Cisco@NIST Entropy Workshop

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• Conditioners used to generate unbiased output

• SHA-1 engine

• LFSR (shift register w/ input linear function of

previous state)

• Combination of SHA-1 and LFSR

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• Conditioners used to generate unbiased output • SHA-1 engine • LFSR (shift register w/ input linear function of previous state) • Combination of SHA-1 and LFSR © 2012 Cisco and/or its affiliates. All rights reserved. 12

• Most entropy source designs are based on ring oscillators • Access to raw noise samples is rare • Consecutive raw noise sampling is non-trivial or impossible © 2012 Cisco and/or its affiliates. All rights reserved. 13

Page 1 and 2: Entropy Sources - Practical Designs
Page 3 and 4: • Requirements span a wide range
Page 5 and 6: • Odd number of NOT gates connect
Page 7 and 8: Jitter standard deviation Boltzmann
Page 9 and 10: RO0 RO1 RO2 …….. ROn XOR “Get
Page 11: 5ca2 5d86 6996 6996 ac53 8d72 897e
Page 15 and 16: • Access to entire conditioner in
Page 17 and 18: Four random input bits 0 1 0 0 1 1
Page 19: Thank you.

Cisco@NIST Entropy Workshop

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