$ ./hashcat -m 16500 hash.txt -a 3 -w 3 ?a?a?a?a?a?a
hashcat (v4.0.1-95-gce0cee0a) starting...

OpenCL Platform #1: NVIDIA Corporation
======================================
* Device #1: GeForce GTX 1080, 2026/8107 MB allocatable, 20MCU
* Device #2: GeForce GTX 1080, 2028/8114 MB allocatable, 20MCU
* Device #3: GeForce GTX 1080, 2028/8114 MB allocatable, 20MCU
* Device #4: GeForce GTX 1080, 2028/8114 MB allocatable, 20MCU

Hashes: 1 digests; 1 unique digests, 1 unique salts
Bitmaps: 16 bits, 65536 entries, 0x0000ffff mask, 262144 bytes, 5/13 rotates

Applicable optimizers:
* Zero-Byte
* Not-Iterated
* Single-Hash
* Single-Salt
* Brute-Force

Password length minimum: 0
Password length maximum: 256

Watchdog: Temperature abort trigger set to 90c

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMj...Fh7HgQ:secret

Session..........: hashcat
Status...........: Cracked
Hash.Type........: JWT (JSON Web Token)
Hash.Target......: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMj...Fh7HgQ
Time.Started.....: Sun Jan 21 20:00:23 2018 (25 secs)
Time.Estimated...: Sun Jan 21 20:00:48 2018 (0 secs)
Guess.Mask.......: ?a?a?a?a?a?a [6]
Guess.Queue......: 1/1 (100.00%)
Speed.Dev.#1.....:   365.7 MH/s (55.80ms)
Speed.Dev.#2.....:   363.2 MH/s (56.49ms)
Speed.Dev.#3.....:   369.0 MH/s (55.27ms)
Speed.Dev.#4.....:   366.1 MH/s (55.72ms)
Speed.Dev.#*.....:  1464.0 MH/s
Recovered........: 1/1 (100.00%) Digests, 1/1 (100.00%) Salts
Progress.........: 36961382400/735091890625 (5.03%)
Rejected.........: 0/36961382400 (0.00%)
Restore.Point....: 3686400/81450625 (4.53%)
Candidates.#1....: sa@z"$ -> keKcet
Candidates.#2....: O%~vYB -> _ \fWN
Candidates.#3....: 86=>YB -> ut/* $
Candidates.#4....: sa.xia -> keM;fl
HWMon.Dev.#1.....: Temp: 51c Fan: 33% Util:100% Core:1885MHz Mem:4513MHz Bus:1
HWMon.Dev.#2.....: Temp: 57c Fan: 36% Util:100% Core:1860MHz Mem:4513MHz Bus:1
HWMon.Dev.#3.....: Temp: 55c Fan: 35% Util:100% Core:1898MHz Mem:4513MHz Bus:1
HWMon.Dev.#4.....: Temp: 58c Fan: 36% Util:100% Core:1873MHz Mem:4513MHz Bus:1

Started: Sun Jan 21 20:00:12 2018
Stopped: Sun Jan 21 20:00:49 2018