diff --git a/main/ui/src/main/java/org/cryptomator/ui/keyrecovery/WordEncoder.java b/main/ui/src/main/java/org/cryptomator/ui/keyrecovery/WordEncoder.java
new file mode 100644
index 000000000..d5d3dc091
--- /dev/null
+++ b/main/ui/src/main/java/org/cryptomator/ui/keyrecovery/WordEncoder.java
@@ -0,0 +1,97 @@
+package org.cryptomator.ui.keyrecovery;
+
+import com.google.common.base.Preconditions;
+import com.google.common.base.Splitter;
+
+import java.io.BufferedReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.io.Reader;
+import java.nio.charset.StandardCharsets;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+import java.util.stream.IntStream;
+
+class WordEncoder {
+
+	private static final int WORD_COUNT = 4096;
+	private static final char DELIMITER = ' ';
+	
+	private final List<String> words;
+	private final Map<String, Integer> indices;
+	
+	public WordEncoder() {
+		this("/i18n/4096words_en.txt");
+	}
+	
+	public WordEncoder(String wordFile) {
+		try (InputStream in = getClass().getResourceAsStream(wordFile); //
+			 Reader reader = new InputStreamReader(in, StandardCharsets.US_ASCII.newDecoder()); //
+			 BufferedReader bufferedReader = new BufferedReader(reader)) {
+			this.words = bufferedReader.lines().limit(WORD_COUNT).collect(Collectors.toUnmodifiableList());
+		} catch (IOException e) {
+			throw new IllegalArgumentException("Unreadable file: " + wordFile, e);
+		}
+		if (words.size() < WORD_COUNT) {
+			throw new IllegalArgumentException("Insufficient input file: " + wordFile);
+		}
+		this.indices = Map.ofEntries(IntStream.range(0, WORD_COUNT).mapToObj(i -> Map.entry(words.get(i), i)).toArray(Map.Entry[]::new));
+	}
+
+	/**
+	 * Encodes the given input as a sequence of words.
+	 * @param input A multiple of three bytes
+	 * @return A String that can be {@link #decode(String) decoded} to the input again.
+	 * @throws IllegalArgumentException If input is not a multiple of three bytes
+	 */
+	public String encodePadded(byte[] input) {
+		Preconditions.checkArgument(input.length % 3 == 0, "input needs to be padded to a multipe of three");
+		StringBuilder sb = new StringBuilder();
+		for (int i = 0; i < input.length; i+=3) {
+			byte b1 = input[i];
+			byte b2 = input[i+1];
+			byte b3 = input[i+2];
+			int firstWordIndex = (0xFF0 & (b1 << 4)) + (0x00F & (b2 >> 4)); // 0xFFF000
+			int secondWordIndex = (0xF00 & (b2 << 8)) + (0x0FF & b3); // 0x000FFF
+			assert firstWordIndex < WORD_COUNT;
+			assert secondWordIndex < WORD_COUNT;
+			sb.append(words.get(firstWordIndex)).append(DELIMITER);
+			sb.append(words.get(secondWordIndex)).append(DELIMITER);
+		}
+		if (sb.length() > 0) {
+			sb.setLength(sb.length() - 1); // remove last space
+		}
+		return sb.toString();
+	}
+
+	/**
+	 * Decodes a String that has previously been {@link #encodePadded(byte[]) encoded} to a word sequence.
+	 * @param encoded The word sequence
+	 * @return Decoded bytes
+	 * @throws IllegalArgumentException If the encoded string doesn't consist of a multiple of two words or one of the words is unknown to this encoder.
+	 */
+	public byte[] decode(String encoded) {
+		List<String> splitted = Splitter.on(DELIMITER).omitEmptyStrings().splitToList(encoded);
+		Preconditions.checkArgument(splitted.size() % 2 == 0, "%s needs to be a multiple of two words", encoded);
+		byte[] result = new byte[splitted.size() / 2 * 3];
+		for (int i = 0; i < splitted.size(); i+=2) {
+			String w1 = splitted.get(i);
+			String w2 = splitted.get(i+1);
+			int firstWordIndex = indices.getOrDefault(w1, -1);
+			int secondWordIndex = indices.getOrDefault(w2, -1);
+			Preconditions.checkArgument(firstWordIndex != -1, "%s not in dictionary", w1);
+			Preconditions.checkArgument(secondWordIndex != -1, "%s not in dictionary", w2);
+			byte b1 = (byte) (0xFF & (firstWordIndex >> 4));
+			byte b2 = (byte) ((0xF0 & (firstWordIndex << 4)) + (0x0F & (secondWordIndex >> 8)));
+			byte b3 = (byte) (0xFF & secondWordIndex);
+			result[i/2*3] = b1;
+			result[i/2*3+1] = b2;
+			result[i/2*3+2] = b3;
+		}
+		return result;
+	}
+	
+
+}
diff --git a/main/ui/src/main/resources/i18n/4096words_en.txt b/main/ui/src/main/resources/i18n/4096words_en.txt
new file mode 100644
index 000000000..7e5945149
--- /dev/null
+++ b/main/ui/src/main/resources/i18n/4096words_en.txt
@@ -0,0 +1,4096 @@
+the
+of
+and
+to
+in
+i
+that
+was
+his
+he
+it
+with
+is
+for
+as
+had
+you
+not
+be
+her
+on
+at
+by
+which
+have
+or
+from
+this
+him
+but
+all
+she
+they
+were
+my
+are
+me
+one
+their
+so
+an
+said
+them
+we
+who
+would
+been
+will
+no
+when
+there
+if
+more
+out
+up
+into
+do
+any
+your
+what
+has
+man
+could
+other
+than
+our
+some
+very
+time
+upon
+about
+may
+its
+only
+now
+like
+little
+then
+can
+should
+made
+did
+us
+such
+a
+great
+before
+must
+two
+these
+see
+know
+over
+much
+down
+after
+first
+Mr
+good
+men
+own
+never
+most
+old
+shall
+day
+where
+those
+came
+come
+himself
+way
+work
+life
+without
+go
+make
+well
+through
+being
+long
+say
+might
+how
+am
+too
+even
+def
+again
+many
+back
+here
+think
+every
+people
+went
+same
+last
+thought
+away
+under
+take
+found
+hand
+eyes
+still
+place
+while
+just
+also
+young
+yet
+though
+against
+things
+get
+ever
+give
+god
+years
+off
+face
+nothing
+right
+once
+another
+left
+part
+saw
+house
+world
+head
+three
+took
+new
+love
+always
+Mrs
+put
+night
+each
+king
+between
+tell
+mind
+heart
+few
+because
+thing
+whom
+far
+seemed
+looked
+called
+whole
+de
+set
+both
+got
+find
+done
+heard
+look
+name
+days
+told
+let
+lord
+country
+asked
+going
+seen
+better
+p
+having
+home
+knew
+side
+something
+moment
+father
+among
+course
+hands
+woman
+enough
+words
+mother
+soon
+full
+end
+gave
+room
+almost
+small
+thou
+cannot
+water
+want
+however
+light
+quite
+brought
+nor
+word
+whose
+given
+door
+best
+turned
+taken
+does
+use
+morning
+myself
+Gutenberg
+felt
+until
+since
+power
+themselves
+used
+rather
+began
+present
+voice
+others
+white
+works
+less
+money
+next
+poor
+death
+stood
+form
+within
+together
+till
+thy
+large
+matter
+kind
+often
+certain
+herself
+year
+friend
+half
+order
+round
+true
+anything
+keep
+sent
+wife
+means
+believe
+passed
+feet
+near
+public
+state
+son
+hundred
+children
+thus
+hope
+alone
+above
+case
+dear
+thee
+says
+person
+high
+read
+city
+already
+received
+fact
+gone
+girl
+known
+hear
+times
+least
+perhaps
+sure
+indeed
+english
+open
+body
+itself
+along
+land
+return
+leave
+air
+nature
+answered
+either
+law
+help
+lay
+point
+child
+letter
+four
+wish
+fire
+cried
+2
+women
+speak
+number
+therefore
+hour
+friends
+held
+free
+war
+during
+several
+business
+whether
+er
+manner
+second
+reason
+replied
+united
+call
+general
+why
+behind
+became
+john
+become
+dead
+earth
+boy
+lost
+forth
+thousand
+looking
+I'll
+family
+soul
+feel
+coming
+England
+spirit
+question
+care
+truth
+ground
+really
+rest
+mean
+different
+making
+possible
+fell
+towards
+human
+kept
+short
+town
+following
+need
+cause
+met
+evening
+returned
+five
+strong
+able
+french
+live
+lady
+subject
+sn
+answer
+sea
+fear
+understand
+hard
+terms
+doubt
+around
+ask
+arms
+turn
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+seems
+black
+bring
+followed
+beautiful
+close
+dark
+hold
+character
+sort
+sight
+ten
+show
+party
+fine
+ye
+ready
+story
+common
+book
+electronic
+talk
+account
+mark
+interest
+written
+can't
+bed
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+age
+else
+force
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+longer
+art
+spoke
+across
+brother
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+sometimes
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+saying
+table
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+river
+continued
+eye
+ety
+sun
+information
+later
+everything
+reached
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+strange
+deep
+change
+miles
+feeling
+act
+meet
+paid
+further
+purpose
+happy
+added
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+taking
+blood
+rose
+south
+beyond
+cold
+neither
+forward
+view
+I've
+position
+sound
+none
+entered
+clear
+road
+late
+stand
+suppose
+la
+daughter
+real
+nearly
+mine
+laws
+knowledge
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+toward
+bad
+cut
+copy
+husband
+six
+France
+living
+peace
+didn't
+low
+north
+remember
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+natural
+pretty
+fall
+fair
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+below
+except
+American
+hair
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+laid
+pass
+led
+copyright
+doing
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+run
+horse
+future
+opened
+pleasure
+history
+west
+pay
+red
+an'
+4
+hath
+note
+although
+wanted
+gold
+makes
+desire
+play
+master
+office
+tried
+front
+big
+Dr
+lived
+certainly
+wind
+receive
+attention
+government
+unto
+church
+strength
+length
+company
+placed
+paper
+letters
+probably
+glad
+important
+especially
+greater
+yourself
+fellow
+bear
+opinion
+window
+ran
+faith
+ago
+agreement
+charge
+beauty
+lips
+remained
+arm
+latter
+duty
+send
+distance
+silence
+foot
+wild
+object
+die
+save
+gentleman
+trees
+green
+trouble
+smile
+books
+wrong
+various
+sleep
+persons
+blockquote
+happened
+particular
+drew
+minutes
+hardly
+walked
+chief
+chance
+according
+beginning
+action
+deal
+loved
+visit
+thinking
+follow
+standing
+knows
+try
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+heavy
+sweet
+plain
+donations
+immediately
+wrote
+mouth
+rich
+thoughts
+months
+u
+won't
+afraid
+Paris
+single
+joy
+enemy
+broken
+unless
+states
+ship
+condition
+carry
+exclaimed
+including
+filled
+seeing
+influence
+write
+boys
+appear
+outside
+secret
+parts
+please
+appearance
+evil
+march
+george
+whatever
+slowly
+tears
+horses
+places
+caught
+stay
+instead
+struck
+blue
+York
+impossible
+period
+sister
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+school
+Mary
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+occasion
+married
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+former
+food
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+merely
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+born
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+covered
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+east
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+stone
+quickly
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+that's
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+speech
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+passage
+eight
+closed
+ourselves
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+medium
+efforts
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+plan
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+allow
+pale
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+running
+religious
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+names
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+father's
+threw
+worse
+built
+spoken
+glass
+board
+vain
+affairs
+instance
+safe
+loss
+doctor
+offer
+class
+complete
+access
+lower
+wouldn't
+repeated
+forms
+darkness
+military
+warm
+drink
+passion
+ones
+physical
+example
+ears
+questions
+start
+lying
+smiled
+keeping
+spite
+shown
+directly
+james
+hart
+serious
+hat
+dog
+silver
+sufficient
+main
+mentioned
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+train
+wonderful
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+associated
+path
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+enter
+rule
+sword
+attack
+seat
+game
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+paragraph
+statement
+social
+refund
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+provided
+special
+shook
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+mighty
+glance
+heads
+movement
+fee
+share
+expect
+couldn't
+dollars
+spread
+opposite
+glory
+twelve
+space
+engaged
+peter
+wine
+ordinary
+mountains
+taste
+iron
+isn't
+distribute
+trade
+consider
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+accepted
+forced
+advantage
+ideas
+decided
+using
+officer
+rate
+clothes
+sign
+feelings
+native
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+judge
+difference
+working
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+finished
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+foreign
+besides
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+jesus
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diff --git a/main/ui/src/test/java/org/cryptomator/ui/keyrecovery/WordEncoderTest.java b/main/ui/src/test/java/org/cryptomator/ui/keyrecovery/WordEncoderTest.java
new file mode 100644
index 000000000..784c638b6
--- /dev/null
+++ b/main/ui/src/test/java/org/cryptomator/ui/keyrecovery/WordEncoderTest.java
@@ -0,0 +1,42 @@
+package org.cryptomator.ui.keyrecovery;
+
+import org.junit.jupiter.api.Assertions;
+import org.junit.jupiter.api.BeforeAll;
+import org.junit.jupiter.api.DisplayName;
+import org.junit.jupiter.api.TestInstance;
+import org.junit.jupiter.params.ParameterizedTest;
+import org.junit.jupiter.params.provider.MethodSource;
+
+import java.util.Random;
+import java.util.stream.IntStream;
+import java.util.stream.Stream;
+
+@TestInstance(TestInstance.Lifecycle.PER_CLASS)
+class WordEncoderTest {
+
+	private static final Random PRNG = new Random(42l);
+	private WordEncoder encoder;
+
+	@BeforeAll
+	public void setup() {
+		encoder = new WordEncoder();
+	}
+
+	@DisplayName("decode(encode(input)) == input")
+	@ParameterizedTest(name = "test {index}")
+	@MethodSource("createRandomByteSequences")
+	void encodeAndDecode(byte[] input) {
+		String encoded = encoder.encodePadded(input);
+		byte[] decoded = encoder.decode(encoded);
+		Assertions.assertArrayEquals(input, decoded);
+	}
+
+	static Stream<byte[]> createRandomByteSequences() {
+		return IntStream.range(0, 30).mapToObj(i -> {
+			byte[] randomBytes = new byte[i * 3];
+			PRNG.nextBytes(randomBytes);
+			return randomBytes;
+		});
+	}
+
+}
\ No newline at end of file