Swr Zb: Ynyk Ks

The phrase appears to be an encoded message using a shift cipher (Caesar cipher).

However, the most common simple cipher in puzzles is (shift +1) or ROT-1 (shift -1). Let's also try ROT-1 with a different starting assumption: swr zb ynyk ks

Given the format, this is likely a resulting in r v q y a x m x j j r — which could be an anagram or intended as a test. The phrase appears to be an encoded message