C. in what ways can a hash value be secured so as to provide message authentication?
1.In what ways can a hash value be secured so as to provide message authentication? Task: Answer the question above. Follow APA guidelines. Must use at least two references and citations
APA 321 words Get instant access to the full solution from yourhomeworksolutions by clicking the purchase button belowOfficial: - Second preimage resistance (weak collision resistance): it is computationally infeasible to find any second input which has the same output as that of a specified input, i.e., given x, it is difficult to find a second preimage x′ ≠ x such that h(x) = h(x′). - (Strong) collision resistance: It is computationally infeasible to find any pair (x, y) such that H(x) = H(y), i.e. district inputs. With preimage attack, you already know one X. With collision resistance, you have more freedom, for you need to find any pair that matches. Brute-force preimage and second preimage attacks require 2n effort, while a collision attack only requires 2n/2 effort (i.e., due to the birthday paradox) for a hash code of length n. This is because the more variations there, i.e. the more people there are in a room, the higher the changes that two people will have the same birthday. Homework Help Course Hero uses AI to attempt to automatically extract content from documents to surface to you and others so you can study better, e.g., in search results, to enrich docs, and more. This preview shows page 1 - 2 out of 3 pages.
1.In what ways can a hash value be secured so as to provide message authentication? Get answer to your question and much more Upload your study docs or become a Course Hero member to access this document Upload your study docs or become a Course Hero member to access this document End of preview. Want to read all 3 pages? Upload your study docs or become a Course Hero member to access this document Tags Cryptography, hash function, Cryptographic hash function, hash code Newly uploaded documentsNewly uploaded documentsHash-based Message Authentication Code (HMAC) is a message authentication code that uses a cryptographic key in conjunction with a hash function. Hash-based message authentication code (HMAC) provides the server and the client each with a private key that is known only to that specific server and that specific client. The client creates a unique HMAC, or hash, per request to the server by hashing the request data with the private keys and sending it as part of a request. What makes HMAC more secure than Message Authentication Code (MAC) is that the key and the message are hashed in separate steps. HMAC(key, msg) = H(mod1(key) || H(mod2(key) || msg)) This ensures the process is not susceptible to extension attacks that add to the message and can cause elements of the key to be leaked as successive MACs are created. Once the server receives the request and regenerates its own unique HMAC, it compares the two HMACs. If they're equal, the client is trusted and the request is executed. This process is often called a secret handshake. This was last updated in November 2010 Next StepsThe spate of credit card breaches of major retailers demand more advanced cryptography standards to protect credit card holders. The Payment Card Industry Data Security Standard (PCI DSS) requires merchants to encrypt specific card holder information. Understanding the choice of encryption methods such as hashing, public-private key and others is a high priority towards ensuring retailers don’t get breached. Learn more about authentication, and get started by reading a primer on multifactor authentication in the enterprise. Then read our comparison of MFA tools to get the inside scoop on the product landscape. Continue Reading About Hash-based Message Authentication Code (HMAC)
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How can a hash function be used as a message authentication code?Hash-based Message Authentication Code (HMAC) is a message authentication code that uses a cryptographic key in conjunction with a hash function. Hash-based message authentication code (HMAC) provides the server and the client each with a private key that is known only to that specific server and that specific client.
Can hash be used for authentication?Hashing is a cryptographic process that can be used to validate the authenticity and integrity of various types of input. It is widely used in authentication systems to avoid storing plaintext passwords in databases, but is also used to validate files, documents and other types of data.
How does a simple hash function provide authentication?The hash code is encrypted, using public-key encryption with the sender's private key. As with Figure b, this provides authentication. It also provides a digital signature, because only the sender could have produced the encrypted hash code. In fact, this is the essence of the digital signature technique.
Which are the 3 security requirements that a secure hash functions should satisfy?Data Encryption
A cryptographic hash function must satisfy three criteria: Preimage resistance. Second preimage resistance (weak collision resistance) Strong collision resistance.
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