单词 | digital signature | |||||||||
释义 | digital signaturedigital signaturedigital signaturedigital signaturedigital signature[′dij·əd·əl ′sig·nə·chər]digital signature(cryptography)The sender uses a one-way hash function to generate ahash-code of about 32 bits from the message data. He thenencrypts the hash-code with his private key. The receiverrecomputes the hash-code from the data and decrypts thereceived hash with the sender's public key. If the twohash-codes are equal, the receiver can be sure that data hasnot been corrupted and that it came from the given sender. digital signatureA digital signature is the electronic equivalent of a person's physical signature. It is also a guarantee that information has not been modified, as if it were protected by a tamper-proof seal that is broken if the contents were altered.Signed Certificates Digitally signed certificates verify the identity of an organization or individual. Signed certificates are widely used to authenticate a website and establish an encrypted connection for credit cards and confidential data (see digital certificate, SSL and TLS). Signed Files Files of any kind can be signed; however, a common application is "code signing," which verifies the integrity of executables downloaded from the Internet. Code signing also uses certificates (see code signing and digital certificate). An Encrypted Digest A digital signature is actually an encrypted digest of the data being signed. The digest is computed from the contents of the file by a one-way hash function (see below) and then encrypted with the private key of the signer's public/private key pair. To prove that the file was not tampered with, the recipient uses the public key of the signer to decrypt the signature back into the original digest, recomputes a new digest from the transmitted file and compares the two to see if they match. If they do, the file has not been altered in transit by an attacker. See RSA, MD5, SHA, public key cryptography and electronic signature.
With and Without PrivacyThe following two diagrams show how digital signatures are used for data integrity in both non-private and private transmissions.
digital signaturedigital signatureAn electronic signature based on cryptographic rules and parameters of originator authentication, which identify the signer and verify the integrity of the data pertaining to the signature.digital signatureSee DSIG |
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