Abstract
In this work a new self-synchronized symmetric encryption solution for high speed communication systems necessary to preserve the format of the plaintext is proposed, developed and tested. This new encryption mechanism is based on the block cipher operation mode called PSCFB (Pipelined Statistical Cipher Feedback) and the modulo operation. The confidentiality of this mode is analyzed in terms of its IND-CPA (Indistinguishability under Chosen-Plaintext Attack) advantage, concluding that it can be considered secure in the same way as traditional modes are. The encryption system has been integrated in the physical layer of a 1000Base-X Gigabit Ethernet Interface, where the 8b/10b symbol flow is encrypted at line rate. Moreover, an implementation of the proposed system has been carried out in an FPGA (Field Programmable Gate Array) device. Finally, an encrypted optical link has been tested with real Ethernet frames, getting maximum throughput and protecting the data traffic from passive eavesdroppers.
Highlights
In recent decades, we have witnessed the rise of broadband networks, mainly thanks to the advance of communication standards in physical media such as optical fiber
It is based on a recommended block cipher working in an operation mode that is a synergic combination of PSCFB and CTR-MOD [20] modes
Bursts of 1024-byte length frames were tested with a duration of 107 frames transmitted using the maximum possible bandwidth of 98%, according to the minimum standard IFG (Inter Frame Gap). Another advantage is that the proposed encryption system only introduces a total extra latency of 48 ns in the PCS datapath, which includes the overall latency of PSCFB-MOD mode without queues
Summary
We have witnessed the rise of broadband networks, mainly thanks to the advance of communication standards in physical media such as optical fiber. In order to reduce the hardware complexity of possible selfsynchronous FPE stream ciphers, in this work a new structure able to preserve the format of the plaintext is proposed It is based on a recommended block cipher working in an operation mode that is a synergic combination of PSCFB and CTR-MOD [20] modes. Since this new proposed operation mode uses as underlying block cipher a recommended binary block cipher instead of an FPE one, as in [14] and [18], it is possible to reduce the hardware complexity introduced by the Feistel structure.
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