Peel the daikon and cut it into 2 × ½-inch-thick (5 cm × 13 mm) sticks. Put in a medium bowl and coat with ½ teaspoon of the salt. Let sit for 1 hour to release the water.
In another medium bowl, mix together the remaining ½ teaspoon salt, vinegar, and sugar. Lightly squeeze the water out of the daikon and toss with the vinegar mixture.