Keys: Does the primitive require a shared secret key, or public-private keypairs? Non-repudiation: If the recipient passes the message and the proof to a third party, can the third party be confident that the message originated from the sender? (Please note that I am talking about non-repudiation in the cryptographic sense, not in the legal sense.)
![macbook encryption algorithm macbook encryption algorithm](https://tipsmake.com/data/images/what-is-mac-os-x-filevault-and-how-to-use-it-picture-3-5QAcgWFef.jpg)
Integrity: Can the recipient be confident that the message has not been accidentally modified?Īuthentication: Can the recipient be confident that the message originates from the sender? These types of cryptographic primitive can be distinguished by the security goals they fulfill (in the simple protocol of "appending to a message"): However, the Devil is in the details.įound this to the point answer from another forum.
MACBOOK ENCRYPTION ALGORITHM MAC
To some extent, we can state that a MAC algorithm which can operate securely without an IV must exhibit some hash-like properties (that's the reason I like HMAC: without an IV, it is much harder to get it wrong when implementing it). Indeed, security properties and models for hash functions and MAC are sufficiently distinct from each other that slapping a hash function and a key together does not necessarily yield a secure MAC, even if the hash function is secure (see the length extension attack which illustrates that point). HMAC is a well-known MAC construction, which itself builds on an underlying hash function in a smart way. Some MAC algorithms (but certainly not all of them) can be thought of as "hash functions with a key" but this is a restrictive view. Hash functions and MAC are thus distinct kind of algorithms with distinct properties and used in really distinct situations. What we expect from a good MAC is unforgeability: it should be infeasible to compute a pair message+MAC value which successfully verifies with a given key K without knowing K exactly and in its entirety. Contrary to hash functions where everything is known and attackers are fighting against mathematics, MAC make sense in models where there are entities with knowledge of a secret.
MACBOOK ENCRYPTION ALGORITHM VERIFICATION
Good cryptographic hash functions respect some conditions which boil down to, informally, that they mix input data so thoroughly that we cannot figure it out afterwards.Ī message authentication code is an algorithm which takes as input a message and a secret key and produces a fixed-sized output which can be later on verified to match the message the verification also requires the same secret key. always 160 bits with the standard hash function SHA-1). It takes as input a sequence of bits (any sequence of bits some hash functions are formally limited to inputs of, say, less 2 64 bits, aka "2 millions of terabytes") and outputs values in a rather small space, typically a sequence of bits with a fixed size (e.g.
![macbook encryption algorithm macbook encryption algorithm](https://www.cisdem.com/resource/attach/file/images/veracrypt.png)
A cryptographic hash function is a completely public, deterministic hash function which everybody can compute over arbitrary inputs.