The IACR Test-of-Time Award is given yearly for each one of the three IACR General Conferences (Eurocrypt, Crypto, and Asiacrypt). An award will be given at conference Y in year X to honor a paper published in conference Y in year X-15 which has had a lasting impact on the field.
More information about the Test-of-Time award can be found in the policy guidelines document.
TCC also organizes a Test-of-Time award for papers published at TCC according to a slightly different policy.
Nominations are welcomed by the selection committee, although a paper need not be nominated to win an award. You can nominate a paper using this form until February 4, 2019.
For the 2019 award, papers published in the 3 IACR General Conferences of 2004 are eligible. The proceedings of these conferences can be found here: