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Charlie

Contributor

Registered: 2017-01-27

Posts: 129

Execution times - hf mf chk, hf mf fchk and script run mfkeys -

I was doing a speed comparison on a mifare card today and found the following total execution times interesting.

1. hf mf chk *1 ?  d default_keys.dic             - 224 sec
2. hf mf fchk *1 ?  d default_keys.dic            - 238.1 sec
3. script run mfkeys                                     - 317 sec

anyone else find "hf mf chk" faster than "hf mf fchk"?

pm3 -->script run mfkeys

Do you wish to save the keys to dumpfile? [y/n] ?n
mfkeys - Total execution time: 317 sec

[+]Finished

pm3 --> hf mf chk *1 ?  d default_keys.dic
Loaded 475 keys from default_keys.dic
.................................................................................................................
e in checkkeys: 224 seconds

testing to read key B...
|---|----------------|---|----------------|---|
|sec|key A           |res|key B           |res|
|---|----------------|---|----------------|---|
|000|  ffffffffffff  | 1 |  ffffffffffff  | 1 |
|001|  ------------  | 0 |  ------------  | 0 |
|002|  ------------  | 0 |  ------------  | 0 |
|003|  ------------  | 0 |  ------------  | 0 |
|004|  ------------  | 0 |  ------------  | 0 |
|005|  ------------  | 0 |  ------------  | 0 |
|006|  ------------  | 0 |  ------------  | 0 |
|007|  ------------  | 0 |  ------------  | 0 |
|008|  ------------  | 0 |  ------------  | 0 |
|009|  ------------  | 0 |  ------------  | 0 |
|010|  ------------  | 0 |  ------------  | 0 |
|011|  ------------  | 0 |  ------------  | 0 |
|012|  ------------  | 0 |  ------------  | 0 |
|013|  ------------  | 0 |  ------------  | 0 |
|014|  ffffffffffff  | 1 |  ffffffffffff  | 1 |
|015|  ffffffffffff  | 1 |  ffffffffffff  | 1 |
|---|----------------|---|----------------|---|
Printing keys to binary file hf-mf-75FBE92E-key.bin...
Found keys have been dumped to file hf-mf-75FBE92E-key.bin. 0xffffffffffff has been inserted for unknown keys.

pm3 --> hf mf fchk *1 ?  d default_keys.dic
Loaded 475 keys from default_keys.dic

Running strategy 1
.................[-] Chunk: 34.5s | found 6/32 keys (85)

.[-] Chunk: 2.8s | found 6/32 keys (85)

.[-] Chunk: 2.8s | found 6/32 keys (85)

.[-] Chunk: 2.8s | found 6/32 keys (85)

.[-] Chunk: 2.8s | found 6/32 keys (85)

[-] Chunk: 1.7s | found 6/32 keys (50)

Running strategy 2
.................[-] Chunk: 34.5s | found 6/32 keys (85)

.................[-] Chunk: 34.0s | found 6/32 keys (85)

.................[-] Chunk: 34.0s | found 6/32 keys (85)

................[-] Chunk: 34.0s | found 6/32 keys (85)

................[-] Chunk: 34.0s | found 6/32 keys (85)

..........[-] Chunk: 20.1s | found 6/32 keys (50)
|---|----------------|---|----------------|---|
|sec|key A           |res|key B           |res|
|---|----------------|---|----------------|---|
|000|  ffffffffffff  | 1 |  ffffffffffff  | 1 |
|001|  ------------  | 0 |  ------------  | 0 |
|002|  ------------  | 0 |  ------------  | 0 |
|003|  ------------  | 0 |  ------------  | 0 |
|004|  ------------  | 0 |  ------------  | 0 |
|005|  ------------  | 0 |  ------------  | 0 |
|006|  ------------  | 0 |  ------------  | 0 |
|007|  ------------  | 0 |  ------------  | 0 |
|008|  ------------  | 0 |  ------------  | 0 |
|009|  ------------  | 0 |  ------------  | 0 |
|010|  ------------  | 0 |  ------------  | 0 |
|011|  ------------  | 0 |  ------------  | 0 |
|012|  ------------  | 0 |  ------------  | 0 |
|013|  ------------  | 0 |  ------------  | 0 |
|014|  ffffffffffff  | 1 |  ffffffffffff  | 1 |
|015|  ffffffffffff  | 1 |  ffffffffffff  | 1 |
|---|----------------|---|----------------|---|
Printing keys to binary file default_keys.dic...
Found keys have been dumped to file default_keys.dic. 0xffffffffffff has been inserted for unknown keys.

[+]Time in checkkeys (fast): 238.1s

iceman

Administrator

Registered: 2013-04-25

Posts: 9,537

Website

Re: Execution times - hf mf chk, hf mf fchk and script run mfkeys -

yes,  I did.
There are some search cases in which chk is faster than fchk.  In most search cases its the opposite.

Not that it matters, but you are using the wrong parameters for fchk.