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TinySec: Performance Characteristics

TinySec: Performance Characteristics. Chris K :: Naveen S :: David W January 16, 2004. This Talk. Recent results Measurements on Mica2s (TOS 1.1.2) Latency Bandwidth Power Stress testing Hardware crypto comparison & implications 802.15.4 (e.g. CC2420). TinySec Review: How & Why.

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TinySec: Performance Characteristics

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  1. TinySec:Performance Characteristics Chris K :: Naveen S :: David W January 16, 2004

  2. This Talk • Recent results • Measurements on Mica2s (TOS 1.1.2) • Latency • Bandwidth • Power • Stress testing • Hardware crypto comparison & implications • 802.15.4 (e.g. CC2420)

  3. TinySec Review: How & Why • Link layer security mechanism • Hop-by-hop, not end-to-end • Better support for aggregation • Enables higher level keying protocols • Low overhead security in software • Cryptographic checksum (MAC) • Ensures integrity • Enforces access control • Optional encryption

  4. TinySec Performance • Characterize Overhead: Energy, Latency, Bandwidth. • Factors for TinySec overhead • Computation • Larger packet sizes • Can predict overhead caused by packet sizes • Measurement goal: Show computation overhead is minimal • Note: crypto HW only reduces computation overhead

  5. Packets & Predicted Overhead Old packet (CRC): +7 b Authentication Only (TinySec-Auth): +8 b Authentication, Encryption (TinySec-AE) : +12 b IV

  6. Latency Test Setup LM • Setup: • 4x9 grid in Woz of Mica2s • Landmark routing code from midterm demo • 200 measurements per hopcount B • Test purpose: • Measure latency at different hopcounts • Determine difficulty in adding TinySec to existing application • Integrate with SystemC • Successfully transmitted 70,000+ packets: Our stress test A BS

  7. Latency

  8. Latency: Byte Times

  9. Energy Test Setup • Single mote transmitting a packet • Measure voltage drop with oscilloscope

  10. Energy +3% +10%

  11. Bandwidth Test Setup • Vary number of senders • Each sender sends as fast as it can • Measure number of packets successfully received in a time period

  12. Bandwidth TinySec-Auth: same throughput TinySec-AE: 6% less throughput

  13. Performance Summary

  14. TinySec Status • New version working with 1.1.3 stack • To use: TINYSEC=true • Suggestion: base new stacks off of TinySec stack

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