How and when do I use HMAC? - Information Security Stack Exchange
I was reading HMAC on wikipedia and I was confused about a few points. Where do I use HMAC? Why is the key part of the hash? Even if someone successfully used a "length-extension attack", how …
What is the difference between MAC and HMAC?
Note that HMAC is a specific scheme as Seth correctly describes; SHA-3 uses KMAC which is therefore another hash based MAC. Maybe the acronyms CBMAC and HBMAC could be used for Cipher …
HMAC and integrity - Information Security Stack Exchange
2019年11月6日 · All resources that I found online, say only that HMAC guarantee integrity, but I don't understand in what way. I founded this answear here and I understand this : If Alice sends the file …
hash - HMAC-SHA1 vs HMAC-SHA256 - Cryptography Stack Exchange
I have three questions: Would you use HMAC-SHA1 or HMAC-SHA256 for message authentication? How much HMAC-SHA256 is slower than HMAC-SHA1? Are the security improvements of SHA256 …
What's the difference between HMAC-SHA256 (key, data) and SHA256 …
2015年1月20日 · Then HMAC is defined as: HASH(Key XOR opad, HASH(Key XOR ipad, text)) or, in detail from the RFC, (Pretext: The definition of HMAC requires a cryptographic hash function, which …
How to calculate a hmac and cmac - Cryptography Stack Exchange
2021年4月2日 · hmac = hash(key, message) The difference seems to be that cmacs are using a symmetric encryption additional to the hash-function while hmacs process the key within the hash …
Use cases for CMAC vs. HMAC? - Cryptography Stack Exchange
2014年4月22日 · Use cases for CMAC vs. HMAC? Ask Question Asked 11 years, 8 months ago Modified 5 years, 8 months ago
key generation - What are requirements for HMAC secret key ...
2015年8月5日 · HMAC user-input keys that are longer than the specific hash algorithms blocksize are first shortened. (By running the long keys through the hash. And then using that hash as the actual …
What is the difference between a HMAC and a hash of data?
Please note that "HMAC" is a specific construction of a MAC (from a hash function), and most of your description applies to MACs in general. If we use HMAC-SHA3 or HMAC-SHA512-384, the length …
collision resistance - Why is HMAC-SHA1 still considered secure ...
That said, the construct of HMAC-SHA1 is still considered safe to use (assuming a secret key) due to the security proof for HMAC which does not rely on collision resistance of the underlying PRF.