Search found 86 matches

by BirdKing
Tue Nov 17, 2015 4:34 am
Forum: Algorithm School
Topic: how to define total length of ECC F2M 571bits signture
Replies: 5
Views: 2982

Re: how to define total length of ECC F2M 571bits signture

Thank you for your help.
I finally understood how to struct the R and S. Following the TLV, I can get the right signature.
Thank everybody.
by BirdKing
Fri Nov 06, 2015 12:31 am
Forum: Algorithm School
Topic: Why length of R is 168bits in ECC FP 160?
Replies: 1
Views: 1601

Why length of R is 168bits in ECC FP 160?

hello,
Lately, I tested ECC. When I generated a ecc keypair of 160bits, I found the length R is 168bits. That made me very doubt.
Why length of R is 168bits while ecc key length is 160bits?
by BirdKing
Fri Nov 06, 2015 12:22 am
Forum: Algorithm School
Topic: how to define total length of ECC F2M 571bits signture
Replies: 5
Views: 2982

Re: how to define total length of ECC F2M 571bits signture

UNKNwYSHSA wrote:Have you tried to calculate the signature of this bits length using openssl?

yes. I got a signature such as "30 81 94 02 ...".
by BirdKing
Wed Nov 04, 2015 9:37 pm
Forum: Communication
Topic: How long after the fido u2f initialization package to receive cont packets?
Replies: 1
Views: 1956

How long after the fido u2f initialization package to receive cont packets?

hello,
I have a question about fido. how process time out?
When I received a fido init packet and payload data length is greater than report payload, I need receive cont packet. Then, how long after the fido u2f initialization package to receive cont packets?
by BirdKing
Wed Nov 04, 2015 7:34 am
Forum: Shopping FAQ
Topic: Have cards with mifare?
Replies: 3
Views: 2401

Have cards with mifare?

hello,
Do you have cards with mifare? which chip manufacturer of the card?
by BirdKing
Wed Nov 04, 2015 7:30 am
Forum: Algorithm School
Topic: how to define total length of ECC F2M 571bits signture
Replies: 5
Views: 2982

how to define total length of ECC F2M 571bits signture

Hello,
when I compute a signature of ecc f2m 571bits, I get a result. But the result's length greater than 0x80. how to define total length of ECC F2M 571bits signture?
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