Ask HN: Which 2 way encryption method is this?

#1

Post by Syama » Thu, Oct 01, 2009, 3:18 AM UTC

which 2 way encryption method is this?

encrypted KWcClMPHGsHWy6o8VV1/2I3zv8pENqfujwb3PFHG8sU=

unencrypted 4301542003347407

Re: Ask HN: Which 2 way encryption method is this?

#2

Post by bdfh42 » Thu, Oct 01, 2009, 7:12 AM UTC

If it is encrypted then you will need to include the key - or do you think this is a hash?

Re: Ask HN: Which 2 way encryption method is this?

#3

Post by mbrubeck » Thu, Oct 01, 2009, 9:28 AM UTC

Whatever it is, the encrypted version is Base64-encoded. Here's a hexdump without the Base64 encoding.

    00000000  29 67 02 94 c3 c7 1a c1  d6 cb aa 3c 55 5d 7f d8  |)g.........


The decoded ciphertext is 32 bytes (256 bits), while the plaintext is 16 bytes (128 bits).  I think this suggests a 256-bit block cipher.  (Or maybe 128-bit block, especially if the input included a trailing newline or something?)  That doesn't narrow it down all that much, and if you don't have the key I'm not sure it's possible to narrow it down any further.


    
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