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digital signature in network security

The miniature version (digest) of the message is created by using a hash function. If the message is long, a public key encryption is inefficient to use. When the receiver receives the message on its end it will decrypt the message shared by the sender using the sender’s public key and the receiver’s private key. 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A hash function must have two properties to ensure the success: First, the digest must be one way, i.e., the digest can only be created from the message but not vice versa. Through the use of encryption verification technology, known as Public Key Infrastructure (PKI), a digital signature offers the highest and most verifiable standard for identifying an individual by an electronic signature. A Digital signature is a one-way hash, of the original data, that has been encrypted with the signer’s private key. The DSA algorithm consists of a private key that only the originator of the document (signer) knows and a public key. Public-key encryption is efficient if the message length is small. In Digital Signature, the private key is used for encryption while the public key is used for decryption. In DSA, a pair of numbers is created and used as a digital signature. Digital certificate is a file that ensures holder’s identity and provides security. This algorithm provides the private key and its corresponding public key. 2. The hashing and the message should have a one-to-one correspondence. A digital signature is a mathematical scheme for verifying the authenticity of digital messages or documents. Using a public key algorithm, such as RSA, one can generate two keys that are mathematically linked: one private and one public. In the real physical world, the authenticity of a document is verified by the signature of the sender that is called Digital Signature. It also includes authentication function for additional capabilities. Public key encryption is efficient if the message is short. The two most common hash functions used: MD5 (Message Digest 5) and SHA-1 (Secure Hash Algorithm 1). The encrypted digest is attached to the original message and sent to the receiver. ii. This message digest, which is much shorter in length than the message, is encrypted using private key of the sender (A). The basic idea behind the Digital Signature is to sign a document. The idea is similar to the signature in a physical document. In Digital Signature, a public key encryption technique is used to sign a document. However, the roles of a public key and private key are different here. Digital signatures are kind of like electronic versions of your handwritten signatures. A. conventional; digital B. digital; digital C. either (a) or (b) D. neither (a) nor (b) 2. The Digital Signature Standard (DSS) is based on a type of public key encryption method that uses the Digital Signature Algorithm (DSA). A digital signature is a mathematical scheme for demonstrating the authenticity of digital messages or documents. When we send a document electronically, we can also sign it. Integrity: The Integrity of the message is preserved because if an eve intercepted the message and modified the whole or part of it, the receiver after decryption will get a meaningless message and take necessary action. 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