PPL 026 / 177 permanent IDsPrize Problem Ledger · PPLChecked 2026.07.27
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Prize Problem LedgerCerticom ECC ChallengePPL 026Certicom ECC challenge · ECCp-191

Permanent problem IDPPL 026

Source-statedInstitutionalcomputational target

Cryptography

Certicom ECC challenge · ECCp-191

For the published ECCp-191 instance (prime-field, 191-bit challenge identifier), compute the private scalar ℓ satisfying ℓP=Q and document the complete method.

elliptic curvesdiscrete logarithmprime-field, 191-bit challenge identifier
01

The problem

For the published ECCp-191 instance (prime-field, 191-bit challenge identifier), compute the private scalar ℓ satisfying ℓP=Q and document the complete method.

Open since1997challenge launch
Last checked2026.07.27Catalog verification
02

Reward offers

Offer 01$40,000Certicom Corp. / BlackBerry
Documented

The first correct emailed solution wins after third-party verification. Individuals or groups may enter; a group splits one award. The sponsor is sole arbiter and reserves rights to change amounts or terminate the challenge.

The current official ECC page says the challenge still runs; the detailed rules were last updated in 2009, so confirm logistics before major work.

Award source ↗Rules ↗
03

Sources & reading

3 unique reference linksOfficial outstanding-challenges page Claim or award rules Current Certicom ECC overview
04

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