How and when do I use HMAC? - Information Security Stack …
2015年5月31日 · HMAC relies on symmetric key cryptography and pre-shared secrets instead of private/public pairs. The downside is the same as with symmetric key cryptography in general …
What is the difference between MAC and HMAC?
2017年4月13日 · HMAC is a recipe for turning hash functions (such as MD5 or SHA256) into MACs. So HMAC-MD5 and HMAC-SHA256 are specific MAC algorithms, just like QuickSort is …
How to decide whether to use digital signature (RSA) or HMAC
2019年8月11日 · From my perspective HMAC should be used as we only want to check that the first entity is a known one. Furthermore HMAC can be faster than RSA ( openssl speed hmac …
Salted hashes vs HMAC? - Information Security Stack Exchange
2013年1月30日 · An HMAC incorporates additional secret data in the form of a key. This key is combined with the message in a much deeper way than a salt, and may be used in addition to …
What's the difference between HMAC-SHA256(key, data) and …
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 …
When do I need to use CBC and HMAC? - Cryptography Stack …
2018年8月13日 · The choice between CBC-MAC and HMAC depends on context. Using HMAC is the least tricky, but CBC-MAC can make sense if speed (especially for short messages) or …
Use cases for CMAC vs. HMAC? - Cryptography Stack Exchange
2014年4月22日 · HMAC was there first (the RFC 2104 is from 1997, while CMAC is from 2006), which is reason enough to explain its primacy. If you use HMAC, you will more easily find test …
HMAC Key Sizes for MD5, SHA1, SHA224|256|384|512
However, I also can't find any RFC which actually states this. Neither RFC5246 (which acknowledges HMAC-SHA384 and HMAC-SHA512 as potential MAC algorithms, but doesn't …
What size should the HMAC key be with SHA-256?
2015年12月23日 · Short answer: 32 bytes of full-entropy key is enough. Assuming full-entropy key (that is, each bit of key is chosen independently of the others by an equivalent of fair coin …
When, where, and how to use HMAC - Cryptography Stack Exchange
Indeed, in their book HMAC is applied in the context of how to implement a secure channel so that clients that need secure communications don't have to think about HMAC (or nonce reuse or …