2020weight 21.44Alpha-maniak

riftCTF

28 challenges with 55 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

OSINT7

Answer a question about the real world from public sources. The work is pivoting between identifiers, not exploiting anything.

Solve it with:EXIF metadata viewer QR code decoder

Osint 0x0003
150 pts2 writeups
- osint
Same technique in picoCTF: Permissions, Specialer, Codebook
Osint 0x0005
150 pts2 writeups
- osint
Same technique in picoCTF: Permissions, Specialer, Codebook
Osint 0X0001
100 pts1 writeup
- osint
Same technique in picoCTF: Permissions, Specialer, Codebook
Osint 0x0004
200 pts1 writeup
- osint
Same technique in picoCTF: Permissions, Specialer, Codebook
Osint 0x0006
500 pts1 writeup
- osint
Same technique in picoCTF: Permissions, Specialer, Codebook
Osint 0x0007
300 pts1 writeup
- osint
Same technique in picoCTF: Permissions, Specialer, Codebook
Osint 0x0008
300 pts1 writeup
- osint
Same technique in picoCTF: Permissions, Specialer, Codebook

Cryptography6

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

crypto 0x0001
100 pts3 writeups
- base64
Same technique in picoCTF: interencdec, StegoRSA, Timestamped Secrets
crypto 0x0002
200 pts3 writeups
- crypto
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC
crypto 0x0004
150 pts3 writeups
- crypto
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC
crypto 0x0005
100 pts3 writeups
- substitution
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC
crypto 0x0007
150 pts3 writeups
- crypto
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC
crypto 0x0003
150 pts1 writeup
- crypto
Same technique in picoCTF: StegoRSA, Timestamped Secrets, AES-ABC

Misc6

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

Misc 0x0002
100 pts2 writeups
- miscellaneous
Same technique in picoCTF: Permissions, Specialer, Codebook
Misc 0x0003
100 pts2 writeups
- misc
Same technique in picoCTF: Permissions, Specialer, Codebook
Misc 0x0004
100 pts2 writeups
- xor
Same technique in picoCTF: Permissions, Specialer, Codebook
Misc 0x0005
30 pts2 writeups
- trivia
Same technique in picoCTF: Permissions, Specialer, Codebook
Misc 0x0006
50 pts2 writeups
- trivia
Same technique in picoCTF: Permissions, Specialer, Codebook
Misc 0x0001
20 pts1 writeup
- misc
- sanitycheck
- miscellaneous
Same technique in picoCTF: Permissions, Specialer, Codebook

Reverse engineering3

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

Rev 0x0001
50 pts2 writeups
- rev
Same technique in picoCTF: WinAntiDbg0x100, WinAntiDbg0x200, WinAntiDbg0x300
Rev 0x0002
100 pts2 writeups
- rev
Same technique in picoCTF: WinAntiDbg0x100, WinAntiDbg0x200, WinAntiDbg0x300
Rev 0x0004
300 pts1 writeup
- reversing
Same technique in picoCTF: WinAntiDbg0x100, WinAntiDbg0x200, WinAntiDbg0x300

Forensics3

Recover something from a file, a capture, or a disk image - often from a part of it the format says is unused.

Solve it with:File type identifier by magic bytes Magic byte and file signature table PCAP analyzer for CTF network forensics EXIF metadata viewer Learn: File forensics and carving Learn: Network forensics

Forensics 0x0001
100 pts2 writeups
- forensics
Same technique in picoCTF: FindAndOpen, c0rrupt, extensions
Forensics 0x0002
300 pts1 writeup
- forensics
Same technique in picoCTF: FindAndOpen, c0rrupt, extensions
Forensics 0x0004
100 pts1 writeup
- forensics
Same technique in picoCTF: FindAndOpen, c0rrupt, extensions

Steganography3

Find the payload hidden inside a carrier that looks ordinary. Bit planes, appended data, metadata, and audio spectrograms.

Solve it with:LSB steganography extractor PNG chunk analyzer Audio spectrogram and SSTV decoder Zero-width character and text steganography decoder Learn: Steganography

Stegano 0x0001
100 pts4 writeups
- strings
Same technique in picoCTF: FindAndOpen, StegoRSA, Glory of the Garden
Stegano 0x0003
200 pts3 writeups
- audacity
Same technique in picoCTF: FindAndOpen, StegoRSA, Glory of the Garden
Stegano 0x0004
200 pts3 writeups
- strings
Same technique in picoCTF: FindAndOpen, StegoRSA, Glory of the Garden

OSINT7

Osint 0x0003

Osint 0x0005

Osint 0X0001

Osint 0x0004

Osint 0x0006

Osint 0x0007

Osint 0x0008

Cryptography6

crypto 0x0001

crypto 0x0002

crypto 0x0004

crypto 0x0005

crypto 0x0007

crypto 0x0003

Misc6

Misc 0x0002

Misc 0x0003

Misc 0x0004

Misc 0x0005

Misc 0x0006

Misc 0x0001

Reverse engineering3

Rev 0x0001

Rev 0x0002

Rev 0x0004

Forensics3

Forensics 0x0001

Forensics 0x0002

Forensics 0x0004

Steganography3

Stegano 0x0001

Stegano 0x0003

Stegano 0x0004

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