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Im thinking of schemes like onion encryption, IBE, ABE, Blind Signatures.

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    This question isn't super clear as it is currently stated, or I'm not reading correctly. A third party is necessary to validate or prove the authenticity of those involved in an asymmetric encryption scheme, but you can use many asymmetric schemes without any third parties. – INV3NT3D Oct 19 '16 at 17:57
  • thanks. For instance in group based signature scheme is the group manager a third party? Is a third party any entity responsible for verifying the signatures? – eternalStud Oct 19 '16 at 19:42
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No. Asymmetric encryption works between just two people. A trusted third party is generally used to validate public keys.

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  • I think most of the applications nowadays don't use 3rd party for validation at all. Their developers store the self-signed root certificate in the client app and use it for authenticity just like your browser does. Is it correct? – defalt Oct 20 '16 at 5:34
  • HTTPS for browsers all rely on 3rd parties so this is definitely common – d1str0 Oct 20 '16 at 19:09

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