Tagged Questions
1
vote
2answers
66 views
How secure is passing a MAC to Python's random.seed before using random.choice to generate a MAC?
I'd like to use Python's random.choice seeded with a HMAC-SHA1 tag to generate a MAC encoded in a variable set of chars.
...
2
votes
2answers
269 views
What is the difference between MAC and HMAC?
In reference to this question, what are the "stronger security properties" that HMAC provides over MAC. I got that MAC requires an IV whereas HMAC doesn't. I also understood that MAC may reveal ...
1
vote
2answers
149 views
Deriving HMAC key and cipher key from passphrase? [duplicate]
I'm encrypting a file with AES-256 in CBC mode. I needed to add an HMAC for authentication and validation of the file contents and passphrase, so I used a SHA-256 HMAC over chunks of my file ...
-2
votes
1answer
60 views
Cryptographic Primitive Method
Is there any cryptographic primitive bijective (one-to-one and onto) function for creating cryptographic tools like symmetric encryption/decryption, Hash code generator, MAC, HMAC and Random number ...
0
votes
0answers
50 views
why these specific values used to initialize ipad & opad in HMAC [duplicate]
Possible Duplicate:
What do the magic numbers 0x5c and 0x36 in the opad/ipad calc in HMAC do?
I'm reading the book Network Security Essentials written by William Stallings.
in this book,in ...
10
votes
3answers
252 views
Purpose of outer key in HMAC
From what I know, the HMAC constructions has two strength:
It's resistant to length extensions
Since the key is consumed before the message, the attacker does not know the initial state, preventing ...
5
votes
1answer
2k views
HMAC vs MAC functions
I've read definitions of MAC and HMAC, but can't say I've completely grasped the differences.
What are principle differences?
When to use one and when the other?(Typical Use Cases)
