The birthday attacks are called so because we can only have 365 birthdays (oh well, excluding 2/29). So, if there are 366 people in a place at least two of them have the same birthday - thus causing collision(s). Same things happens in hash algorithm. The people in birthday attack is the same thing as:. 1. hash in the hash algorithm. 2. input in the hash algorithm. 3. the algorithm in hash algorithm. 4. the key

2. input in the hash algorithm

In a hash algorithm, a function called hash function (say H) is chosen to transform a variable sized input n, and return a fixed size string called the hash value (say h). i.e

H(n) => h

Comparing this to the birthday attacks;

i. the hash function is getting the people's birthdays - H,

ii. the input is each person in the group of people - n,

iii. the hash is the value of the birthday of each person - H(n).

assuming you are in the home page.

1) go to the upper right hand corner

2) click on your "profile picture"

3) go down to "edit profile"

4) it should be titled as "edit your profile", click on "profile picture"

5) choose a file

6) press "change"

you're profile picture is updated

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we need a link or picture : )