b00tl3gRSA2

Problem

Lets decrypt this: ciphertext? Something seems a bit small

Solution

  1. 1.
    Open Ciphertext
  2. 2.
    Use RsaCtfTool to run python RsaCtfTool.py --uncipher 2205316413931134031074603746928247799030155221252519872650101242908540609117693035883827878696406295617513907962419726541451312273821810017858485722109359971259158071688912076249144203043097720816270550387459717116098817458584146690177125 -e 3 -n 29331922499794985782735976045591164936683059380558950386560160105740343201513369939006307531165922708949619162698623675349030430859547825708994708321803705309459438099340427770580064400911431856656901982789948285309956111848686906152664473350940486507451771223435835260168971210087470894448460745593956840586530527915802541450092946574694809584880896601317519794442862977471129319781313161842056501715040555964011899589002863730868679527184420789010551475067862907739054966183120621407246398518098981106431219207697870293412176440482900183550467375190239898455201170831410460483829448603477361305838743852756938687673
  3. 3.
    Within a few seconds you should get the flag.

Flag

picoCTF{n33d_a_lArg3r_e_ff7cfba1}