The CHES Test-of-Time Award is given yearly. An award will be given in year X to honor a paper published at (T)CHES in years X-21 to X-19 which has had a lasting impact on the field with respect to academia and/or industry.
More information about the Test-of-Time award can be found in the policy guidelines document.
The CHES 2022 Test of Time Award has been awarded to Suresh Chari, Josyula R. Rao, and Pankaj Rohatgi for the paper Template Attacks, published at CHES 2002.
A recording of the Award Ceremony is available here.