K3RN3LCTF
31 challenges with 47 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 CTFtimeCryptography16
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.
- aes
- audacity
- sha256
Same technique in picoCTF: Timestamped Secrets, AES-ABC, Compress and Attack
- crypto
- rsa
Same technique in picoCTF: StegoRSA, john_pollard, rsa_oracle
- crypto
- rsa
Same technique in picoCTF: StegoRSA, john_pollard, rsa_oracle
- nonce-reuse
- aes-ctr
- crypto
- leak
Same technique in picoCTF: Timestamped Secrets, AES-ABC, Compress and Attack
- hill-cipher
- linear-algebra
- crypto
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC
- linearization
- crypto
- affine
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC
- xor
- crypto
- fuzzing
Same technique in picoCTF: Custom encryption, triple-secure, XtraORdinary
- game-of-life
- crypto
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC
- oracle
- hamming-distance
- crypto
- dsa
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC
- crypto
- domain-injection
- dsa
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC
- crypto
- rsa
Same technique in picoCTF: StegoRSA, john_pollard, rsa_oracle
- polynomial
- crypto
- rsa
Same technique in picoCTF: StegoRSA, john_pollard, rsa_oracle
- polynomial
- crypto
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC
- blinding
- paillier
- crypto
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC
- number-theory
- clock-group
- dlp
- crypto
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC
- coppersmith
- timestamps
- crypto
- franklin-reiter
- rsa
Same technique in picoCTF: StegoRSA, john_pollard, rsa_oracle
Binary exploitation6
Turn a memory-safety bug in a native binary into control of execution. Usually a stack overflow, a format string, or a heap primitive.
- pwn
Same technique in picoCTF: Guessing Game 1, x-sixty-what, format string 3
- pwn
- tcache
- heap-overflow
Same technique in picoCTF: Guessing Game 1, x-sixty-what, PIE TIME 2
- pwn
- fsb
Same technique in picoCTF: Guessing Game 1, x-sixty-what, format string 3
- pwn
- python
Same technique in picoCTF: Guessing Game 1, x-sixty-what, format string 3
- rop
- pwn
- kernel
Same technique in picoCTF: Guessing Game 1, x-sixty-what, Binary Gauntlet 3
- pwn
Same technique in picoCTF: Guessing Game 1, x-sixty-what, Binary Gauntlet 3
Reverse engineering6
Work out what a compiled program does without its source, then work backwards from the check to the input that passes it.
- assembly
Same technique in picoCTF: Forky, reverse_cipher, Easy as GDB
- reverseengineering
- re
- java
Same technique in picoCTF: vault-door-1, vault-door-3, vault-door-4
- rev
Same technique in picoCTF: WinAntiDbg0x100, WinAntiDbg0x200, WinAntiDbg0x300
- rev
Same technique in picoCTF: WinAntiDbg0x100, WinAntiDbg0x200, WinAntiDbg0x300
- rev
Same technique in picoCTF: WinAntiDbg0x100, WinAntiDbg0x200, WinAntiDbg0x300
- rev
- vm
Same technique in picoCTF: WinAntiDbg0x100, WinAntiDbg0x200, WinAntiDbg0x300
Misc3
Everything that fits no other box: esolangs, puzzles, scripting exercises, and the jail escapes that have not yet earned their own category.
- python
- xor
Same technique in picoCTF: PW Crack 1, PW Crack 2, PW Crack 3
- pwntools
- python
Same technique in picoCTF: PW Crack 1, PW Crack 2, PW Crack 3
- algorithms
- misc
Same technique in picoCTF: Permissions, Specialer, Codebook