[cheerlessbog]

Or use modified randomized response technique [1]

Roll a die and multiply (salary - 100k) by the spots on the die. Share that value publicly. Sum all such values and average them then divide by 21/6 and add 100k. Choose the 100k value to be closest to but not greater then your guess at the lowest salary.

[1] https://en.m.wikipedia.org/wiki/Randomized_response