PCSCEMV icon indicating copy to clipboard operation
PCSCEMV copied to clipboard
verified publisher icon merlokk

I have factored one of the emv ca keys

Open daedalus opened this issue 5 years ago • 3 comments

Hi,

Would you like to blacklist key:

C26B3CB3833E42D8270DC10C8999B2DA18106838650DA0DBF154EFD51100AD144741B2A87D6881F8630E3348DEA3F78038E9B21A697EB2A6716D32CBF26086F1

Factors are:

115338223124148073246066539284259030047206160722550264228951126159764481601719 * 88284208662472299300994477374641636504474777116290547486974188574074426772887

daedalus avatar May 31 '20 03:05 daedalus

factors should have the same size. and this is demo key.

btw. it copied from https://www.eftlab.com/knowledge-base/243-ca-public-keys/ this calculator is good https://www.mobilefish.com/services/rsa_key_generation/rsa_key_generation.php

according it bitsize should be 256 instead of 308 and 309)

merlokk avatar May 31 '20 11:05 merlokk

For me checks

c26b3cb3833e42d8270dc10c8999b2da18106838650da0dbf154efd51100ad144741b2a87d6881f8630e3348dea3f78038e9b21a697eb2a6716d32cbf26086f1 =

10182543757051076191600478226326544361189272628757089241445280749881048531447197141602768527045481887369366286852553187388361750872777544108286430001792753 = 115338223124148073246066539284259030047206160722550264228951126159764481601719 * 88284208662472299300994477374641636504474777116290547486974188574074426772887

I'll be glad to know if it is a demo key and not an actual signing key.

daedalus avatar May 31 '20 13:05 daedalus

https://www.boxentriq.com/code-breaking/big-number-calculator yes, your formula is correct. P and Q should prime (ok: https://kevincobain2000.github.io/miller-rabin-primality-test-online/)

yes, its an old key

merlokk avatar May 31 '20 14:05 merlokk