Harvest now, decrypt later
Why data encrypted today is already at risk — even before Q-Day arrives.
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Risk math
Mosca inequality
If the time your data must stay confidential (X) plus the time to migrate (Y) exceeds the time until quantum breaks crypto (Z), you have HNDL exposure today.
The formula
X = data shelf-life in years. Y = migration runway in years. Z = years until cryptographically relevant quantum computers. When X + Y > Z, encrypted data captured today may be readable before you finish migrating.
Why boards care
Mosca turns abstract quantum risk into a inequality your board and regulators understand — especially in banking and healthcare where data lives for decades.
Related
Mosca calculator
If X + Y > Z, harvest-now-decrypt-later exposure requires action now.
10 + 5 = 15 vs Z = 8
Inequality holds — HNDL exposure today.