# SecuInside CTF Quals 2k14: Reversing - yayaya (100 points)

# xdotool getmouselocation
# while [ True ]; do import -window root -delay 0 -crop 400x388-0+112 `date +%d%m%y%H%M%S`-$RANDOM.png; sleep 0.1; done
# cat blend-point.py
from PIL import Image
from glob import glob

i2 = None

for f in glob('*.png'):
    i1 = Image.open(f).point(lambda i: 255 if i > 0 else i)
    if i2 is None:
    i2 = i1
    i2 = Image.blend(i1, i2, 0.5).point(lambda i: 255 if i > 0 else i)

#i2.show()
i2.save('result.png')
# convert -crop 330x70+0+0 result.png flag.png
# xxd -p flag.png | tr -d '\n'
89504e470d0a1a0a0000000d494844520000014a00000046010000000082e7e0670000000467414d410000b18f0bfc6105000000017352474200aece1ce9000000206348524d00007a26000080840000fa00000080e8000075300000ea6000003a98000017709cba513c00000002624b47440001dd8a13a4000000097048597300000048000000480046c96b3e0000000976704167000001900000018400f0ee97860000009e4944415448c7ed93410a42310c440772805ea890ab077aa11e2010271111dde842f9b5fe218b69fb3633a4c05724310c1deae8e2aba32606218ede5fc53a1a850e63b4f146acc3d18c25a362d12f8f3294715d7265d6464f9dfa45694c3814cd6422c2ae266f38e536479bf14aa67ab39cf209d451ff0105821c6ecf34111c6f5128ddee682e4716846aa78ac34359d81dcd0f734725ec795df6473faa0b51cd2729b92be3540000002574455874646174653a63726561746500323031342d30362d30355431393a35383a31332b30323a3030ee0ccf6a0000002574455874646174653a6d6f6469667900323031342d30362d30355431393a35383a31332b30323a30309f5177d60000000049454e44ae426082

# SecuInside CTF Quals 2k14: Speed Game - Mic Check (7 points)

# ./rot.py -m inline -d "Q2QnT29oUNW0wtWqySDbw2UhvRIkTRrby2Qdx2g0UOjbwCHoTRrpw3Ei"


['ABCDEFGHIJKLMNOPQRSTUVWXYZ'] (26)

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(17) H2HnK29oLEN0wtNqyJUbw2LhvIZkKIrby2Hdx2g0LFjbwTYoKIrpw3Vi
(18) I2InL29oMFO0wtOqyKVbw2MhvJAkLJrby2Idx2g0MGjbwUZoLJrpw3Wi
(19) J2JnM29oNGP0wtPqyLWbw2NhvKBkMKrby2Jdx2g0NHjbwVAoMKrpw3Xi
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(24) O2OnR29oSLU0wtUqyQBbw2ShvPGkRPrby2Odx2g0SMjbwAFoRPrpw3Ci
(25) P2PnS29oTMV0wtVqyRCbw2ThvQHkSQrby2Pdx2g0TNjbwBGoSQrpw3Di

['abcdefghijklmnopqrstuvwxyz'] (26)

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(3) Q2QqT29rUNW0zwWtbSDez2UkyRInTRueb2Qga2j0UOmezCHrTRusz3El
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(25) Q2QmT29nUNW0vsWpxSDav2UguRIjTRqax2Qcw2f0UOiavCHnTRqov3Eh

['ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz'] (52)

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['abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'] (52)

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(49) N2NkQ29lRKT0tqTnvPAYt2ResOFhQOoYv2Nau2d0RLgYtzElQOomt3Bf
(50) O2OlR29mSLU0urUowQBZu2SftPGiRPpZw2Obv2e0SMhZuAFmRPpnu3Cg
(51) P2PmS29nTMV0vsVpxRCav2TguQHjSQqax2Pcw2f0TNiavBGnSQqov3Dh
# ./rot.py -m tracks -d "Q2QnT29oUNW0wtWqySDbw2UhvRIkTRrby2Qdx2g0UOjbwCHoTRrpw3Ei"

['ABCDEFGHIJKLMNOPQRSTUVWXYZ'] (26)

(0) Q2QnT29oUNW0wtWqySDbw2UhvRIkTRrby2Qdx2g0UOjbwCHoTRrpw3Ei
(1) R2RnU29oVOX0wtXqyTEbw2VhvSJkUSrby2Rdx2g0VPjbwDIoUSrpw3Fi
(2) S2SnV29oWPY0wtYqyUFbw2WhvTKkVTrby2Sdx2g0WQjbwEJoVTrpw3Gi
(3) T2TnW29oXQZ0wtZqyVGbw2XhvULkWUrby2Tdx2g0XRjbwFKoWUrpw3Hi
(4) U2UnX29oYRA0wtAqyWHbw2YhvVMkXVrby2Udx2g0YSjbwGLoXVrpw3Ii
(5) V2VnY29oZSB0wtBqyXIbw2ZhvWNkYWrby2Vdx2g0ZTjbwHMoYWrpw3Ji
(6) W2WnZ29oATC0wtCqyYJbw2AhvXOkZXrby2Wdx2g0AUjbwINoZXrpw3Ki
(7) X2XnA29oBUD0wtDqyZKbw2BhvYPkAYrby2Xdx2g0BVjbwJOoAYrpw3Li
(8) Y2YnB29oCVE0wtEqyALbw2ChvZQkBZrby2Ydx2g0CWjbwKPoBZrpw3Mi
(9) Z2ZnC29oDWF0wtFqyBMbw2DhvARkCArby2Zdx2g0DXjbwLQoCArpw3Ni
(10) A2AnD29oEXG0wtGqyCNbw2EhvBSkDBrby2Adx2g0EYjbwMRoDBrpw3Oi
(11) B2BnE29oFYH0wtHqyDObw2FhvCTkECrby2Bdx2g0FZjbwNSoECrpw3Pi
(12) C2CnF29oGZI0wtIqyEPbw2GhvDUkFDrby2Cdx2g0GAjbwOToFDrpw3Qi
(13) D2DnG29oHAJ0wtJqyFQbw2HhvEVkGErby2Ddx2g0HBjbwPUoGErpw3Ri
(14) E2EnH29oIBK0wtKqyGRbw2IhvFWkHFrby2Edx2g0ICjbwQVoHFrpw3Si
(15) F2FnI29oJCL0wtLqyHSbw2JhvGXkIGrby2Fdx2g0JDjbwRWoIGrpw3Ti
(16) G2GnJ29oKDM0wtMqyITbw2KhvHYkJHrby2Gdx2g0KEjbwSXoJHrpw3Ui
(17) H2HnK29oLEN0wtNqyJUbw2LhvIZkKIrby2Hdx2g0LFjbwTYoKIrpw3Vi
(18) I2InL29oMFO0wtOqyKVbw2MhvJAkLJrby2Idx2g0MGjbwUZoLJrpw3Wi
(19) J2JnM29oNGP0wtPqyLWbw2NhvKBkMKrby2Jdx2g0NHjbwVAoMKrpw3Xi
(20) K2KnN29oOHQ0wtQqyMXbw2OhvLCkNLrby2Kdx2g0OIjbwWBoNLrpw3Yi
(21) L2LnO29oPIR0wtRqyNYbw2PhvMDkOMrby2Ldx2g0PJjbwXCoOMrpw3Zi
(22) M2MnP29oQJS0wtSqyOZbw2QhvNEkPNrby2Mdx2g0QKjbwYDoPNrpw3Ai
(23) N2NnQ29oRKT0wtTqyPAbw2RhvOFkQOrby2Ndx2g0RLjbwZEoQOrpw3Bi
(24) O2OnR29oSLU0wtUqyQBbw2ShvPGkRPrby2Odx2g0SMjbwAFoRPrpw3Ci
(25) P2PnS29oTMV0wtVqyRCbw2ThvQHkSQrby2Pdx2g0TNjbwBGoSQrpw3Di

['abcdefghijklmnopqrstuvwxyz'] (26)

(0) Q2QnT29oUNW0wtWqySDbw2UhvRIkTRrby2Qdx2g0UOjbwCHoTRrpw3Ei
(1) Q2QoT29pUNW0xuWrzSDcx2UiwRIlTRscz2Qey2h0UOkcxCHpTRsqx3Ej
(2) Q2QpT29qUNW0yvWsaSDdy2UjxRImTRtda2Qfz2i0UOldyCHqTRtry3Ek
(3) Q2QqT29rUNW0zwWtbSDez2UkyRInTRueb2Qga2j0UOmezCHrTRusz3El
(4) Q2QrT29sUNW0axWucSDfa2UlzRIoTRvfc2Qhb2k0UOnfaCHsTRvta3Em
(5) Q2QsT29tUNW0byWvdSDgb2UmaRIpTRwgd2Qic2l0UOogbCHtTRwub3En
(6) Q2QtT29uUNW0czWweSDhc2UnbRIqTRxhe2Qjd2m0UOphcCHuTRxvc3Eo
(7) Q2QuT29vUNW0daWxfSDid2UocRIrTRyif2Qke2n0UOqidCHvTRywd3Ep
(8) Q2QvT29wUNW0ebWygSDje2UpdRIsTRzjg2Qlf2o0UOrjeCHwTRzxe3Eq
(9) Q2QwT29xUNW0fcWzhSDkf2UqeRItTRakh2Qmg2p0UOskfCHxTRayf3Er
(10) Q2QxT29yUNW0gdWaiSDlg2UrfRIuTRbli2Qnh2q0UOtlgCHyTRbzg3Es
(11) Q2QyT29zUNW0heWbjSDmh2UsgRIvTRcmj2Qoi2r0UOumhCHzTRcah3Et
(12) Q2QzT29aUNW0ifWckSDni2UthRIwTRdnk2Qpj2s0UOvniCHaTRdbi3Eu
(13) Q2QaT29bUNW0jgWdlSDoj2UuiRIxTReol2Qqk2t0UOwojCHbTRecj3Ev
(14) Q2QbT29cUNW0khWemSDpk2UvjRIyTRfpm2Qrl2u0UOxpkCHcTRfdk3Ew
(15) Q2QcT29dUNW0liWfnSDql2UwkRIzTRgqn2Qsm2v0UOyqlCHdTRgel3Ex
(16) Q2QdT29eUNW0mjWgoSDrm2UxlRIaTRhro2Qtn2w0UOzrmCHeTRhfm3Ey
(17) Q2QeT29fUNW0nkWhpSDsn2UymRIbTRisp2Quo2x0UOasnCHfTRign3Ez
(18) Q2QfT29gUNW0olWiqSDto2UznRIcTRjtq2Qvp2y0UObtoCHgTRjho3Ea
(19) Q2QgT29hUNW0pmWjrSDup2UaoRIdTRkur2Qwq2z0UOcupCHhTRkip3Eb
(20) Q2QhT29iUNW0qnWksSDvq2UbpRIeTRlvs2Qxr2a0UOdvqCHiTRljq3Ec
(21) Q2QiT29jUNW0roWltSDwr2UcqRIfTRmwt2Qys2b0UOewrCHjTRmkr3Ed
(22) Q2QjT29kUNW0spWmuSDxs2UdrRIgTRnxu2Qzt2c0UOfxsCHkTRnls3Ee
(23) Q2QkT29lUNW0tqWnvSDyt2UesRIhTRoyv2Qau2d0UOgytCHlTRomt3Ef
(24) Q2QlT29mUNW0urWowSDzu2UftRIiTRpzw2Qbv2e0UOhzuCHmTRpnu3Eg
(25) Q2QmT29nUNW0vsWpxSDav2UguRIjTRqax2Qcw2f0UOiavCHnTRqov3Eh

['ABCDEFGHIJKLMNOPQRSTUVWXYZ', 'abcdefghijklmnopqrstuvwxyz'] (26)

(0) Q2QnT29oUNW0wtWqySDbw2UhvRIkTRrby2Qdx2g0UOjbwCHoTRrpw3Ei
(1) R2RoU29pVOX0xuXrzTEcx2ViwSJlUSscz2Rey2h0VPkcxDIpUSsqx3Fj
(2) S2SpV29qWPY0yvYsaUFdy2WjxTKmVTtda2Sfz2i0WQldyEJqVTtry3Gk
(3) T2TqW29rXQZ0zwZtbVGez2XkyULnWUueb2Tga2j0XRmezFKrWUusz3Hl
(4) U2UrX29sYRA0axAucWHfa2YlzVMoXVvfc2Uhb2k0YSnfaGLsXVvta3Im
(5) V2VsY29tZSB0byBvdXIgb2ZmaWNpYWwgd2Vic2l0ZTogbHMtYWwub3Jn  ==  Welcome to our official website: ls-al.org
(6) W2WtZ29uATC0czCweYJhc2AnbXOqZXxhe2Wjd2m0AUphcINuZXxvc3Ko
(7) X2XuA29vBUD0daDxfZKid2BocYPrAYyif2Xke2n0BVqidJOvAYywd3Lp
(8) Y2YvB29wCVE0ebEygALje2CpdZQsBZzjg2Ylf2o0CWrjeKPwBZzxe3Mq
(9) Z2ZwC29xDWF0fcFzhBMkf2DqeARtCAakh2Zmg2p0DXskfLQxCAayf3Nr
(10) A2AxD29yEXG0gdGaiCNlg2ErfBSuDBbli2Anh2q0EYtlgMRyDBbzg3Os
(11) B2ByE29zFYH0heHbjDOmh2FsgCTvECcmj2Boi2r0FZumhNSzECcah3Pt
(12) C2CzF29aGZI0ifIckEPni2GthDUwFDdnk2Cpj2s0GAvniOTaFDdbi3Qu
(13) D2DaG29bHAJ0jgJdlFQoj2HuiEVxGEeol2Dqk2t0HBwojPUbGEecj3Rv
(14) E2EbH29cIBK0khKemGRpk2IvjFWyHFfpm2Erl2u0ICxpkQVcHFfdk3Sw
(15) F2FcI29dJCL0liLfnHSql2JwkGXzIGgqn2Fsm2v0JDyqlRWdIGgel3Tx
(16) G2GdJ29eKDM0mjMgoITrm2KxlHYaJHhro2Gtn2w0KEzrmSXeJHhfm3Uy
(17) H2HeK29fLEN0nkNhpJUsn2LymIZbKIisp2Huo2x0LFasnTYfKIign3Vz
(18) I2IfL29gMFO0olOiqKVto2MznJAcLJjtq2Ivp2y0MGbtoUZgLJjho3Wa
(19) J2JgM29hNGP0pmPjrLWup2NaoKBdMKkur2Jwq2z0NHcupVAhMKkip3Xb
(20) K2KhN29iOHQ0qnQksMXvq2ObpLCeNLlvs2Kxr2a0OIdvqWBiNLljq3Yc
(21) L2LiO29jPIR0roRltNYwr2PcqMDfOMmwt2Lys2b0PJewrXCjOMmkr3Zd
(22) M2MjP29kQJS0spSmuOZxs2QdrNEgPNnxu2Mzt2c0QKfxsYDkPNnls3Ae
(23) N2NkQ29lRKT0tqTnvPAyt2ResOFhQOoyv2Nau2d0RLgytZElQOomt3Bf
(24) O2OlR29mSLU0urUowQBzu2SftPGiRPpzw2Obv2e0SMhzuAFmRPpnu3Cg
(25) P2PmS29nTMV0vsVpxRCav2TguQHjSQqax2Pcw2f0TNiavBGnSQqov3Dh

# OpenVPN with x509 certificates

RSA key, CSR and DH parameter

# openssl genrsa -out server.key 2048
# openssl req -new -key server.key -out server.csr
# openssl genrsa -out client.key 2048
# openssl req -new -key client.key -out client.csr
# openssl dhparam -out dh2048.pem 2048

CA and signed certificates

# mkdir demoCA
# mkdir demoCA/private
# mkdir demoCA/newcerts
# echo '01' > demoCA/serial
# touch demoCA/index.txt
# openssl req -new -x509 -extensions v3_ca -keyout cakey.pem -out cacert.pem -days 3650
# mv cakey.pem demoCA/private/.
# cp cacert.pem demoCA/.
# openssl ca -in server.csr
# openssl ca -in client.csr
# cp demoCA/newcerts/01.pem server.pem
# cp demoCA/newcerts/02.pem client.pem

OpenVPN server configuration

# cat openvpn_server.conf
port 1194
proto udp
dev tun
ca cacert.pem
cert server.pem
key server.key
dh dh2048.pem
server 192.168.123.0 255.255.255.0
ifconfig-pool-persist ipp.txt
keepalive 10 120
persist-key
persist-tun
status openvpn-status.log
verb 3
mute 20
user nobody
group nogroup
# openvpn openvpn_server.conf

OpenVPN client configuration

# cat openvpn_client.conf
client
port 1194
proto udp
dev tun
ca cacert.pem
cert client.pem
key client.key
remote 1.2.3.4 1194
keepalive 10 120
persist-key
persist-tun
status openvpn-status.log
verb 3
mute 20
user nobody
group nogroup
# openvpn openvpn_client.conf

OpenVPN Android client configuration - Import profile

# cat openvpn_client.ovpn
client
port 1194
proto udp
dev tun
<ca>
// grep -A 100 'BEGIN CERTIFICATE' cacert.pem | grep -B 100 'END CERTIFICATE'
</ca>
<cert>
// grep -A 100 'BEGIN CERTIFICATE' client.pem | grep -B 100 'END CERTIFICATE'
</cert>
<key>
// grep -A 100 'BEGIN RSA PRIVATE KEY' client.key | grep -B 100 'END RSA PRIVATE KEY'
</key>
remote 1.2.3.4 1194
keepalive 10 120
persist-key
persist-tun
status openvpn-status.log
verb 3
mute 20
user nobody
group nogroup
# Import openvpn_client.ovpn