diff --git a/package.json b/package.json
index 9434290..cfe6efe 100644
--- a/package.json
+++ b/package.json
@@ -7,6 +7,7 @@
     "bent": "^7.3.12",
     "browserify": "^17.0.0",
     "merge-options": "^3.0.3",
+    "openpgp": "^4.10.8",
     "prettier": "^2.1.2",
     "valid-url": "^1.0.9"
   },
diff --git a/yarn.lock b/yarn.lock
index bd8b9b0..178ce41 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -127,7 +127,7 @@ array-union@^2.1.0:
   resolved "https://registry.yarnpkg.com/array-union/-/array-union-2.1.0.tgz#b798420adbeb1de828d84acd8a2e23d3efe85e8d"
   integrity sha512-HGyxoOTYUyCM6stUe6EJgnd4EoewAI7zMdfqO+kGjnlZmBDz/cR5pf8r/cR4Wq60sL/p0IkcjUEEPwS3GFrIyw==
 
-asn1.js@^5.2.0:
+asn1.js@^5.0.0, asn1.js@^5.2.0:
   version "5.4.1"
   resolved "https://registry.yarnpkg.com/asn1.js/-/asn1.js-5.4.1.tgz#11a980b84ebb91781ce35b0fdc2ee294e3783f07"
   integrity sha512-+I//4cYPccV8LdmBLiX8CYvf9Sp3vQsrqu2QNXRcrbiWvcx/UdlFiqUJJzxRQxgsZmvhXhn4cSKeSmoFjVdupA==
@@ -968,7 +968,7 @@ globby@^10.0.1:
     merge2 "^1.2.3"
     slash "^3.0.0"
 
-graceful-fs@^4.1.6, graceful-fs@^4.2.0:
+graceful-fs@^4.1.11, graceful-fs@^4.1.6, graceful-fs@^4.2.0:
   version "4.2.4"
   resolved "https://registry.yarnpkg.com/graceful-fs/-/graceful-fs-4.2.4.tgz#2256bde14d3632958c465ebc96dc467ca07a29fb"
   integrity sha512-WjKPNJF79dtJAVniUlGGWHYGz2jWxT6VhN/4m1NdkbZ2nOsEF+cI1Edgql5zCRhs/VsQYRvrXctxktVXZUkixw==
@@ -1059,6 +1059,11 @@ ignore@^5.1.1, ignore@^5.1.2:
   resolved "https://registry.yarnpkg.com/ignore/-/ignore-5.1.8.tgz#f150a8b50a34289b33e22f5889abd4d8016f0e57"
   integrity sha512-BMpfD7PpiETpBl/A6S498BaIJ6Y/ABT93ETbby2fP00v4EbvPBXWEoaR1UBPKs3iR53pJY7EtZk5KACI57i1Uw==
 
+imurmurhash@^0.1.4:
+  version "0.1.4"
+  resolved "https://registry.yarnpkg.com/imurmurhash/-/imurmurhash-0.1.4.tgz#9218b9b2b928a238b13dc4fb6b6d576f231453ea"
+  integrity sha1-khi5srkoojixPcT7a21XbyMUU+o=
+
 inflight@^1.0.4:
   version "1.0.6"
   resolved "https://registry.yarnpkg.com/inflight/-/inflight-1.0.6.tgz#49bd6331d7d02d0c09bc910a1075ba8165b56df9"
@@ -1451,6 +1456,18 @@ no-case@^3.0.3:
     lower-case "^2.0.1"
     tslib "^1.10.0"
 
+node-fetch@^2.1.2:
+  version "2.6.1"
+  resolved "https://registry.yarnpkg.com/node-fetch/-/node-fetch-2.6.1.tgz#045bd323631f76ed2e2b55573394416b639a0052"
+  integrity sha512-V4aYg89jEoVRxRb2fJdAg8FHvI7cEyYdVAh94HH0UIK8oJxUfkjlDQN9RbMx+bEjP7+ggMiFRprSti032Oipxw==
+
+node-localstorage@~1.3.0:
+  version "1.3.1"
+  resolved "https://registry.yarnpkg.com/node-localstorage/-/node-localstorage-1.3.1.tgz#3177ef42837f398aee5dd75e319b281e40704243"
+  integrity sha512-NMWCSWWc6JbHT5PyWlNT2i8r7PgGYXVntmKawY83k/M0UJScZ5jirb61TLnqKwd815DfBQu+lR3sRw08SPzIaQ==
+  dependencies:
+    write-file-atomic "^1.1.4"
+
 normalize-path@^3.0.0, normalize-path@~3.0.0:
   version "3.0.0"
   resolved "https://registry.yarnpkg.com/normalize-path/-/normalize-path-3.0.0.tgz#0dcd69ff23a1c9b11fd0978316644a0388216a65"
@@ -1488,6 +1505,15 @@ once@^1.3.0:
   dependencies:
     wrappy "1"
 
+openpgp@^4.10.8:
+  version "4.10.8"
+  resolved "https://registry.yarnpkg.com/openpgp/-/openpgp-4.10.8.tgz#b08d9f52ced344128cf477dc060fc233792078aa"
+  integrity sha512-l+/u3TyR3+qS7mN0+HoNQRu/2BzHdLOMOOCDRLDE9gZGAqpKkD9ZD7hkpjan+GGY3f0nHaE7Qv7kI6qmQK+AkA==
+  dependencies:
+    asn1.js "^5.0.0"
+    node-fetch "^2.1.2"
+    node-localstorage "~1.3.0"
+
 os-browserify@~0.3.0:
   version "0.3.0"
   resolved "https://registry.yarnpkg.com/os-browserify/-/os-browserify-0.3.0.tgz#854373c7f5c2315914fc9bfc6bd8238fdda1ec27"
@@ -1817,6 +1843,11 @@ slash@^3.0.0:
   resolved "https://registry.yarnpkg.com/slash/-/slash-3.0.0.tgz#6539be870c165adbd5240220dbe361f1bc4d4634"
   integrity sha512-g9Q1haeby36OSStwb4ntCGGGaKsaVSjQ68fBxoQcutl5fS1vuY18H3wSt3jFyFtrkx+Kz0V1G85A4MyAdDMi2Q==
 
+slide@^1.1.5:
+  version "1.1.6"
+  resolved "https://registry.yarnpkg.com/slide/-/slide-1.1.6.tgz#56eb027d65b4d2dce6cb2e2d32c4d4afc9e1d707"
+  integrity sha1-VusCfWW00tzmyy4tMsTUr8nh1wc=
+
 source-map-support@~0.5.12, source-map-support@~0.5.19:
   version "0.5.19"
   resolved "https://registry.yarnpkg.com/source-map-support/-/source-map-support-0.5.19.tgz#a98b62f86dcaf4f67399648c085291ab9e8fed61"
@@ -2149,6 +2180,15 @@ wrappy@1:
   resolved "https://registry.yarnpkg.com/wrappy/-/wrappy-1.0.2.tgz#b5243d8f3ec1aa35f1364605bc0d1036e30ab69f"
   integrity sha1-tSQ9jz7BqjXxNkYFvA0QNuMKtp8=
 
+write-file-atomic@^1.1.4:
+  version "1.3.4"
+  resolved "https://registry.yarnpkg.com/write-file-atomic/-/write-file-atomic-1.3.4.tgz#f807a4f0b1d9e913ae7a48112e6cc3af1991b45f"
+  integrity sha1-+Aek8LHZ6ROuekgRLmzDrxmRtF8=
+  dependencies:
+    graceful-fs "^4.1.11"
+    imurmurhash "^0.1.4"
+    slide "^1.1.5"
+
 xtend@^4.0.0, xtend@^4.0.1, xtend@^4.0.2, xtend@~4.0.1:
   version "4.0.2"
   resolved "https://registry.yarnpkg.com/xtend/-/xtend-4.0.2.tgz#bb72779f5fa465186b1f438f674fa347fdb5db54"