptoalgorithm output at said module output; a logic circuit in said postal security device, connected to said information input and being configured to apply a digital signature algorithm to said cryptoalgorithm output emitted from said cryptologic module, to generate data for a cryptographic signature and to emit said data for cryptographic signature at an output of said logic circuit; and said cryptologic module comprising a control data input that receives control data generated by said host computer and being configured to modify said cryptoalgorithm output using said control data, a plurality of logic circuits that affect said cryptoalgorithm output, a switch connected between each of said logic circuits and said cryptoalgorithm output, and connected to said control data input for connecting one of said logic circuits to said cryptoalgorithm output dependent on said control data, and a first of said logic circuits containing a first cryptoalgorithm and a second of said logic circuits containing a second cryptoalgorithm, and said switch connecting one of said first cryptoalgorithm and said second cryptoalgorithm to said cryptoalgorithm output dependent on said control data.