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@tchen

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tchen

@tepelchen501

AUTHORED CHALLENGES

OPEN DATECHALLENGESOLVES

2026/04/06

No Content
Web
147 solves

2026/04/01

Message For You
Web
187 solves

2026/03/29

Tar Uploader
Web
101 solves

2026/03/28

Dot Chain
Misc
84 solves

2026/03/23

What's Next
Web
110 solves

2026/03/16

Free Coupon
Web
135 solves

2026/03/12

Another Login Challenge
Web
124 solves

2026/03/04

Alert my Flag
Web
167 solves

2026/03/04

Resume Maker
Web
53 solves

2026/02/26

Rock Paper Scissors Lizard Spock
Web
96 solves

2026/02/24

Alpaca Rangers
Web
148 solves

2026/02/14

You are being redirected
Web
113 solves

2026/02/08

Plz Login
Web
225 solves

2026/02/03

Magic Engine
Web
271 solves

2026/01/27

No JS
Web
132 solves

2026/01/24

Stateless Auth
Web
168 solves

2026/01/12

I wanna be the Admin
Web
283 solves

2025/12/25

Useful Machine
Rev
158 solves

2025/12/21

Log Viewer
Web
225 solves

CTF HISTORY

START DATECTFRANK

2025/05/17

AlpacaHack Round 11 (Web)
4 / 213

2025/03/23

AlpacaHack Round 10 (Pwn)
19 / 95

2025/03/01

SECCON CTF 13 決勝観戦CTF
11 / 233

2024/12/30

AlpacaHack Round 8 (Rev)
15 / 316

2024/11/30

AlpacaHack Round 7 (Web)
33 / 458

2024/11/03

AlpacaHack Round 6 (Pwn)
45 / 197

2024/10/12

AlpacaHack Round 5 (Crypto)
28 / 247

2024/09/15

AlpacaHack Round 3 (Crypto)
92 / 239

2024/08/18

AlpacaHack Round 1 (Pwn)
58 / 174

WRITEUPS

WRITEUPCREATED AT
Writeup for Tar Uploader
en
Tar Uploader

last week

Writeup for Dot Chain
en
Dot Chain

last week

Writeup for What's Next
en
What's Next

last week

Writeup for Free Coupon
en
Free Coupon

last week

Writeup for The past or the future?
ja
The past or the future?

2 weeks ago

Writeup for Resume Maker
en
Resume Maker

3 weeks ago

Writeup for Another Login Challenge
en
Another Login Challenge

3 weeks ago

Writeup for Alert my Flag
en
Alert my Flag

3 weeks ago

Writeup for Rock Paper Scissors Lizard Spock
en
Rock Paper Scissors Lizard Spock

3 weeks ago

Writeup for Alpaca Rangers
en
Alpaca Rangers

3 weeks ago

Writeup for You are being redirected
en
You are being redirected

3 weeks ago

Writeup for pyjs
en
pyjs

last month

Writeup for Plz Login
en
Plz Login

2 months ago

Writeup for Magic Engine
en
Magic Engine

2 months ago

Writeup for Inu Profile
en
Inu Profile

2 months ago

Author's Writeup for No JS
en
official
No JS

2 months ago

Author's Writeup for Stateless Auth
en
official
Stateless Auth

2 months ago

Author's Writeup for Useful Machine
en
official
Useful Machine

2 months ago

Author's Writeup for I wanna be the Admin
en
official
I wanna be the Admin

2 months ago

Author's Writeup for Log Viewer
en
official
Log Viewer

3 months ago

Writeup for AlpacaHack Round 7 (Web)
en
AlpacaHack Round 7 (Web)

last year

Writeup for pytecode
ja
pytecode

last year

SOLVED CHALLENGES

CHALLENGESOLVES

SOLVED AT

encrypted-p
Crypto
Daily AlpacaHack

100 solves

2 weeks ago

The past or the future?
Crypto
Daily AlpacaHack B-SIDE

33 solves

2 weeks ago

crypto_666
Crypto
Daily AlpacaHack

105 solves

2 weeks ago

bloom
Crypto
Daily AlpacaHack

86 solves

2 weeks ago

psfuck
Misc
tkbctf5

3 solves

3 weeks ago

Parallel and Buffet
Web
tkbctf5

56 solves

3 weeks ago

Secure Gate
Web
tkbctf5

69 solves

3 weeks ago

Patisserie
Web
tkbctf5

97 solves

3 weeks ago

Capture The F__l__a__g
Web
tkbctf5

19 solves

4 weeks ago

Capture The F__l__a__g Revenge
Web
tkbctf5

3 solves

4 weeks ago

Greeting
Web
tkbctf5

34 solves

4 weeks ago

Dream of You
Web
tkbctf5

27 solves

4 weeks ago

pyjs
Misc
Daily AlpacaHack

82 solves

last month

Inu Profile
Web
Daily AlpacaHack B-SIDE

95 solves

2 months ago

ChaChaCha
Crypto
Daily AlpacaHack

157 solves

2 months ago

Short Writer
Pwn
Daily AlpacaHack

124 solves

2 months ago

RSA2026
Crypto
Daily AlpacaHack

209 solves

3 months ago

Square RSA
Crypto
Daily AlpacaHack

235 solves

3 months ago

super-tomato
Crypto
Daily AlpacaHack

388 solves

3 months ago

Tiny Note
Web
AlpacaHack Round 11 (Web)

15 solves

11 months ago

Jackpot
Web
AlpacaHack Round 11 (Web)

163 solves

11 months ago

Kangaroo
Pwn
AlpacaHack Round 10 (Pwn)

66 solves

last year

Oyster
Pwn
AlpacaHack Round 10 (Pwn)

129 solves

last year

hidden
Rev
AlpacaHack Round 8 (Rev)

71 solves

last year

masking tape
Rev
AlpacaHack Round 8 (Rev)

173 solves

last year

echo
Pwn
AlpacaHack Round 1 (Pwn)

357 solves

last year

Alpaca Poll
Web
AlpacaHack Round 7 (Web)

129 solves

last year

Treasure Hunt
Web
AlpacaHack Round 7 (Web)

271 solves

last year

inbound
Pwn
AlpacaHack Round 6 (Pwn)

207 solves

last year

GitFile Explorer
Web
zer0pts CTF 2022

48 solves

last year

XorshiftStream
Crypto
AlpacaHack Round 5 (Crypto)

65 solves

last year

Simple Flag Checker
Rev
AlpacaHack Round 4 (Rev)

127 solves

last year

pytecode
Rev
AlpacaHack Round 4 (Rev)

26 solves

last year

Panda Memo
Web
CakeCTF 2022

3 solves

last year

Pico Note 2
Web
AlpacaHack Round 2 (Web)

8 solves

last year

Pico Note 1
Web
AlpacaHack Round 2 (Web)

81 solves

last year

Simple Login
Web
AlpacaHack Round 2 (Web)

611 solves

last year

CaaS
Web
AlpacaHack Round 2 (Web)

93 solves

last year

read-write
Pwn
RTACTF 2023 Spring

41 solves

last year

write
Pwn
RTACTF 2023 Spring

85 solves

last year

Reused-AES
Crypto
RTACTF 2023 Spring

33 solves

last year

XOR-CBC
Crypto
RTACTF 2023 Spring

77 solves

last year

before-write
Pwn
RTACTF 2023 Spring

162 solves

last year

Welcome
Misc

1544 solves

last year

Neko Note
Web
zer0pts CTF 2023

9 solves

last year

OpenBio 2
Web
CakeCTF 2023

7 solves

last year

readme 2022
Misc
CakeCTF 2022

14 solves

last year

OpenBio
Web
CakeCTF 2022

21 solves

last year

jqi
Web
zer0pts CTF 2023

14 solves

last year

Warmuprofile
Web
zer0pts CTF 2023

28 solves

last year

AdBlog
Web
CakeCTF 2023

11 solves

last year

CakeGEAR
Web
CakeCTF 2022

81 solves

last year

TOWFL
WebCheat
CakeCTF 2023

51 solves

last year

Country DB
Web
CakeCTF 2023

224 solves

last year