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Chaos-based true random bit generators have been demonstrated in many studies to be feasible and secure for crypto-system applications. In this work, we demonstrate that an FPGA-based non-autonomous chaotic oscillator, used as a true random number generator, can be compromised via cryptanalysis attacks. First, we realize non-autonomous chaotic oscillator (previously implemented only in analog form) on a modular FPGA platform. The oscillator architecture is simplified to eliminate the Sin function and is described in details in VHDL. Then, we propose chaotic oscillator attacking system including clock glitch generator to compromise the oscillator by injecting glitches on function clock. The parameters and positions of those glitches are carefully determined to achieve a successful attack. The experimental results show that the system is attacked, and the generated glitched bit-streams are distorted …