201307231045 1iwqql
partial decrypted manual
A coordinate, a date and a token. 3DES-CBC, key MD5(name), first block lost. Open: what the numbers mean.
From the post to its content
As posted (encrypted)
24741E01EF0F6188 791496FE4C9B7525 BCDBBC3B229C863E 6B261AFF816882C5 644AB3D62429C79B 8016FCDE0885F49D 3A45536528168AE9
- Derive the key. Password =
A858DE45F56D9BC9(name); key = MD5(password) =34a14a42e98ff96095af56604e290cae, used as a two-key 3DES key. - Decrypt. 3DES-EDE2 in CBC mode, then strip the PKCS7 padding.
- Lost block. The IV was never published, so the first 8 bytes are not recovered (shown as
????????). Every later block decrypts exactly.
Decrypted
????????2,31.247195
2013-07-25
13:00:20
NfA33u8*
Explanation
Solution summary
- Method
- 3DES-CBC, key MD5(name), IV not recovered
- Result
- 2,31.247195 / 2013-07-25 / 13:00:20 / NfA33u8*
- Explanation
- First block lost; the rest is a coordinate, date and token
- Re-checked
- 3DES-CBC MD5(name), IV lost