The best replacement for des is 3des.

The best alternatives to des are rated as following:
★★★★★  3des
★★★★  les
★★★★  aes
★★★  bms
★★  de
★★  desu
★★  rsa
★★  md5
★  les french
★  fob
★  aes encryption
★  proin
★  desede
★  rc4
★  diethylstilbestrol
  igf lr3
  triple des
  sha
  blowfish
  quelques
  nutcracker esophagus
  cabg
  des
  bare metal stent
  igf-1 lr3

Your alternative for des is not listed? Suggest!
Speaking about des, one probably shouldn't forget about ptca.

Other search terms related to des and their ratings are:
★★★★★ ptca
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des
3des
les