— The paper deals with the design and realization of a secure multicarrier modem on FPGA. The crypto-modem principle is adopted. An encryption block is integrated in the modem transmitter and a decryption block is integrated in the modem receiver. Different Encryption/Decryption IPs (Intellectual Properties) implementing DES (Data Encryption Standard), 3DES (Triple DES) and AES (Advanced Encryption Standard) algorithms are developed and/or adapted in order to estimate the feasibility as well as the time and area efficiency of the crypto-modem. The design language used is VHDL and the crypto-modem system is validated in ISE environment, using Xilinx development board with XC4VSX35 circuit from VIRTEX-4 family.