diff --git a/2017/day04/day04.go b/2017/day04/day04.go
new file mode 100644
index 0000000..aa56df4
--- /dev/null
+++ b/2017/day04/day04.go
@@ -0,0 +1,91 @@
+package main
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"strings"
+)
+
+func main() {
+	inp := StdinToStrings()
+	part1(inp)
+	part2(inp)
+}
+
+func part1(inp []string) {
+	fmt.Println("== Part 1 ==")
+	cnt := 0
+	for _, v := range inp {
+		wrds := strings.Split(v, " ")
+		isGood := true
+		for i := range wrds {
+			for j := i + 1; j < len(wrds); j++ {
+				if wrds[i] == wrds[j] {
+					isGood = false
+				}
+				if !isGood {
+					break
+				}
+			}
+			if !isGood {
+				break
+			}
+		}
+		if isGood {
+			cnt++
+		}
+	}
+	fmt.Println("Valid Passphrases:", cnt)
+}
+
+func part2(inp []string) {
+	fmt.Println("== Part 2 ==")
+	cnt := 0
+	for _, v := range inp {
+		wrds := strings.Split(v, " ")
+		isGood := true
+		for i := range wrds {
+			for j := i + 1; j < len(wrds); j++ {
+				if isAnagram(wrds[i], wrds[j]) {
+					isGood = false
+				}
+				if !isGood {
+					break
+				}
+			}
+			if !isGood {
+				break
+			}
+		}
+		if isGood {
+			cnt++
+		}
+	}
+	fmt.Println("Valid Passphrases:", cnt)
+}
+
+func isAnagram(wrd1, wrd2 string) bool {
+	charMap := make(map[byte]int)
+	for i := range wrd1 {
+		charMap[wrd1[i]]++
+	}
+	for i := range wrd2 {
+		charMap[wrd2[i]]--
+	}
+	for _, v := range charMap {
+		if v != 0 {
+			return false
+		}
+	}
+	return true
+}
+
+func StdinToStrings() []string {
+	var input []string
+	scanner := bufio.NewScanner(os.Stdin)
+	for scanner.Scan() {
+		input = append(input, scanner.Text())
+	}
+	return input
+}
diff --git a/2017/day04/input b/2017/day04/input
new file mode 100644
index 0000000..bf3fffb
--- /dev/null
+++ b/2017/day04/input
@@ -0,0 +1,512 @@
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diff --git a/2017/day04/problem b/2017/day04/problem
new file mode 100644
index 0000000..10bef00
--- /dev/null
+++ b/2017/day04/problem
@@ -0,0 +1,74 @@
+Advent of Code
+
+--- Day 4: High-Entropy Passphrases ---
+
+   A new system policy has been put in place that requires all
+   accounts to use a passphrase instead of simply a password. A
+   passphrase consists of a series of words (lowercase letters)
+   separated by spaces.
+
+   To ensure security, a valid passphrase must contain no
+   duplicate words.
+
+   For example:
+
+     * aa bb cc dd ee is valid.
+     * aa bb cc dd aa is not valid - the word aa appears more
+       than once.
+     * aa bb cc dd aaa is valid - aa and aaa count as different
+       words.
+
+   The system's full passphrase list is available as your
+   puzzle input. How many passphrases are valid?
+
+   Your puzzle answer was ____.
+
+--- Part Two ---
+
+   For added security, yet another system policy has been put
+   in place. Now, a valid passphrase must contain no two words
+   that are anagrams of each other - that is, a passphrase is
+   invalid if any word's letters can be rearranged to form any
+   other word in the passphrase.
+
+   For example:
+
+     * abcde fghij is a valid passphrase.
+     * abcde xyz ecdab is not valid - the letters from the
+       third word can be rearranged to form the first word.
+     * a ab abc abd abf abj is a valid passphrase, because all
+       letters need to be used when forming another word.
+     * iiii oiii ooii oooi oooo is valid.
+     * oiii ioii iioi iiio is not valid - any of these words
+       can be rearranged to form any other word.
+
+   Under this new system policy, how many passphrases are
+   valid?
+
+   Your puzzle answer was ____.
+
+   Both parts of this puzzle are complete! They provide two
+   gold stars: **
+
+   At this point, you should return to your advent calendar and
+   try another puzzle.
+
+   If you still want to see it, you can get your puzzle input.
+
+References
+
+   Visible links
+   . http://adventofcode.com/
+   . http://adventofcode.com/2017/about
+   . http://adventofcode.com/2017/support
+   . http://adventofcode.com/2017/events
+   . http://adventofcode.com/2017/settings
+   . http://adventofcode.com/2017/auth/logout
+   . http://adventofcode.com/2017
+   . http://adventofcode.com/2017
+   . http://adventofcode.com/2017/leaderboard
+   . http://adventofcode.com/2017/stats
+   . http://adventofcode.com/2017/sponsors
+   . http://adventofcode.com/2017/sponsors
+   . http://adventofcode.com/2017
+   . http://adventofcode.com/2017/day/4/input