diff --git a/astool/security-v1.jsonld b/astool/security-v1.jsonld
new file mode 100644
index 0000000..0180cdf
--- /dev/null
+++ b/astool/security-v1.jsonld
@@ -0,0 +1,149 @@
+{
+  "@context": [
+    {
+      "as": "https://www.w3.org/ns/activitystreams",
+      "owl": "http://www.w3.org/2002/07/owl#",
+      "rdf": "http://www.w3.org/1999/02/22-rdf-syntax-ns#",
+      "rdfs": "http://www.w3.org/2000/01/rdf-schema#",
+      "rfc": "https://tools.ietf.org/html/",
+      "schema": "http://schema.org/",
+      "xsd": "http://www.w3.org/2001/XMLSchema#"
+    },
+    {
+      "domain": "rdfs:domain",
+      "example": "schema:workExample",
+      "isDefinedBy": "rdfs:isDefinedBy",
+      "mainEntity": "schema:mainEntity",
+      "members": "owl:members",
+      "name": "schema:name",
+      "notes": "rdfs:comment",
+      "range": "rdfs:range",
+      "subClassOf": "rdfs:subClassOf",
+      "disjointWith": "owl:disjointWith",
+      "subPropertyOf": "rdfs:subPropertyOf",
+      "unionOf": "owl:unionOf",
+      "url": "schema:URL"
+    }
+  ],
+  "id": "https://w3id.org/security/v1",
+  "type": "owl:Ontology",
+  "name": "W3IDSecurityV1",
+  "members": [
+    {
+      "id": "https://w3id.org/security/v1#PublicKey",
+      "type": "owl:Class",
+      "notes": "A public key represents a public cryptographical key for a user",
+      "subClassOf": [
+        {
+          "type": "owl:Class",
+          "url": "https://www.w3.org/ns/activitystreams#Object",
+          "name": "as:Object"
+        }
+      ],
+      "name": "PublicKey",
+      "url": "https://w3id.org/security/v1#PublicKey"
+    },
+    {
+      "id": "https://w3id.org/security/v1#dfn-publickey",
+      "type": [
+        "rdf:Property",
+        "owl:ObjectProperty"
+      ],
+      "example": {},
+      "notes": "The public key for an ActivityStreams actor",
+      "domain": {
+        "type": "owl:Class",
+        "unionOf": [
+          {
+            "type": "owl:Class",
+            "url": "https://www.w3.org/ns/activitystreams#Application",
+            "name": "as:Application"
+          },
+          {
+            "type": "owl:Class",
+            "url": "https://www.w3.org/ns/activitystreams#Group",
+            "name": "as:Group"
+          },
+          {
+            "type": "owl:Class",
+            "url": "https://www.w3.org/ns/activitystreams#Organization",
+            "name": "as:Organization"
+          },
+          {
+            "type": "owl:Class",
+            "url": "https://www.w3.org/ns/activitystreams#Person",
+            "name": "as:Person"
+          },
+          {
+            "type": "owl:Class",
+            "url": "https://www.w3.org/ns/activitystreams#Service",
+            "name": "as:Service"
+          }
+        ]
+      },
+      "isDefinedBy": "https://w3id.org/security/v1#dfn-publickey",
+      "range": {
+        "type": "owl:Class",
+        "unionOf": [
+          {
+            "type": "owl:Class",
+            "url": "https://w3id.org/security/v1#PublicKey",
+            "name": "PublicKey"
+          }
+        ]
+      },
+      "name": "publicKey",
+      "url": "https://w3id.org/security/v1#dfn-publickey"
+    },
+    {
+      "id": "https://w3id.org/security/v1#dfn-publickeypem",
+      "type": [
+        "rdf:Property",
+        "owl:FunctionalProperty"
+      ],
+      "notes": "The public key PEM encoded data for an ActivityStreams actor",
+      "domain": {
+        "type": "owl:Class",
+        "unionOf": [
+          {
+            "type": "owl:Class",
+            "url": "https://w3id.org/security/v1#PublicKey",
+            "name": "PublicKey"
+          }
+        ]
+      },
+      "isDefinedBy": "https://w3id.org/security/v1#dfn-publickeypem",
+      "range": {
+        "type": "owl:Class",
+        "unionOf": "xsd:string"
+      },
+      "name": "publicKeyPem",
+      "url": "https://w3id.org/security/v1#dfn-publickeypem"
+    },
+    {
+      "id": "https://w3id.org/security/v1#dfn-owner",
+      "type": [
+        "rdf:Property",
+        "owl:FunctionalProperty"
+      ],
+      "notes": "The owner of the public key for an ActivityStreams actor",
+      "domain": {
+        "type": "owl:Class",
+        "unionOf": [
+          {
+            "type": "owl:Class",
+            "url": "https://w3id.org/security/v1#PublicKey",
+            "name": "PublicKey"
+          }
+        ]
+      },
+      "isDefinedBy": "https://w3id.org/security/v1#dfn-owner",
+      "range": {
+        "type": "owl:Class",
+        "unionOf": "xsd:anyURI"
+      },
+      "name": "owner",
+      "url": "https://w3id.org/security/v1#dfn-owner"
+    }
+  ]
+}
diff --git a/go.mod b/go.mod
index 9acc6e1..bc2a753 100644
--- a/go.mod
+++ b/go.mod
@@ -4,8 +4,7 @@ go 1.12
 
 require (
 	github.com/dave/jennifer v1.3.0
-	github.com/go-fed/activity v0.4.0
-	github.com/go-fed/httpsig v0.1.0
+	github.com/go-fed/httpsig v0.1.1-0.20190914113940-c2de3672e5b5
 	github.com/go-test/deep v1.0.1
 	github.com/golang/mock v1.2.0
 )
diff --git a/go.sum b/go.sum
index e7f3ae4..9a2b509 100644
--- a/go.sum
+++ b/go.sum
@@ -4,6 +4,8 @@ github.com/go-fed/activity v0.4.0 h1:1YOYLMT+x2hx+AtQZNQHOGBXWnn2CF/10jGxTjaOEsw
 github.com/go-fed/activity v0.4.0/go.mod h1:QeFu271luhA2o47U3/DR6iWtxiB9Fw2dKGbvL8edM9E=
 github.com/go-fed/httpsig v0.1.0 h1:6F2OxRVnNTN4OPN+Mc2jxs2WEay9/qiHT/jphlvAwIY=
 github.com/go-fed/httpsig v0.1.0/go.mod h1:T56HUNYZUQ1AGUzhAYPugZfp36sKApVnGBgKlIY+aIE=
+github.com/go-fed/httpsig v0.1.1-0.20190914113940-c2de3672e5b5 h1:WLvFZqoXnuVTBKA6U/1FnEHNQ0Rq0QM0rGhY8Tx6R1g=
+github.com/go-fed/httpsig v0.1.1-0.20190914113940-c2de3672e5b5/go.mod h1:T56HUNYZUQ1AGUzhAYPugZfp36sKApVnGBgKlIY+aIE=
 github.com/go-test/deep v1.0.1 h1:UQhStjbkDClarlmv0am7OXXO4/GaPdCGiUiMTvi28sg=
 github.com/go-test/deep v1.0.1/go.mod h1:wGDj63lr65AM2AQyKZd/NYHGb0R+1RLqB8NKt3aSFNA=
 github.com/golang/mock v1.2.0 h1:28o5sBqPkBsMGnC6b4MvE2TzSr5/AT4c/1fLqVGIwlk=