Abstract: A method for performing Building Information Modelling design collaboration via Confidentiality-Minded Framework using Interplanetary-File-System-Blockchain integrated network by a server is provided. The method includes: segregating one or more sensitive and non-sensitive BIM portions of a BIM object; uploading a target BIM component into an IPFS network to receive a target content identifier (CID) of the target BIM component from the IPFS network; if the target BIM component has one or more of the sensitive portions, encrypting the target CID to obtain a target encrypted CID (ECID), and adding the target ECID into a target blockchain ledger as a target transaction via a target smart contract; accessing the target transaction to download the target BIM component from the IPFS network; and performing a design coordination operation on the target BIM component, so as to distributing revised target BIM component to a receiver terminal.

Abstract: A system for cost management using blockchain and encryption is provided. The system includes an access interface, a recorder, a determinator, a key generator, an encryptor, and a decryptor. The access interface is configured to provide a platform for users to log in. The recorder is for recording cost information. The determinator is configured to determine whether the cost information recorded in the recorder is non-sensitive. When the cost information is determined as being non-sensitive, the cost information is directly uploaded to and recorded on a blockchain network via a smart contractor module. When the cost information is determined as being sensitive, the key generator generates a symmetric key randomly. The encryptor is configure to encrypt the cost information using the symmetric key to obtain ciphertext information and encrypt the symmetric key using public keys to obtain encrypted keys. The encryptor sends the ciphertext information to the blockchain network.

Abstract: A method for performing Building Information Modelling design collaboration via Confidentiality-Minded Framework using Interplanetary-File-System-Blockchain integrated network by a server is provided. The method includes: segregating one or more sensitive and non-sensitive BIM portions of a BIM object; uploading a target BIM component into an IPFS network to receive a target content identifier (CID) of the target BIM component from the IPFS network; if the target BIM component has one or more of the sensitive portions, encrypting the target CID to obtain a target encrypted CID (ECID), and adding the target ECID into a target blockchain ledger as a target transaction via a target smart contract; accessing the target transaction to download the target BIM component from the IPFS network; and performing a design coordination operation on the target BIM component, so as to distributing revised target BIM component to a receiver terminal.