2018weight 25.00ICON organizers

ICON CTF Quals

5 challenges with 6 published community solutions between them. Solution links go to CTFtime’s task page, which aggregates every writeup for a challenge - individual blog posts rot, the aggregator does not.

Full task list on CTFtime

Uncategorised3

The upstream scoreboard did not say, so neither do we.

Solve it with:Cipher identifier and automatic decoder Learn: Recognising encodings

Crackme
1 official solution
Also written up in: JustBeYou/ctfs
Wb Sol1
1 official solution
Also written up in: sw1ss/ctf
Wb Sol2
1 official solution
Also written up in: sw1ss/ctf

Cryptography1

Recover a plaintext or a key from something that was supposed to protect it. In practice: identify the scheme, find the parameter the author got wrong, exploit it.

Solve it with:Cipher identifier and automatic decoder Vigenere cipher solver with automatic key recovery RSA decryption and attack runner Wiener’s attack on small RSA private exponents In-browser hash cracker with rule transforms Learn: Classical ciphers and frequency analysis Learn: RSA and the parameters that break it

Second challenge
1 writeup
Also written up in: sw1ss/ctf
- cryptography
Same technique in picoCTF: It's Not My Fault 2, StegoRSA, AES-ABC

Reverse engineering1

Work out what a compiled program does without its source, then work backwards from the check to the input that passes it.

Solve it with:Strings extractor for binaries and blobs WebAssembly disassembler Java .class disassembler Python .pyc bytecode disassembler Learn: Binary exploitation

Third Challenge
1 pts1 writeup
- reverse
- engineering
Same technique in picoCTF: Checkpass, WinAntiDbg0x100, WinAntiDbg0x200

Uncategorised3

Crackme

Wb Sol1

Wb Sol2

Cryptography1

Second challenge

Reverse engineering1

Third Challenge

Other 2018 events