Document tamper detection and verification using MD5 hashing algorithm and digital signature approach for online construction bidding System.

COMPUTER ENGINEERING

In an online bidding system the bidder bid for the best deal. The documents shared are in electronic format and that leaves lot of scope for document tampering. Electronic files are typically shared by disc or download link using the honour system. Once these files have been dispersed, anyone can modify the contents to fit their narrative, and then distribute that version as an official exhibit. Such changes can be difficult or impossible to trace to their source due to the number of people with access to the files. To prevent this we will use MD5 with Digital Signature Standardization algorithm. We can identify each file by its unique Hash value and then use that identifier to ensure file integrity once file sharing has begun. In this system MD5(Message Digest 5) algorithm is used as a cryptographic hash function. MD5 hash is composed of 32 hexadecimal characters. Along with this digital signature approach(Digital Signature Standardization Algorithm) is used for verification Based on hash value calculations at sender and receiver side conclusion can be drawn whether document has been tampered with or not.

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