diff --git a/externals/wordlist/LICENSE.txt b/externals/wordlist/LICENSE.txt
new file mode 100644
index 0000000000..26d7b1666b
--- /dev/null
+++ b/externals/wordlist/LICENSE.txt
@@ -0,0 +1,15 @@
+The following copyright statement applies to this wordlists collection as a whole:
+Copyright (c) 2002,2003 by Solar Designer of Openwall Project
+
+The homepage URL for this wordlists collection is:
+
+http://www.openwall.com/wordlists/
+
+You're allowed to use and redistribute this wordlists collection or parts thereof, with or without modification, provided that credit is given where it is due, any modified versions are marked as such, this license is kept intact and included with each copy, and NO FEE IS CHARGED FOR OBTAINING A COPY except as negotiated with the copyright holder. In particular, you are NOT permitted to charge for bandwidth, physical media, and/or shipping. You're also not permitted to bundle this wordlists collection with a product you charge for.
+
+If redistribution for a fee is what you're after, please contact the copyright holder to negotiate special terms for the downloadable or the extended CD-ready version of this collection.
+
+It was a significant amount of work to compile this collection and having a monopoly on regulating the CD sales is my way to compensate for the time already spent and to allow for further work.
+
+--
+Alexander Peslyak aka Solar Designer <solar at openwall.com>
\ No newline at end of file
diff --git a/externals/wordlist/password.lst b/externals/wordlist/password.lst
new file mode 100644
index 0000000000..3c75bf2e05
--- /dev/null
+++ b/externals/wordlist/password.lst
@@ -0,0 +1,3557 @@
+#!comment: This list has been compiled by Solar Designer of Openwall Project,
+#!comment: http://www.openwall.com/wordlists/
+#!comment:
+#!comment: This list is based on passwords most commonly seen on a set of Unix
+#!comment: systems in mid-1990's, sorted for decreasing number of occurrences
+#!comment: (that is, more common passwords are listed first).  It has been
+#!comment: revised to also include common website passwords from public lists
+#!comment: of "top N passwords" from major community website compromises that
+#!comment: occurred in 2006 through 2010.
+#!comment:
+#!comment: Last update: 2011/11/20 (3546 entries)
+123456
+12345
+password
+password1
+123456789
+12345678
+1234567890
+abc123
+computer
+tigger
+1234
+qwerty
+money
+carmen
+mickey
+secret
+summer
+internet
+a1b2c3
+123
+service
+
+canada
+hello
+ranger
+shadow
+baseball
+donald
+harley
+hockey
+letmein
+maggie
+mike
+mustang
+snoopy
+buster
+dragon
+jordan
+michael
+michelle
+mindy
+patrick
+123abc
+andrew
+bear
+calvin
+changeme
+diamond
+fuckme
+fuckyou
+matthew
+miller
+tiger
+trustno1
+alex
+apple
+avalon
+brandy
+chelsea
+coffee
+falcon
+freedom
+gandalf
+green
+helpme
+linda
+magic
+merlin
+newyork
+soccer
+thomas
+wizard
+asdfgh
+bandit
+batman
+boris
+butthead
+dorothy
+eeyore
+fishing
+football
+george
+happy
+iloveyou
+jennifer
+jonathan
+love
+marina
+master
+missy
+monday
+monkey
+natasha
+ncc1701
+pamela
+pepper
+piglet
+poohbear
+pookie
+rabbit
+rachel
+rocket
+rose
+smile
+sparky
+spring
+steven
+success
+sunshine
+victoria
+whatever
+zapata
+8675309
+amanda
+andy
+angel
+august
+barney
+biteme
+boomer
+brian
+casey
+cowboy
+delta
+doctor
+fisher
+island
+john
+joshua
+karen
+marley
+orange
+please
+rascal
+richard
+sarah
+scooter
+shalom
+silver
+skippy
+stanley
+taylor
+welcome
+zephyr
+111111
+aaaaaa
+access
+albert
+alexander
+andrea
+anna
+anthony
+asdfjkl;
+ashley
+basketball
+beavis
+black
+bob
+booboo
+bradley
+brandon
+buddy
+caitlin
+camaro
+charlie
+chicken
+chris
+cindy
+cricket
+dakota
+dallas
+daniel
+david
+debbie
+dolphin
+elephant
+emily
+friend
+fucker
+ginger
+goodluck
+hammer
+heather
+iceman
+jason
+jessica
+jesus
+joseph
+jupiter
+justin
+kevin
+knight
+lacrosse
+lakers
+lizard
+madison
+mary
+mother
+muffin
+murphy
+nirvana
+paris
+pentium
+phoenix
+picture
+rainbow
+sandy
+saturn
+scott
+shannon
+shithead
+skeeter
+sophie
+special
+stephanie
+stephen
+steve
+sweetie
+teacher
+tennis
+test
+test123
+tommy
+topgun
+tristan
+wally
+william
+wilson
+1q2w3e
+654321
+666666
+a12345
+a1b2c3d4
+alpha
+amber
+angela
+angie
+archie
+asdf
+blazer
+bond007
+booger
+charles
+christin
+claire
+control
+danny
+david1
+dennis
+digital
+disney
+edward
+elvis
+felix
+flipper
+franklin
+frodo
+honda
+horses
+hunter
+indigo
+james
+jasper
+jeremy
+julian
+kelsey
+killer
+lauren
+marie
+maryjane
+matrix
+maverick
+mayday
+mercury
+mitchell
+morgan
+mountain
+niners
+nothing
+oliver
+peace
+peanut
+pearljam
+phantom
+popcorn
+princess
+psycho
+pumpkin
+purple
+randy
+rebecca
+reddog
+robert
+rocky
+roses
+salmon
+samson
+sharon
+sierra
+smokey
+startrek
+steelers
+stimpy
+sunflower
+superman
+support
+sydney
+techno
+walter
+willie
+willow
+winner
+ziggy
+zxcvbnm
+alaska
+alexis
+alice
+animal
+apples
+barbara
+benjamin
+billy
+blue
+bluebird
+bobby
+bonnie
+bubba
+camera
+chocolate
+clark
+claudia
+cocacola
+compton
+connect
+cookie
+cruise
+douglas
+dreamer
+dreams
+duckie
+eagles
+eddie
+einstein
+enter
+explorer
+faith
+family
+ferrari
+flamingo
+flower
+foxtrot
+francis
+freddy
+friday
+froggy
+giants
+gizmo
+global
+goofy
+happy1
+hendrix
+henry
+herman
+homer
+honey
+house
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+iguana
+indiana
+insane
+inside
+irish
+ironman
+jake
+jasmin
+jeanne
+jerry
+joey
+justice
+katherine
+kermit
+kitty
+koala
+larry
+leslie
+logan
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+mark
+martin
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+misty
+mitch
+mouse
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+nascar
+nelson
+pantera
+parker
+penguin
+peter
+piano
+pizza
+prince
+punkin
+pyramid
+raymond
+robin
+roger
+rosebud
+route66
+royal
+running
+sadie
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+sheena
+sheila
+skiing
+snapple
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+spencer
+spike
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+theresa
+thunderbird
+tigers
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+travel
+tuesday
+victory
+viper1
+wesley
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+winnie
+winter
+wolves
+xyz123
+zorro
+123123
+1234567
+696969
+888888
+Anthony
+Joshua
+Matthew
+Tigger
+aaron
+abby
+abcdef
+adidas
+adrian
+alfred
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+badger
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+bubba1
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+buffy
+button
+buttons
+cactus
+candy
+captain
+carlos
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+casper
+catch22
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+cheese
+cheryl
+chloe
+chris1
+clancy
+compaq
+conrad
+cooper
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+crawford
+crystal
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+cyclone
+dance
+diablo
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+dundee
+elizabeth
+eric
+europe
+farmer
+firebird
+fletcher
+fluffy
+france
+freak1
+friends
+fuckoff
+gabriel
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+garnet
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+guitar
+hacker
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+icecream
+imagine
+impala
+jack
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+jasmine
+jason1
+jeanette
+jeffrey
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+jenni
+jesus1
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+joker
+julie
+julie1
+junior
+justin1
+kathleen
+keith
+kelly
+kelly1
+kennedy
+kevin1
+knicks
+larry1
+leonard
+lestat
+library
+lincoln
+lionking
+london
+louise
+lucky1
+lucy
+maddog
+margaret
+mariposa
+marlboro
+martin1
+marty
+master1
+mensuck
+mercedes
+metal
+midori
+mikey
+millie
+mirage
+molly
+monet
+money1
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+monopoly
+mookie
+moose
+moroni
+music
+naomi
+nathan
+nguyen
+nicholas
+nicole
+nimrod
+october
+olive
+olivia
+online
+oscar
+oxford
+pacific
+painter
+peaches
+penelope
+pepsi
+petunia
+philip
+phoenix1
+photo
+pickle
+player
+poiuyt
+porsche
+porter
+puppy
+python
+quality
+raquel
+raven
+remember
+robbie
+robert1
+roman
+rugby
+runner
+russell
+ryan
+sailing
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+samantha
+savage
+scarlett
+school
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+shadow1
+sheba
+shelby
+shit
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+simba
+simple
+skipper
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+snake
+snickers
+sniper
+snoopdog
+snowman
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+stella
+stingray
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+stupid
+sunny1
+sunrise
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+susan
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+tanya
+teddy1
+theboss
+theking
+thumper
+tina
+tintin
+tomcat
+trebor
+trevor
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+unicorn
+valentine
+valerie
+vanilla
+veronica
+victor
+vincent
+viper
+warrior
+warriors
+weasel
+wheels
+wilbur
+winston
+wisdom
+wombat
+xavier
+yellow
+zeppelin
+1111
+1212
+Andrew
+Family
+Friends
+Michael
+Michelle
+Snoopy
+abcd1234
+abcdefg
+abigail
+account
+adam
+alex1
+alice1
+allison
+alpine
+andre1
+andrea1
+angel1
+anita
+annette
+antares
+apache
+apollo
+aragorn
+arizona
+arnold
+arsenal
+asdfasdf
+asdfg
+asdfghjk
+avenger
+baby
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+bailey
+banana
+barry
+basket
+batman1
+beaner
+beast
+beatrice
+bella
+bertha
+bigben
+bigdog
+biggles
+bigman
+binky
+biology
+bishop
+blondie
+bluefish
+bobcat
+bosco
+braves
+brazil
+bruce
+bruno
+brutus
+buffalo
+bulldog
+bullet
+bullshit
+bunny
+business
+butch
+butler
+butter
+california
+carebear
+carol
+carol1
+carole
+cassie
+castle
+catalina
+catherine
+cccccc
+celine
+center
+champion
+chanel
+chaos
+chelsea1
+chester1
+chicago
+chico
+christian
+christy
+church
+cinder
+colleen
+colorado
+columbia
+commander
+connie
+cookies
+cooking
+corona
+cowboys
+coyote
+craig
+creative
+cuddles
+cuervo
+cutie
+daddy
+daisy
+daniel1
+danielle
+davids
+death
+denis
+derek
+design
+destiny
+diana
+diane
+dickhead
+digger
+dodger
+donna
+dougie
+dragonfly
+dylan
+eagle
+eclipse
+electric
+emerald
+etoile
+excalibur
+express
+fender
+fiona
+fireman
+flash
+florida
+flowers
+foster
+francesco
+francine
+francois
+frank
+french
+fuckface
+gemini
+general
+gerald
+germany
+gilbert
+goaway
+golden
+goldfish
+goose
+gordon
+graham
+grant
+gregory
+gretchen
+gunner
+hannah
+harold
+harrison
+harvey
+hawkeye
+heaven
+heidi
+helen
+helena
+hithere
+hobbit
+ibanez
+idontknow
+integra
+ireland
+irene
+isaac
+isabel
+jackass
+jackie
+jackson
+jaguar
+jamaica
+japan
+jenny1
+jessie
+johan
+johnny
+joker1
+jordan23
+judith
+julia
+jumanji
+kangaroo
+karen1
+kathy
+keepout
+keith1
+kenneth
+kimberly
+kingdom
+kitkat
+kramer
+kristen
+laura
+laurie
+lawrence
+lawyer
+legend
+liberty
+light
+lindsay
+lindsey
+lisa
+liverpool
+lola
+lonely
+louis
+lovely
+loveme
+lucas
+madonna
+malcolm
+malibu
+marathon
+marcel
+maria1
+mariah
+mariah1
+marilyn
+mario
+marvin
+maurice
+maxine
+maxwell
+me
+meggie
+melanie
+melissa
+melody
+mexico
+michael1
+michele
+midnight
+mike1
+miracle
+misha
+mishka
+molly1
+monique
+montreal
+moocow
+moore
+morris
+mouse1
+mulder
+nautica
+nellie
+newton
+nick
+nirvana1
+nissan
+norman
+notebook
+ocean
+olivier
+ollie
+oranges
+oregon
+orion
+panda
+pandora
+panther
+passion
+patricia
+pearl
+peewee
+pencil
+penny
+people
+percy
+person
+peter1
+petey
+picasso
+pierre
+pinkfloyd
+polaris
+police
+pookie1
+poppy
+power
+predator
+preston
+q1w2e3
+queen
+queenie
+quentin
+ralph
+random
+rangers
+raptor
+reality
+redrum
+remote
+reynolds
+rhonda
+ricardo
+ricardo1
+ricky
+river
+roadrunner
+robinhood
+rocknroll
+rocky1
+ronald
+roxy
+ruthie
+sabrina
+sakura
+sally
+sampson
+samuel
+sandra
+santa
+sapphire
+scarlet
+scorpio
+scott1
+scottie
+scruffy
+seattle
+serena
+shanti
+shark
+shogun
+simon
+singer
+skull
+skywalker
+slacker
+smashing
+smiles
+snowflake
+snuffy
+soccer1
+soleil
+sonny
+spanky
+speedy
+spider
+spooky
+stacey
+star69
+start
+steven1
+stinky
+strawberry
+stuart
+sugar
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+superfly
+suzanne
+suzuki
+swimmer
+swimming
+system
+taffy
+tarzan
+teddy
+teddybear
+terry
+theatre
+thunder
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+tinker
+tootsie
+tornado
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+tricia
+trident
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+tucker
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+tyler
+utopia
+voyager
+warcraft
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+warren
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+wayne
+wendy
+williams
+willy
+winona
+woody
+woofwoof
+wrangler
+wright
+xfiles
+xxxxxx
+yankees
+yvonne
+zebra
+zenith
+zigzag
+zombie
+zxc123
+zxcvb
+000000
+007007
+11111
+11111111
+123321
+171717
+181818
+1a2b3c
+1chris
+4runner
+54321
+55555
+6969
+7777777
+789456
+88888888
+Alexis
+Bailey
+Charlie
+Chris
+Daniel
+Dragon
+Elizabeth
+HARLEY
+Heather
+Jennifer
+Jessica
+Jordan
+KILLER
+Nicholas
+Password
+Princess
+Purple
+Rebecca
+Robert
+Shadow
+Steven
+Summer
+Sunshine
+Superman
+Taylor
+Thomas
+Victoria
+abcd123
+abcde
+accord
+active
+africa
+airborne
+alfaro
+alicia
+aliens
+alina
+aline
+alison
+allen
+aloha
+alpha1
+althea
+altima
+amanda1
+amazing
+america
+amour
+anderson
+andre
+andrew1
+andromeda
+angels
+angie1
+annie
+anything
+apple1
+apple2
+applepie
+april
+aquarius
+ariane
+ariel
+arlene
+artemis
+asdf1234
+asdfjkl
+ashley1
+ashraf
+ashton
+asterix
+attila
+autumn
+avatar
+babes
+bambi
+barbie
+barney1
+barrett
+bball
+beaches
+beanie
+beans
+beauty
+becca
+belize
+belle
+belmont
+benji
+benson
+bernardo
+berry
+betsy
+betty
+bigboss
+bigred
+billy1
+birdie
+birthday
+biscuit
+bitter
+blackjack
+blah
+blanche
+blood
+blowjob
+blowme
+blueeyes
+blues
+bogart
+bombay
+boobie
+boots
+bootsie
+boxers
+brandi
+brent
+brewster
+bridge
+bronco
+bronte
+brooke
+brother
+bryan
+bubble
+buddha
+budgie
+burton
+butterfly
+byron
+calendar
+calvin1
+camel
+camille
+campbell
+camping
+cancer
+canela
+cannon
+carbon
+carnage
+carolyn
+carrot
+cascade
+catfish
+cathy
+catwoman
+cecile
+celica
+change
+chantal
+charger
+cherry
+chiara
+chiefs
+china
+chris123
+christ1
+christmas
+christopher
+chuck
+cindy1
+cinema
+civic
+claude
+clueless
+cobain
+cobra
+cody
+colette
+college
+colors
+colt45
+confused
+cool
+corvette
+cosmo
+country
+crusader
+cunningham
+cupcake
+cynthia
+dagger
+dammit
+dancer
+daphne
+darkstar
+darren
+darryl
+darwin
+deborah
+december
+deedee
+deeznuts
+delano
+delete
+demon
+denise
+denny
+desert
+deskjet
+detroit
+devil
+devine
+devon
+dexter
+dianne
+diesel
+director
+dixie
+dodgers
+doggy
+dollar
+dolly
+dominique
+domino
+dontknow
+doogie
+doudou
+downtown
+dragon1
+driver
+dude
+dudley
+dutchess
+dwight
+eagle1
+easter
+eastern
+edith
+edmund
+eight
+element
+elissa
+ellen
+elliot
+empire
+enigma
+enterprise
+erin
+escort
+estelle
+eugene
+evelyn
+explore
+family1
+fatboy
+felipe
+ferguson
+ferret
+ferris
+fireball
+fishes
+fishie
+flight
+florida1
+flowerpot
+forward
+freddie
+freebird
+freeman
+frisco
+fritz
+froggie
+froggies
+frogs
+fucku
+future
+gabby
+games
+garcia
+gaston
+gateway
+george1
+georgia
+german
+germany1
+getout
+ghost
+gibson
+giselle
+gmoney
+goblin
+goblue
+gollum
+grandma
+gremlin
+grizzly
+grumpy
+guess
+guitar1
+gustavo
+haggis
+haha
+hailey
+halloween
+hamilton
+hamlet
+hanna
+hanson
+happy123
+happyday
+hardcore
+harley1
+harriet
+harris
+harvard
+health
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+huang
+hugo
+hydrogen
+ib6ub9
+insight
+instructor
+integral
+iomega
+iris
+izzy
+jazz
+jean
+jeepster
+jetta1
+joanie
+josee
+joy
+julia2
+jumbo
+jump
+justice4
+kalamazoo
+kali
+kat
+kate
+kerala
+kids
+kiwi
+kleenex
+kombat
+lamer
+laser
+laserjet
+lassie1
+leblanc
+legal
+leo
+life
+lions
+liz
+logger
+logos
+loislane
+loki
+longer
+lori
+lost
+lotus
+lou
+macha
+macross
+madoka
+makeitso
+mallard
+marc
+math
+mattingly
+mechanic
+meister
+mercer
+merde
+merrill
+michal
+michou
+mickel
+minou
+mobydick
+modem
+mojo
+montana3
+montrose
+motor
+mowgli
+mulder1
+muscle
+neil
+neutrino
+newaccount
+nicklaus
+nightshade
+nightwing
+nike
+none1
+nopass
+nouveau
+novell
+oaxaca
+obiwan
+obsession
+orville
+otter
+ozzy
+packrat
+paint
+papa
+paradigm
+pass
+pavel
+peterk
+phialpha
+phishy
+piano1
+pianoman
+pianos
+pipeline
+plato
+play
+poetic
+print
+printing
+provider
+qqq111
+quebec
+qwer
+racer
+racerx
+radar
+rafiki
+raleigh
+rasta1
+redcloud
+redfish
+redwing
+redwood
+reed
+rene
+reznor
+rhino
+ripple
+rita
+robocop
+robotics
+roche
+roni
+rossignol
+rugger
+safety1
+saigon
+satori
+saturn5
+schnapps
+scotch
+scuba
+secret3
+seeker
+services
+sex
+shanghai
+shazam
+shelter
+sigmachi
+signal
+signature
+simsim
+skydive
+slick
+smegma
+smiths
+smurfy
+snow
+sober1
+sonics
+sony
+spazz
+sphynx
+spock
+spoon
+spot
+sprocket
+starbuck
+steel
+stephi
+sting
+stocks
+storage
+strat
+strato
+stud
+student2
+susanna
+swanson
+swim
+switzer
+system5
+t-bone
+talon
+tarheel
+tata
+tazdevil
+tester
+testtest
+thisisit
+thorne
+tightend
+tim
+tom
+tool
+total
+toucan
+transfer
+transit
+transport
+trapper
+trash
+trophy
+tucson
+turbo2
+unity
+upsilon
+vedder
+vette
+vikram
+virago
+visual
+volcano
+walden
+waldo
+walleye
+webmaster
+wedge
+whale1
+whit
+whoville
+wibble
+will
+wombat1
+word
+world
+x-files
+xxx123
+zack
+zepplin
+zoltan
+zoomer
+123go
+21122112
+5555
+911
+FuckYou
+Fuckyou
+Gizmo
+Hello
+Michel
+Qwerty
+Windows
+angus
+aspen
+ass
+bird
+booster
+byteme
+cats
+changeit
+christia
+christoph
+classroom
+cloclo
+corrado
+dasha
+fiction
+french1
+fubar
+gator
+gilles
+gocougs
+hilbert
+hola
+home
+judy
+koko
+lulu
+mac
+macintosh
+mailer
+mars
+meow
+ne1469
+niki
+paul
+politics
+pomme
+property
+ruth
+sales
+salut
+scrooge
+skidoo
+spain
+surf
+sylvie
+symbol
+forum
+rotimi
+god
+saved
+2580
+1998
+xxx
+1928
+777
+info
+a
+netware
+sun
+tech
+doom
+mmm
+one
+ppp
+1911
+1948
+1996
+5252
+Champs
+Tuesday
+bach
+crow
+don
+draft
+hal9000
+herzog
+huey
+jethrotull
+jussi
+mail
+miki
+nicarao
+snowski
+1316
+1412
+1430
+1952
+1953
+1955
+1956
+1960
+1964
+1qw23e
+22
+2200
+2252
+3010
+3112
+4788
+6262
+Alpha
+Bastard
+Beavis
+Cardinal
+Celtics
+Cougar
+Darkman
+Figaro
+Fortune
+Geronimo
+Hammer
+Homer
+Janet
+Mellon
+Merlot
+Metallic
+Montreal
+Newton
+Paladin
+Peanuts
+Service
+Vernon
+Waterloo
+Webster
+aki123
+aqua
+aylmer
+beta
+bozo
+car
+chat
+chinacat
+cora
+courier
+dogbert
+eieio
+elina1
+fly
+funguy
+fuzz
+ggeorge
+glider1
+gone
+hawk
+heikki
+histoire
+hugh
+if6was9
+ingvar
+jan
+jedi
+jimi
+juhani
+khan
+lima
+midvale
+neko
+nesbit
+nexus6
+nisse
+notta1
+pam
+park
+pole
+pope
+pyro
+ram
+reliant
+rex
+rush
+seoul
+skip
+stan
+sue
+suzy
+tab
+testi
+thelorax
+tika
+tnt
+toto1
+tre
+wind
+x-men
+xyz
+zxc
+369
+Abcdef
+Asdfgh
+Changeme
+NCC1701
+Zxcvbnm
+demo
+doom2
+e
+good-luck
+homebrew
+m1911a1
+nat
+ne1410s
+ne14a69
+zhongguo
+sample123
+0852
+basf
+OU812
+!@#$%
+informix
+majordomo
+news
+temp
+trek
+!@#$%^
+!@#$%^&*
+Pentium
+Raistlin
+adi
+bmw
+law
+m
+new
+opus
+plus
+visa
+www
+y
+zzz
+1332
+1950
+3141
+3533
+4055
+4854
+6301
+Bonzo
+ChangeMe
+Front242
+Gretel
+Michel1
+Noriko
+Sidekick
+Sverige
+Swoosh
+Woodrow
+aa
+ayelet
+barn
+betacam
+biz
+boat
+cuda
+doc
+hal
+hallowell
+haro
+hosehead
+i
+ilmari
+irmeli
+j1l2t3
+jer
+kcin
+kerrya
+kissa2
+leaf
+lissabon
+mart
+matti1
+mech
+morecats
+paagal
+performa
+prof
+ratio
+ship
+slip
+stivers
+tapani
+targas
+test2
+test3
+tula
+unix
+user1
+xanth
+!@#$%^&
+1701d
+@#$%^&
+Qwert
+allo
+dirk
+go
+newcourt
+nite
+notused
+sss
diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
index d42da6bef5..532781ac7a 100644
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -1267,6 +1267,7 @@ phutil_register_library_map(array(
     'PhabricatorChatLogEvent' => 'applications/chatlog/storage/PhabricatorChatLogEvent.php',
     'PhabricatorChatLogEventType' => 'applications/chatlog/constants/PhabricatorChatLogEventType.php',
     'PhabricatorChatLogQuery' => 'applications/chatlog/PhabricatorChatLogQuery.php',
+    'PhabricatorCommonPasswords' => 'applications/auth/constants/PhabricatorCommonPasswords.php',
     'PhabricatorConduitAPIController' => 'applications/conduit/controller/PhabricatorConduitAPIController.php',
     'PhabricatorConduitCertificateToken' => 'applications/conduit/storage/PhabricatorConduitCertificateToken.php',
     'PhabricatorConduitConfigOptions' => 'applications/conduit/config/PhabricatorConduitConfigOptions.php',
@@ -3869,6 +3870,7 @@ phutil_register_library_map(array(
     ),
     'PhabricatorChatLogEventType' => 'PhabricatorChatLogConstants',
     'PhabricatorChatLogQuery' => 'PhabricatorCursorPagedPolicyAwareQuery',
+    'PhabricatorCommonPasswords' => 'Phobject',
     'PhabricatorConduitAPIController' => 'PhabricatorConduitController',
     'PhabricatorConduitCertificateToken' => 'PhabricatorConduitDAO',
     'PhabricatorConduitConfigOptions' => 'PhabricatorApplicationConfigOptions',
diff --git a/src/applications/auth/constants/PhabricatorCommonPasswords.php b/src/applications/auth/constants/PhabricatorCommonPasswords.php
new file mode 100644
index 0000000000..1313257553
--- /dev/null
+++ b/src/applications/auth/constants/PhabricatorCommonPasswords.php
@@ -0,0 +1,70 @@
+<?php
+
+/**
+ * Check if a password is extremely common. Preventing use of the most common
+ * passwords is an attempt to mitigate slow botnet attacks against an entire
+ * userbase. See T4143 for discussion.
+ *
+ * @task common Checking Common Passwords
+ */
+final class PhabricatorCommonPasswords extends Phobject {
+
+
+/* -(  Checking Common Passwords  )------------------------------------------ */
+
+
+  /**
+   * Check if a password is extremely common.
+   *
+   * @param   string  Password to test.
+   * @return  bool    True if the password is pathologically weak.
+   *
+   * @task common
+   */
+  public static function isCommonPassword($password) {
+    static $list;
+    if ($list === null) {
+      $list = self::loadWordlist();
+    }
+
+    return isset($list[strtolower($password)]);
+  }
+
+
+  /**
+   * Load the common password wordlist.
+   *
+   * @return map<string, bool>  Map of common passwords.
+   *
+   * @task common
+   */
+  private static function loadWordlist() {
+    $root = dirname(phutil_get_library_root('phabricator'));
+    $file = $root.'/externals/wordlist/password.lst';
+    $data = Filesystem::readFile($file);
+
+    $words = phutil_split_lines($data, $retain_endings = false);
+
+    $map = array();
+    foreach ($words as $key => $word) {
+      // The wordlist file has some comments at the top, strip those out.
+      if (preg_match('/^#!comment:/', $word)) {
+        continue;
+      }
+      $map[strtolower($word)] = true;
+    }
+
+    // Add in some application-specific passwords.
+    $map += array(
+      'phabricator' => true,
+      'phab' => true,
+      'devtools' => true,
+      'differential' => true,
+      'codereview' => true,
+      'review' => true,
+    );
+
+    return $map;
+  }
+
+}
diff --git a/src/applications/auth/controller/PhabricatorAuthRegisterController.php b/src/applications/auth/controller/PhabricatorAuthRegisterController.php
index 4b2c49cee4..3c8cbe2acb 100644
--- a/src/applications/auth/controller/PhabricatorAuthRegisterController.php
+++ b/src/applications/auth/controller/PhabricatorAuthRegisterController.php
@@ -182,6 +182,14 @@ final class PhabricatorAuthRegisterController
           $errors[] = pht(
             'Password is too short (must be at least %d characters long).',
             $min_len);
+        } else if (
+          PhabricatorCommonPasswords::isCommonPassword($value_password)) {
+
+          $e_password = pht('Very Weak');
+          $errors[] = pht(
+            'Password is pathologically weak. This password is one of the '.
+            'most common passwords in use, and is extremely easy for '.
+            'attackers to guess. You must choose a stronger password.');
         } else {
           $e_password = null;
         }
diff --git a/src/applications/diffusion/panel/DiffusionSetPasswordPanel.php b/src/applications/diffusion/panel/DiffusionSetPasswordPanel.php
index 22ebea500c..25684c1c2e 100644
--- a/src/applications/diffusion/panel/DiffusionSetPasswordPanel.php
+++ b/src/applications/diffusion/panel/DiffusionSetPasswordPanel.php
@@ -72,9 +72,19 @@ final class DiffusionSetPasswordPanel extends PhabricatorSettingsPanel {
           $e_password = pht('Not Unique');
           $e_confirm = pht('Not Unique');
           $errors[] = pht(
-            'This password is not unique. You must use a unique password.');
+            'This password is the same as another password associated '.
+            'with your account. You must use a unique password for '.
+            'VCS access.');
+        } else if (
+          PhabricatorCommonPasswords::isCommonPassword($new_password)) {
+          $e_password = pht('Very Weak');
+          $e_confirm = pht('Very Weak');
+          $errors[] = pht(
+            'This password is extremely weak: it is one of the most common '.
+            'passwords in use. Choose a stronger password.');
         }
 
+
         if (!$errors) {
           $vcspassword->setPassword($envelope, $user);
           $vcspassword->save();
diff --git a/src/applications/settings/panel/PhabricatorSettingsPanelPassword.php b/src/applications/settings/panel/PhabricatorSettingsPanelPassword.php
index e872437c02..dcc4d293a9 100644
--- a/src/applications/settings/panel/PhabricatorSettingsPanelPassword.php
+++ b/src/applications/settings/panel/PhabricatorSettingsPanelPassword.php
@@ -75,11 +75,15 @@ final class PhabricatorSettingsPanelPassword
       if (strlen($pass) < $min_len) {
         $errors[] = pht('Your new password is too short.');
         $e_new = pht('Too Short');
-      }
-
-      if ($pass !== $conf) {
+      } else if ($pass !== $conf) {
         $errors[] = pht('New password and confirmation do not match.');
         $e_conf = pht('Invalid');
+      } else if (PhabricatorCommonPasswords::isCommonPassword($pass)) {
+        $e_new = pht('Very Weak');
+        $e_conf = pht('Very Weak');
+        $errors[] = pht(
+          'Your new password is very weak: it is one of the most common '.
+          'passwords in use. Choose a stronger password.');
       }
 
       if (!$errors) {