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Algorand Specifications

OneTimeSignatureSubkeyBatchID identifies an intermediate level ephemeral sub-key of a batch and is signed by the voting key’s root key. It has the following fields:

• Sub-Key Public key (SubKeyPK), the public key of this sub-key.

• Batch (Batch), batch number of this sub-key.

The OneTimeSignatureSubkeyOffsetID identifies a leaf-level ephemeral sub-key and is signed with a batch sub-key. It has the following fields:

• Sub-Key Public key (SubKeyPK), the public key of this sub-key.

• Batch (Batch), batch number of this sub-key.

• Offset (Offset), offset of this sub-key in current batch.

Finally, OneTimeSignature is a cryptographic signature used in voting messages between Algorand players. It contains the following fields:

• Signature (Sig), a signature of message under PK.

• Public Key (PK), the public key of the message signer, is part of a leaf-level ephemeral sub-key.

• Public Key 2 (PK2), the public key of the current batch.

• Public Key 1 Signature (PK1Sig), a signature of OneTimeSignatureSubkeyOffsetID under PK2.

• Public Key 2 Signature (PK2Sig), a signature of OneTimeSignatureSubkeyBatchID under the voting keys.

The Old Style Signature (PKSigOld) is deprecated, still included in the message only for compatibility reasons.

Important

IMPLEMENTATION:

One-Time Signature reference implementation.