System and method for information protection

A non-transitory computer-readable storage medium storing instructions that, when executed by a processor, cause the processor to perform operations comprising:

• committing a transaction amount t of a transaction with a first commitment scheme to obtain a transaction commitment value T, and committing a change y of the transaction with a second commitment scheme to obtain a change commitment value Y, the first commitment scheme comprising a transaction blinding factor rt, and the second commitment scheme comprising a change blinding factor ry;
• encrypting a first combination of the change blinding factor ry and the change y with a first key KA;
• transmitting the transaction blinding factor rt, the transaction amount t, and the transaction commitment value T to a recipient node associated with a recipient of the transaction for the recipient node to verify the transaction;
• in response to that the recipient node successfully verifies the transaction, obtaining an encrypted second combination of the transaction blinding factor rt and the transaction amount t encrypted with a second key KB;
• and
• transmitting the encrypted first combination and the encrypted second combination to a plurality of nodes in a blockchain for the nodes in the blockchain to verify the transaction.

A computer-implemented method for information protection, comprising:

• obtaining a transaction blinding factor rt, a transaction amount t of a transaction, and a transaction commitment value T from a sender node associated with a sender of a transaction, wherein:
• the transaction amount t is committed with a first commitment scheme to obtain the transaction commitment value T, the first commitment scheme comprising the transaction blinding factor rt;
• verifying the transaction based on the obtained transaction blinding factor rt, the obtained transaction amount t of a transaction, and the obtained transaction commitment value T;
• in response to successfully verifying the transaction, encrypting a second combination of the transaction blinding factor rt and the transaction amount t encrypted with a second key KB;
• and
• transmitting the encrypted second combination to the sender node.