The best replacement for 509 is 609.

The best alternatives to 509 are rated as following:
★★★★★  609
★★★★  afx
★★★  denon 1612
★★★  pgp
★★  414
★★  yamaha 471
★  501
★  608
★  609 onkyo
★  pkcs #7
★  526
★  1009
  509.2
  pkcs
  579

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509
609
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