Ask HN: Which 2 way encryption method is this?

https://news.ycombinator.com/item?id=854248

by Syama • 17 years ago

3 2 17 years ago

news.ycombinator.com

which 2 way encryption method is this?

encrypted KWcClMPHGsHWy6o8VV1/2I3zv8pENqfujwb3PFHG8sU=

unencrypted 4301542003347407

bdfh42• 17 years ago

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

mbrubeck• 17 years ago

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.........<U]..|
    00000010  8d f3 bf ca 44 36 a7 ee  8f 06 f7 3c 51 c6 f2 c5  |....D6.....<Q...|

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.

Ask HN: Which 2 way encryption method is this?

Related Stories