2025weight 21.67SPbCTF

Alfa Surfing CTF

3 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

Binary exploitation2

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

ЭМОциональное приключение (emobpf)
1000 pts1 writeup
Also written up in: mephi42/ctf, mephi42/ctf
- pwn
- kernel
- bpf
Same technique in picoCTF: lockdown-horses, Guessing Game 1, Bizz Fuzz
Запутанная история (octopus)
892 pts1 writeup
Also written up in: revervand.github.io
- pwn
- network
Same technique in picoCTF: lockdown-horses, Guessing Game 1, Bizz Fuzz

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

Бинарный ливень (binrain)
847 pts1 writeup
- aes
- pwn
- crypto
Same technique in picoCTF: AES-ABC, Compress and Attack, cryptomaze

Binary exploitation2

ЭМОциональное приключение (emobpf)

Запутанная история (octopus)

Cryptography1

Бинарный ливень (binrain)

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