The best replacement for 3des is aes.

The best alternatives to 3des are rated as following:
★★★★★  aes
★★★★  des
★★★  rc4
★★★  rsa
★★  blowfish
★★  md5
★★  sha1
★  rc2
★  aes performance
★  aes 256
★  sha
★  aes 128
★  aes128
★  aes which is better
★  3des-cbc
★  aes encryption
★  aes vpn
  rijndael
  aes ipsec
  aes-128
  aes cisco
  128 aes
  aes256

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Speaking about 3des, one probably shouldn't forget about rsa.

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