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Secure key issuing is variant of ID-based cryptography that reduces the level of trust that needs to be placed in a trusted third party by spreading the trust across multiple third parties. In addition to the normally transmitted information the user supplies what is known as "blinding" information which can be used to blind (hide) data so that only the user can later retrieve it. The third party provides a "blinded" partial private key, which is then passed on to several other third party in order, each adding another part of the key before blinding it and passing it on. Once the user gets the key they (and only they) can unblind it and retrieve their full private key, after which point the system becomes the same as identity based cryptography.