The main difference is conceptual: while hashes are used to guarantee the integrity of data, a MAC guarantees integrity AND authentication. This means that a hashcode is blindly generated from the message without any kind of external input: what you obtain is something that can be used to check if the message got any alteration … Read more
As the name implies, it’s 512 bits, that is 64 bytes. But that’s the hash, maybe you’re wondering about a specific representation of that hash in string, as is commonly used, then it depends of the given representation. If you write the hash in hexa, then it will be 128 characters. If you write the … Read more
An example : import ( “crypto/sha1” “encoding/base64” ) func (ms *MapServer) storee(bv []byte) { hasher := sha1.New() hasher.Write(bv) sha := base64.URLEncoding.EncodeToString(hasher.Sum(nil)) … } In this example I make a sha from a byte array. You can get the byte array using bv := []byte(myPassword) Of course you don’t need to encode it in base64 if … Read more
Murmur is a family of good general purpose hashing functions, suitable for non-cryptographic usage. As stated by Austin Appleby, MurmurHash provides the following benefits: simple (in term of number of generated assembly instructions). good distribution (passing chi-squared tests for practically all keysets & bucket sizes. good avalanche behavior (max bias of 0.5%). good collision resistance … Read more
The input material can be an infinite length, where the output is always 128 bits long. This means that an infinite number of input strings will generate the same output. If you pick a random number and divide it by 2 but only write down the remainder, you’ll get either a 0 or 1 — … Read more
For a set of even billions of assets, the chances of random collisions are negligibly small — nothing that you should worry about. Considering the birthday paradox, given a set of 2^64 (or 18,446,744,073,709,551,616) assets, the probability of a single MD5 collision within this set is 50%. At this scale, you’d probably beat Google in … Read more
Since an MD5 sum is 128 bits long, any fixed point would necessarily also have to be 128 bits long. Assuming that the MD5 sum of any string is uniformly distributed over all possible sums, then the probability that any given 128-bit string is a fixed point is 1/2128. Thus, the probability that no 128-bit … Read more
The use of “closed” vs. “open” reflects whether or not we are locked in to using a certain position or data structure (this is an extremely vague description, but hopefully the rest helps). For instance, the “open” in “open addressing” tells us the index (aka. address) at which an object will be stored in the … Read more
32 chars as hexdecimal representation, thats 2 chars per byte.
Try: hg id -i Example: $ hg id -i adc56745e928