February 4, 2018
RSA
certificate
This question giving a packet “miro.pcap“ and a python file “client.py“.
Just read through the code, you will find this client.py is an easy puzzl ...
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February 4, 2018
RSA
ChallengeThis code generates general(random) RSA keys
Given1234567#[*] Encrypted Data : 380838525806255337893946743050327173947433371586247814759 ...
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December 19, 2017
RSA
factor
Ps and QsChallenge12345Ps and QsDecrypt it.update: we fixed the flag, please try to submit again.psqs1-0dd2921c9fbdb738e51639801f64164dd144d077101 ...
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December 19, 2017
Classical
Vigenère
Given : vigenere3d.py
This challenge is Vigenère cipher, but make it to a cube.
Each level has a Vigenère table and rorate 1 alphabet for every fl ...
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December 11, 2017
ECC
Key exchange
The title give us some tips : SECP384R1 -> Ellicptic Curve
Try Connect to the server, you can find there are two dev talking.
As the title, we ...
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December 11, 2017
Brute-force
Blockcipher
1Simon_96_64, ECB, key="SECCON{xxxx}", plain=0x6d564d37426e6e71, cipher=0xbb5d12ba422834b5
I found Simon algorithm at : http ...
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December 11, 2017
RSA
certificate
Very SmoothIn Pcap :Find Client and Server’s ConversationCipher Suite TLS_RSA_WITH_AES_128_CBC_SHA (0x002f)
Find Certificate in PcapGet Certificat ...
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May 13, 2017
RSA
Exploit
RSA 題常見的情況$$c = m^e \ mod\ N$$
如果遇到 500 bit 左右，或是以下的因為數值不大，可以先試試直接爆破 :
SageMath
factordb
yafu
如果 N 的其中一個質數是 K-smooth 數 (k不大) :
像是 N ...
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May 11, 2017
Intro
Algorithm
中國餘式定理如果N為合數 ( $N = n_1 \times \ n_2 \ \times \ n_3 \ \times\ …\ \times \ n_n$ )，同個質數可以一起算 (ex: $n_1 = p^{3}$)
假設我只有 ($a_1,a_2,a_ ...
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May 11, 2017
Intro
Padding Oracle
冷知識：
Oracle (神諭) – 神明可以告訴你任何事情的答案
Padding Oracle – 用 Padding 告訴你 “你想知道的答案Ａ＿Ａ”
針對 CBC 的各種加密 ：適用於：
CAST-cbc
aes-128-cbc
aes-192-cbc
aes-256-cbc ...
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