Patent ID: 10979218

Abstract:
An example operation may include one or more of sending, by an administrator node, an encrypted random value adm1 to the participant node 1, wherein the adm1 is encrypted by a public key PK=PK_adm+PK1, wherein the PK_adm is a public key of the administrator node and the PK1 is a public key of the participant node 1, receiving, by an administrator node, a secret S1 from the participant node 1, wherein the S1 is a random value encrypted by the PK, storing, by an administrator node, a secret S=(S1+adm1) encrypted by the PK, sending, by an administrator node, an encrypted value (S+adm2′−adm2) by the PK1 and a PK2 to the participant node 1 to be decrypted, wherein the adm2′ and the adm2 are random values and the PK2 is a public key of a participant node 2, and in response to a confirmation that the participant node 1 has sent the (S−adm2+adm2′) encrypted by the PK2 to the participant node 2, sending, by an administrator node, the adm2′ to the participant node 2 to compute a secret S2.