Electronic contracts signed using an excellent third-party electronic contract platform can use relevant technologies to ensure that the contract is not tampered with. This is the basis for ensuring that the electronic contract has legal validity. The core technology to ensure that it is not tampered with is digital signature technology.

The use of digital signatures can ensure that the sender cannot deny or forge the information, which is a security measure.

In public key cryptography, a key is a key pair consisting of a public key and a private key. A digital signature uses a private key to encrypt, and the recipient uses a public key to decrypt. Since the public key cannot deduce the private key, the public key does not compromise the security of the private key. The public key does not need to be kept secret and can be disseminated publicly, while the private key must be kept secret.

Therefore, when someone encrypts a message with his or her private key and can decrypt it correctly with his or her public key, it is certain that the message was signed by someone, because it is impossible for someone else's public key to decrypt it. If the encrypted information is correctly decrypted, it is impossible for others to possess the person's private key and create the encrypted information.

In essence, digital signature is a security measure that the recipient can take to prove to a third party the authenticity of the received message and the sending source. Its use can ensure that the sender cannot deny and False information.

The main method of digital signature is: the sender of the message generates a hash value (or message digest) from the message text, and the sender uses its own private key to process the hash value Encrypted to form a digital signature of the sender, this digital signature will then be sent to the recipient of the message as an attachment to the message. The recipient of the message first calculates the hash value from the original message received. (or message digest), and then use the sender's public key to decrypt the digital signature attached to the message. If the two hash values ??are the same, then the receiver can confirm that the digital signature belongs to the sender.

In short, with digital signature technology, electronic contracts are more difficult to tamper with than traditional paper contracts.