UTCTF_2024_Misc_CCV

题目描述

CCV

I've got some credit cards but I don't which ones are valid. Where did I get them? Uh, that's not important.
Oh, you'll probably need this: dae55498c432545826fb153885bcb06b
By mzone (@mzone on discord)

nc puffer.utctf.live 8625

young@ubuntu:~ $  nc puffer.utctf.live 8625
I'll provide you a PAN, date as MMYY, CSC, and a CVV.
You just need to reply with 1 if its valid and 0 if it's invalid.
I'm counting on you. And be sure to keep track of your answers so we don't need to check these again.

PAN: 999554623155882931, date: 0873, code: 473, cvv: 900
Valid?
1
Good job.
PAN: 707283974428771, date: 1027, code: 617, cvv: 253
Valid?
1
You're a big help.
PAN: 92893664848022323, date: 0179, code: 683, cvv: 712
Valid?
1
Nice work!
PAN: 578657095474557841, date: 0239, code: 926, cvv: 363
Valid?
1
Are you just guessing?

信用卡知识

安全码(CSC)

参考:维基百科-银行卡安全码

不同的发卡组织的信用卡安全码的名称和印刷位置不同:

  • “CSC”(Card Security Code,银行卡安全代码):美国运通卡(American Express),为3位数字,印于借记卡背面。

  • “CID”(Card ID,银行卡识别码):发现卡(Discover)、美国运通卡(American Express),为4位数字,印于银行卡正面。美国运通卡通常使用银行卡正面的4位数字,称为银行卡识别码(CID),但在银行卡背面也有一个3位数的代码,称为银行卡安全码(CSC)。

  • “CVC”(Card Validation Code,银行卡验证码):万事达卡(Mastercard),为3位数字,平印于银行卡背面。

  • “CVV”(Card Verification Value,银行卡验证值):Visa卡(Visa),为3位数字,平印于银行卡背面。

  • “CAV”(Card Authentication Value,银行卡验证值):JCB卡(JCB),为3位数字,平印于银行卡背面。

  • “CVD”(Card Verification Data,银行卡验证数据):发现卡(Discover),为3位数字,平印于银行卡背面。

  • “CVN”(Card Validation Number,银行卡验证数字):中国银联卡(China UnionPay),为3位数字,平印于银行卡背面。

发卡行识别码(PAN)

参考:维基百科-发卡行识别码

PAN (Payment Card Number,发卡行识别码),

参考

最后更新于