Security Property 6:Freshness Freshness -Verify that message is recent,is not replayed -e.g.,a check becomes invalid if not cashed within 6 months The expired check still has integrity,but not freshness -Mechanisms ●Nonce ●Expiration time 99 Security Property 6: Freshness  Freshness ─ Verify that message is recent, is not replayed ─ e.g., a check becomes invalid if not cashed within 6 months ● The expired check still has integrity, but not freshness. ─ Mechanisms ● Nonce ● Expiration time