2017weight 21.57Riscure

RHme3 - Qualifiers

4 challenges with 11 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

Cryptography2

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

White Box Unboxing
1 pts4 writeups
- crypto
Same technique in picoCTF: It's Not My Fault 2, StegoRSA, AES-ABC
Tracing the Traces
1 pts2 writeups
- crypto
Same technique in picoCTF: It's Not My Fault 2, StegoRSA, AES-ABC

Binary exploitation1

Turn a memory-safety bug in a native binary into control of execution. Usually a stack overflow, a format string, or a heap primitive.

Solve it with:ROP gadget finder Shellcode assembler and library Cyclic pattern generator and offset finder Format string exploit builder Learn: Binary exploitation

Exploitation
1 pts3 writeups
- pwnable
Same technique in picoCTF: lockdown-horses, Guessing Game 1, Bizz Fuzz

Uncategorised1

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

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

Whitebox
2 official solutions
Also written up in: grazfather.github.io, atorralba.github.io

Cryptography2

White Box Unboxing

Tracing the Traces

Binary exploitation1

Exploitation

Uncategorised1

Whitebox

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