RAIT-CTF Sanity Check – Core Team Signal

Flag: RAIT-CTF{S4NI7Y_CH3CK_7HR0UGH_C0R3_734M_D0N3}

Approach (Step by Step)

1. OSINT Collection

By performing basic recon on the RAIT-CTF Core Team, we can find Base64 fragments hidden inside the LinkedIn biographies of four members (Harsh, Chandan, Mrridul, Hrishraj):

1. UGFydDE6IFJBSVQtQ1RGe1M0
2. UGFydDI6IE5JN1lfQ0gzQ0s=
3. UGFydDM6IF83SFIwVUdIX0Mw
4. UGFydDQ6IFIzXzczNE1fRDBOM30=

2. Decoding the Fragments

Decoding each Base64 fragment gives us the labelled parts of the flag:

UGFydDE6IFJBSVQtQ1RGe1M0
→ Part1: RAIT-CTF{S4

UGFydDI6IE5JN1lfQ0gzQ0s=
→ Part2: NI7Y_CH3CK

UGFydDM6IF83SFIwVUdIX0Mw
→ Part3: _7HR0UGH_C0

UGFydDQ6IFIzXzczNE1fRDBOM30=
→ Part4: R3_734M_D0N3}

3. Assembly

Putting Part 1 → Part 2 → Part 3 → Part 4 together in the correct order gives us the final flag:

RAIT-CTF{S4NI7Y_CH3CK_7HR0UGH_C0R3_734M_D0N3}