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#1 2019-01-14 13:31:34

masterix
Contributor
Registered: 2017-03-28
Posts: 12

T55x7 chip with semi-unknown encoding

Hi dears,

i have four t55x7 chips with and unknown encoding. I know only what official reader read.

See the screenshots below.

READ-59347.png
READ-59881.png
READ-59882.png
READ-59883.png

The only blocks that seems to change are Block 0/1 and Block 0/2.

Have you any ideas to understand how the original reader read the blocks?

Thanks

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#2 2019-01-14 13:36:22

iceman
Administrator
Registered: 2013-04-25
Posts: 9,538
Website

Re: T55x7 chip with semi-unknown encoding

Tried ?

lf search
lf search u

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#3 2019-01-14 14:25:02

masterix
Contributor
Registered: 2017-03-28
Posts: 12

Re: T55x7 chip with semi-unknown encoding

yes, tried and proxmark3 says "Valid 55x7"

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#4 2019-01-14 15:35:34

masterix
Contributor
Registered: 2017-03-28
Posts: 12

Re: T55x7 chip with semi-unknown encoding

command "lf search u" on card that original reader recognize as "59347"

Schermata-2019-01-14-alle-15-33-19.png

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#5 2019-01-14 17:13:07

iceman
Administrator
Registered: 2013-04-25
Posts: 9,538
Website

Re: T55x7 chip with semi-unknown encoding

Looks like its unknown then.   All you need to clone it is in your dumps from the first post.

Is there some printed text / numbers on the tags?  Can you share a photo front/back side?

In order to figure out the number to tag hex,  it will be easier if you posted the hex as text here...  smile

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#6 2019-01-14 17:36:58

masterix
Contributor
Registered: 2017-03-28
Posts: 12

Re: T55x7 chip with semi-unknown encoding

Tag with "59881" printed as text on card:

proxmark3> lf t55 dump
Reading Page 0:
blk | hex data | binary
----+----------+---------------------------------
  0 | 00088080 | 00000000000010001000000010000000
  1 | E66BAA21 | 11100110011010111010101000100001
  2 | 24511144 | 00100100010100010001000101000100
  3 | 11111111 | 00010001000100010001000100010001
  4 | 11111189 | 00010001000100010001000110001001
  5 | FFFFFFFF | 11111111111111111111111111111111
  6 | FFFFFFFF | 11111111111111111111111111111111
  7 | FFFFFFFF | 11111111111111111111111111111111
Reading Page 1:
blk | hex data | binary
----+----------+---------------------------------
  0 | 00088080 | 00000000000010001000000010000000
  1 | E0150A78 | 11100000000101010000101001111000
  2 | 5EEC9FC3 | 01011110111011001001111111000011
  3 | FFFFFFFF | 11111111111111111111111111111111

Tag with "59882" printed as text on card:

proxmark3> lf t55 dump
Reading Page 0:
blk | hex data | binary
----+----------+---------------------------------
  0 | 00088080 | 00000000000010001000000010000000
  1 | E66BAA31 | 11100110011010111010101000110001
  2 | 24511134 | 00100100010100010001000100110100
  3 | 11111111 | 00010001000100010001000100010001
  4 | 11111189 | 00010001000100010001000110001001
  5 | FFFFFFFF | 11111111111111111111111111111111
  6 | FFFFFFFF | 11111111111111111111111111111111
  7 | FFFFFFFF | 11111111111111111111111111111111
Reading Page 1:
blk | hex data | binary
----+----------+---------------------------------
  0 | 00088080 | 00000000000010001000000010000000
  1 | E0150A78 | 11100000000101010000101001111000
  2 | 5EEC9A5C | 01011110111011001001101001011100
  3 | FFFFFFFF | 11111111111111111111111111111111

Tag with "59883" printed as text on card:

proxmark3> lf t55 dump
Reading Page 0:
blk | hex data | binary
----+----------+---------------------------------
  0 | 00088080 | 00000000000010001000000010000000
  1 | E66BAA41 | 11100110011010111010101001000001
  2 | 24511124 | 00100100010100010001000100100100
  3 | 11111111 | 00010001000100010001000100010001
  4 | 11111189 | 00010001000100010001000110001001
  5 | FFFFFFFF | 11111111111111111111111111111111
  6 | FFFFFFFF | 11111111111111111111111111111111
  7 | FFFFFFFF | 11111111111111111111111111111111
Reading Page 1:
blk | hex data | binary
----+----------+---------------------------------
  0 | 00088080 | 00000000000010001000000010000000
  1 | E0150A78 | 11100000000101010000101001111000
  2 | 5EECA04E | 01011110111011001010000001001110
  3 | FFFFFFFF | 11111111111111111111111111111111

Tag with "59347" printed as text on card:

proxmark3> lf t55 dump
Reading Page 0:
blk | hex data | binary
----+----------+---------------------------------
  0 | 00088080 | 00000000000010001000000010000000
  1 | E66B4591 | 11100110011010110100010110010001
  2 | 24511139 | 00100100010100010001000100111001
  3 | 11111111 | 00010001000100010001000100010001
  4 | 11111189 | 00010001000100010001000110001001
  5 | FFFFFFFF | 11111111111111111111111111111111
  6 | FFFFFFFF | 11111111111111111111111111111111
  7 | FFFFFFFF | 11111111111111111111111111111111
Reading Page 1:
blk | hex data | binary
----+----------+---------------------------------
  0 | 00088080 | 00000000000010001000000010000000
  1 | E0150A74 | 11100000000101010000101001110100
  2 | 2BCCA8AF | 00101011110011001010100010101111
  3 | FFFFFFFF | 11111111111111111111111111111111

Bytes that change are only the last 2 of block 1 (page 0) and block 2 (page 0). Progressive numbers seems to increment last byte of block 1 of 0x10, and decrement last byte of block 2 of 0x10.

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