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I'd like to know if there is a straightfoward way to implement data
ecryption in python, like there is in say...php, with encrypt(salt,
pwd), decrypt(salt).

Basically, a way to reverse a string encrypted with md5 or sha1 etc?

Say you have a 160-bit hash that's absolutely collision resistant (not
SHA-1). How is it that a "birthday attack" would take 2**80 tries to
find a collision? The way I figure it is that pairs of hashes have to
be compared with each other, one good and one bogus, to find a
collision. Therefore you need sqrt(2**160) = 2**80 of the total
possible hashes in order to find a collision because (2**80)*(2**80) =
2**160. This seems like a combinatorics problem. How is this related
to the birthday problem?

Also is at least one collision guaranteed after 2**80 tries?

I have a old version of Freezip where I encrypted several files.
Freezip uses the standard zip encryption algorithm. But I lost and
forgot the password. Unfortunately I bought a brute-force cracker but
the key I used makes this cracker useless because the key is just too
long. This cracker is only useable for about a 6 character string
encryption key unless I have a teraflop supercomputer.

BUT... several of the files are .cpp from my programming days using
the Borland IDE. So I'm thinking that since all of these .cpp files
all begin the same way that the encryption key I used can be
determined rather easily.

By the way, I do know kinda what the key is but that's not good
enough. But I'd recognize it when I see it.

Anyway, how about it. Sounds like it could be fun for some of you.
And it would be a great relief for me.

Thanks.

jmorton123@rock dot com

Hi all,

I'm coding a simple PHP application that will store an user's session
id
as a cookie.
Since I would like to avoid dealing with the session id generation
features of PHP, I tried coming up with something quite simple.

At the beginning I thought about using a SHA-512 hash of a random
sequence of bytes.
This is the relevant code:

$randomSequence = mcrypt_create_iv(8, MCRYPT_DEV_URANDOM);
$id = hash('sha512', $randomSequence);

Now, I suppose that this is reasonably random.
At least for a site that doesn't store any financial or personal data
about its users.

In the hope of generating an even more random value, I came up with
this
code: