2020weight 0.000xPharaohs

Cryptography CTF

5 challenges with 7 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

Chall
3 official solutions
Also written up in: hkcert-ctf/CTF-Challenges, hkcert-ctf/CTF-Challenges, hkcert-ctf/CTF-Challenges
3. Signature (I)
1 official solution
Also written up in: hkcert-ctf/CTF-Challenges
Enc
1 official solution
Also written up in: hkcert-ctf/CTF-Challenges

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

Hitman
100 pts1 writeup
- crypto
- beginner
Same technique in picoCTF: It's Not My Fault 2, StegoRSA, AES-ABC

Misc1

Everything that fits no other box: esolangs, puzzles, scripting exercises, and the jail escapes that have not yet earned their own category.

Solve it with:Brainfuck and esolang decoder Cipher identifier and automatic decoder Regex tester with match offsets and capture groups Learn: Recognising encodings

Signature
1 official solution
Also written up in: hkcert-ctf/CTF-Challenges

Uncategorised3

Chall

3. Signature (I)

Enc

Cryptography1

Hitman

Misc1

Signature

Other 2020 events