[Mifare Classic 1k] Error 6982 when reading: security status not satisfied

[Arthur Cousseau]

Hello there,
I'm stuck on this since yesterday.
I'm trying to communicate with a Mifare Classic 1k, apparently.
I say apparently, because I'm using a C# Winform Solution I found on the web to do my tests, and the header of the command is hardcoded:
It begins with 0xFFF400[n]10 when writing (where n is the block number), and 0xFFF300[n]10 when I read.
First, tell me if I'm wrong with all of this!
I'm a very beginner at RFID/NFC cards. I'm still struggling with the documentation online, trying to solve my problem.

I'm actually trying to write some JSON on the card.
I discovered that my card has 64 "blocks", starting from 0 to 63, and each block is 16 bytes.
I found out that I couldn't write on the 1st block (index 0), probably because some basic data/id is written there to identify the card.

So, if I'm with this string: "12345678901234567", which is 17 bytes, I do as follows:
- I cut this in 2 strings of 16 characters
- I complete the last string with spaces, if its length is not 16
- I write on the card each string, starting at block index 1, and I increment the index before writing next string

In this case, I should have this:
Block 0: [some data]
Block 1: 1234567890123456
Block 2: 7

Alright, so it should work with a simple JSON. Let's say:
{
"Passphrase" = "AZESDSFS 34435TEG RKR",
"Type" = 0,
"HardwareID" = 1234567890,
"Balance" = 12
}

The writing succeeds.
But the reading gives me this error: "6982: Check error: security status not satisfied".
I've not found that much info on that after 3 hours of research.
I've heard of this forum, and I hope I'm at the right spot to finally get an answer ! :)

P.S: weirdly, I can read the card, but from the block index 4 only; everything before gives me the answer above.
Starting from block index 4, I manage to get the end of the message, something like:
Block 4: wareID" = 123456
Block 5: 7890,"Balance
Block 6: " = 12

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[Arthur Cousseau]

Ok, so I found out pretty much everything I needed with the pdf I link here: http://www.mouser.com/ds/2/302/MF1S503x-89574.pdf

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[TapLinx Support]

Hi Arthur,

Please do not confuse: MIFARE Classic 1K has 16 sectors with 4 blocks each. MIFARE Classic 4K has 32 sectors with 4 blocks each and 8 sectors with 16 blocks each.

Block 0 in sector 0 is not writable, it contains the UID and manufacturer data.

The TapLinx team

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