diff --git a/types/triplesec/index.d.ts b/types/triplesec/index.d.ts
new file mode 100644
index 0000000000..00208a8d0a
--- /dev/null
+++ b/types/triplesec/index.d.ts
@@ -0,0 +1,31 @@
+// Type definitions for triplesec 3.0
+// Project: https://github.com/keybase/triplesec
+// Definitions by: Ben Speakman <https://github.com/threesquared>
+// Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+
+/// <reference types="node" />
+
+export interface WordArray {
+    sigBytes: number;
+    words: number[];
+    to_hex: () => string;
+}
+
+export interface Arguments {
+    data: Buffer;
+    key: Buffer;
+    progress_hook?: (progress: Progress) => void;
+}
+
+export interface Progress {
+    what: string;
+    i: number;
+    total: number;
+}
+
+export function encrypt(arg: Arguments, cb: (err: Error | null, buff: Buffer | null) => void): void;
+export function decrypt(arg: Arguments, cb: (err: Error | null, buff: Buffer | null) => void): void;
+
+export namespace prng {
+    function generate(n: number, cb: (words: WordArray) => void): void;
+}
diff --git a/types/triplesec/triplesec-tests.ts b/types/triplesec/triplesec-tests.ts
new file mode 100644
index 0000000000..adba7a131d
--- /dev/null
+++ b/types/triplesec/triplesec-tests.ts
@@ -0,0 +1,37 @@
+import * as triplesec from 'triplesec';
+
+const progressHook = (progress: triplesec.Progress) => {
+    progress.what; // $ExpectType string
+    progress.i; // $ExpectType number
+    progress.total; // $ExpectType number
+};
+
+triplesec.encrypt({
+    data: new Buffer('data'),
+    key: new Buffer('key'),
+    progress_hook: progressHook,
+}, (err, buff) => {
+    if (err === null) {
+        buff; // $ExpectType Buffer | null
+    } else {
+        err; // $ExpectType Error
+    }
+});
+
+triplesec.decrypt({
+    data: new Buffer('data'),
+    key: new Buffer('key'),
+    progress_hook: progressHook,
+}, (err, buff) => {
+    if (err === null) {
+        buff; // $ExpectType Buffer | null
+    } else {
+        err; // $ExpectType Error
+    }
+});
+
+triplesec.prng.generate(24, words => {
+    words.sigBytes; // $ExpectType number
+    words.words; // $ExpectType number[]
+    words.to_hex(); // $ExpectType string
+});
diff --git a/types/triplesec/tsconfig.json b/types/triplesec/tsconfig.json
new file mode 100644
index 0000000000..cf233cc7e0
--- /dev/null
+++ b/types/triplesec/tsconfig.json
@@ -0,0 +1,23 @@
+{
+    "compilerOptions": {
+        "module": "commonjs",
+        "lib": [
+            "es6"
+        ],
+        "noImplicitAny": true,
+        "noImplicitThis": true,
+        "strictFunctionTypes": true,
+        "strictNullChecks": true,
+        "baseUrl": "../",
+        "typeRoots": [
+            "../"
+        ],
+        "types": [],
+        "noEmit": true,
+        "forceConsistentCasingInFileNames": true
+    },
+    "files": [
+        "index.d.ts",
+        "triplesec-tests.ts"
+    ]
+}
diff --git a/types/triplesec/tslint.json b/types/triplesec/tslint.json
new file mode 100644
index 0000000000..3db14f85ea
--- /dev/null
+++ b/types/triplesec/tslint.json
@@ -0,0 +1 @@
+{ "extends": "dtslint/dt.json" }