![]() ![]() Using today's technology, it is not feasible to discover a pair of messages that translate to the same hash value without breaking the hashing algorithm. ![]() Every pair of non-identical messages translates into a completely different hash value, even if the two messages differ only by a single bit.The most common hash value lengths are either 128 or 160 bits. The length of the hash value is determined by the type of algorithm used, and its length does not vary with the size of the message.A number of these algorithms are listed later in this section.Īll hash values share the following properties, regardless of the algorithm used: This is produced by using a hashing algorithm. The following diagram illustrates the process involved in verifying a digital signature.Ī hash value consists of a small amount of binary data, typically around 160 bits. If the hash value and the signature match, you can be confident that the message is indeed the one the signer originally signed and that it has not been tampered with. This hash value is then verified against the signature by using the public key of the signer. First, a hash value must be created from the message in the same way the signature was created. ![]() To verify a signature, both the message and the signature are required. The following is an illustration of the steps involved in creating a digital signature. This hash value is then signed, using the signer's private key. The first step involves creating a hash value (also known as a message digest) from the message. There are two steps involved in creating a digital signature from a message. This process is shown in the following illustration. A private key generates the signature, and the corresponding public key must be used to validate the signature. ![]() Decrypting the signature data using the sender's public key proves that the data was encrypted by the sender or by someone who had access to the sender's private key.ĭigital signatures are generated by using public key signature algorithms. A digital signature is a short piece of data that is encrypted with the sender's private key. Signing a message does not alter the message it simply generates a digital signature string you can either bundle with the message or transmit separately. Digital signatures can be used to distribute a message in plaintext form when the recipients must identify and verify the message sender. ![]()
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