diff --git a/README.md b/README.md
index e38af1f..2fd7c51 100644
--- a/README.md
+++ b/README.md
@@ -216,6 +216,15 @@ Example input JSON format:
            -d '{"Name":"Alice","Password":"Lewis","ToModify":"Bill","Command":"admin"}'
     {"Status":"ok"}
 
+### Purge
+
+Purge deletes all delegates for an encryption key.
+
+Example input JSON format:
+
+    $ curl --cacert cert/server.crt https://localhost:8080/purge \
+           -d '{"Name":"Alice","Password":"Lewis"}'
+    {"Status":"ok"}
 
 ### Web interface
 
diff --git a/client/client.go b/client/client.go
index 22609ae..2b843bc 100644
--- a/client/client.go
+++ b/client/client.go
@@ -144,6 +144,21 @@ func (c *RemoteServer) Delegate(req core.DelegateRequest) (*core.ResponseData, e
 	return unmarshalResponseData(respBytes)
 }
 
+// Purge issues a purge request to the remote server
+func (c *RemoteServer) Purge(req core.DelegateRequest) (*core.ResponseData, error) {
+	reqBytes, err := json.Marshal(req)
+	if err != nil {
+		return nil, err
+	}
+
+	respBytes, err := c.doAction("purge", reqBytes)
+	if err != nil {
+		return nil, err
+	}
+
+	return unmarshalResponseData(respBytes)
+}
+
 // Modify issues a modify request to the remote server
 func (c *RemoteServer) Modify(req core.ModifyRequest) (*core.ResponseData, error) {
 	reqBytes, err := json.Marshal(req)
diff --git a/core/core.go b/core/core.go
index 4d91719..2a5ab3c 100644
--- a/core/core.go
+++ b/core/core.go
@@ -36,6 +36,11 @@ type SummaryRequest struct {
 	Password string
 }
 
+type PurgeRequest struct {
+	Name     string
+	Password string
+}
+
 type DelegateRequest struct {
 	Name     string
 	Password string
@@ -251,6 +256,37 @@ func Summary(jsonIn []byte) ([]byte, error) {
 	return jsonSummary()
 }
 
+// Purge processes a delegation purge request.
+func Purge(jsonIn []byte) ([]byte, error) {
+	var s PurgeRequest
+	var err error
+
+	defer func() {
+		if err != nil {
+			log.Printf("core.purge failed: user=%s %v", s.Name, err)
+		} else {
+			log.Printf("core.purge success: user=%s", s.Name)
+		}
+	}()
+
+	if err = json.Unmarshal(jsonIn, &s); err != nil {
+		return jsonStatusError(err)
+	}
+
+	if records.NumRecords() == 0 {
+		err = errors.New("vault has not been created")
+		return jsonStatusError(err)
+	}
+
+	// Validate the Name and Password as valid and admin
+	if err = validateUser(s.Name, s.Password, true); err != nil {
+		return jsonStatusError(err)
+	}
+
+	cache.FlushCache()
+	return jsonStatusOk()
+}
+
 // Delegate processes a delegation request.
 func Delegate(jsonIn []byte) ([]byte, error) {
 	var s DelegateRequest
diff --git a/core/core_test.go b/core/core_test.go
index fb5f7ec..e665d18 100644
--- a/core/core_test.go
+++ b/core/core_test.go
@@ -7,8 +7,8 @@ package core
 import (
 	"bytes"
 	"encoding/json"
-	"reflect"
 	"os"
+	"reflect"
 	"sort"
 	"testing"
 
@@ -161,6 +161,58 @@ func TestSummary(t *testing.T) {
 	if dataLive.Type != passvault.DefaultRecordType {
 		t.Fatalf("Error in summary of account, record missing")
 	}
+
+	var s1 SummaryData
+	delegations := cache.GetSummary()
+	if len(delegations) == 0 {
+		t.Fatal("no delegations active")
+	}
+
+	// check for summary of initialized vault without non-admin members after purge
+	respJson, err = Purge(createJson)
+	if err != nil {
+		t.Fatalf("Error in purging, %v", err)
+	}
+	err = json.Unmarshal(respJson, &s1)
+	if err != nil {
+		t.Fatalf("Error in purging, %v", err)
+	}
+	if s.Status != "ok" {
+		t.Fatalf("Error in purging, %v", s.Status)
+	}
+
+	respJson, err = Summary(createJson)
+	if err != nil {
+		t.Fatalf("Error in summary of account with no vault, %v", err)
+	}
+	err = json.Unmarshal(respJson, &s1)
+	if err != nil {
+		t.Fatalf("Error in summary of account with no vault, %v", err)
+	}
+	if s.Status != "ok" {
+		t.Fatalf("Error in summary of account with no vault, %v", s.Status)
+	}
+
+	data, ok = s1.All["Alice"]
+	if !ok {
+		t.Fatalf("Error in summary of account, record missing")
+	}
+	if data.Admin != true {
+		t.Fatalf("Error in summary of account, record missing")
+	}
+	if data.Type != passvault.DefaultRecordType {
+		t.Fatalf("Error in summary of account, record missing")
+	}
+
+	_, ok = s1.All["Bob"]
+	if !ok {
+		t.Fatal("Bob was removed from the list of users")
+	}
+
+	delegations = cache.GetSummary()
+	if len(delegations) != 0 {
+		t.Fatalf("purge failed to clear delegations (%d delegations remain)", len(delegations))
+	}
 }
 
 func TestPassword(t *testing.T) {
diff --git a/redoctober.go b/redoctober.go
index defb717..d2b9d3a 100644
--- a/redoctober.go
+++ b/redoctober.go
@@ -29,6 +29,7 @@ import (
 var functions = map[string]func([]byte) ([]byte, error){
 	"/create":   core.Create,
 	"/summary":  core.Summary,
+	"/purge":    core.Purge,
 	"/delegate": core.Delegate,
 	"/password": core.Password,
 	"/encrypt":  core.Encrypt,