diff --git a/iiif-server/README.md b/iiif-server/README.md
index 3cdc58c..fd8c291 100644
--- a/iiif-server/README.md
+++ b/iiif-server/README.md
@@ -34,3 +34,29 @@ This will use the previously saved config file
   - `Namespace`: The infrastructure namespace prefix to use for secrets management
   - `ServerlessIiifVersion`: The version of Serverless IIIF to deploy (Default: `5.0.0`)
   - `SourceBucket`: The bucket where the pyramid TIFF images are stored
+
+## IIIF requests with signed urls
+
+Optionally, the viewer function supports HMAC-signed URLs with an expires parameter.
+
+- URL will take the form `https://iiif-server.domain/iiif/:version/:id/:region/:size/:rotation/:quality.:format?Auth-Signature=:jwt`
+- JWT will be signed using symmetric HMAC encryption and the same key we currently use for the cookie auth JWTs
+- JWT will have the following structure:
+    ```javascript
+    {
+      "sub": "my-image-id",           // image ID, required
+      "region": ["0,0,256,256"],      // list of valid IIIF region values, optional
+      "size": ["pct:50"],             // list of valid IIIF size values, optional
+      "rotation": ["0", "180", "!0"], // list of valid IIIF rotation values, optional
+      "quality": ["bitonal", "gray"], // list of valid IIIF quality values, optional
+      "format": ["jpg", "png"],       // list of valid IIIF format values, optional
+      "max-width": 1024,              // maximum width in pixels, optional
+      "max-height": 768               // maximum height in pixels, optional
+      "exp": 1687550764               // expiration timestamp, required
+    }
+    ```
+The request will be validated based on the fields present in the JWT.
+- The `sub` field _must_ match the `:id` of the request.
+- Any other IIIF spec field (`region`, `size`, `rotation`, `quality`, `format`), if present, will limit the valid values in the request. If the requested value does not appear in the list, the request will be denied. If a field is not present, any valid value is acceptable.
+- If `max-width` and/or `max-height` is present, it will limit the size of the *full-frame image* that can be retrieved. That is, the authorizer will determine what the size of the whole image would be _after_ the region and size parameters are taken into account, and only authorize the request if both dimensions are less than or equal to `max-width` and `max-height`.
+- The `exp` field indicates the time (expressed as seconds since the UNIX epoch) beyond which the signature is no longer valid.
diff --git a/iiif-server/src/index.js b/iiif-server/src/index.js
index a9dadc5..1801beb 100644
--- a/iiif-server/src/index.js
+++ b/iiif-server/src/index.js
@@ -1,7 +1,10 @@
 const authorize = require("./authorize");
+const validateJwtClaims = require("./validate-jwt");
+const jwt = require("jsonwebtoken");
 const middy = require("@middy/core");
 const secretsManager = require("@middy/secrets-manager");
 
+
 function getEventHeader(request, name) {
   if (
     request.headers &&
@@ -14,6 +17,14 @@ function getEventHeader(request, name) {
   }
 }
 
+function s3Location(params, bucket) {
+  const pairtree = params.id.match(/.{1,2}/g).join("/");
+
+  return params.poster
+    ? `s3://${bucket}/posters/${pairtree}-poster.tif`
+    : `s3://${bucket}/${pairtree}-pyramid.tif`;
+}
+
 function viewerRequestOptions(request) {
   const origin = getEventHeader(request, "origin") || "*";
   return {
@@ -44,25 +55,66 @@ function parsePath(path) {
     return {
       poster: segments[2] == "posters",
       id: segments[1],
-      filename: segments[0]
+      filename: segments[0],
+      version: segments[6]
     };
   } else {
+    const filename = segments[0].split(".");
     return {
       poster: segments[5] == "posters",
       id: segments[4],
       region: segments[3],
       size: segments[2],
       rotation: segments[1],
-      filename: segments[0]
+      filename: segments[0],
+      quality: filename[0],
+      format: filename[1],
+      version: segments[5]
     };
   }
 }
 
+function getAuthSignature(request) {
+  if (!request.querystring) {
+    return null;
+  }
+
+  const parsedQuery = new URLSearchParams(request.querystring);
+  return parsedQuery.get('Auth-Signature', null)
+}
+
 async function viewerRequestIiif(request, { config }) {
   const path = decodeURI(request.uri.replace(/%2f/gi, ""));
   const params = parsePath(path);
   const referer = getEventHeader(request, "referer");
   const cookie = getEventHeader(request, "cookie");
+  const authSignature = getAuthSignature(request);
+
+  if (authSignature) {
+    let jwtClaims;
+    try {
+      jwtClaims = jwt.verify(authSignature, config.apiTokenKey);
+    } catch (err) {
+      console.error(err)
+      return {
+        status: "403",
+        statusDescription: "Forbidden",
+        body: "Invalid JWT"
+      };
+    }
+
+    const jwtResult = await validateJwtClaims(jwtClaims, params, config);
+
+    if (!jwtResult.valid) {
+      console.log(`Could not verify JWT claims: ${jwtResult.reason}`);
+      return {
+        status: "403",
+        statusDescription: "Forbidden",
+        body: "Forbidden"
+      };
+    }
+  }
+
   const authed = await authorize(
     params,
     referer,
@@ -82,12 +134,9 @@ async function viewerRequestIiif(request, { config }) {
   }
 
   // Set the x-preflight-location request header to the location of the requested item
-  const pairtree = params.id.match(/.{1,2}/g).join("/");
-  const s3Location = params.poster
-    ? `s3://${config.tiffBucket}/posters/${pairtree}-poster.tif`
-    : `s3://${config.tiffBucket}/${pairtree}-pyramid.tif`;
+  const location = s3Location(params, config.tiffBucket);
   request.headers["x-preflight-location"] = [
-    { key: "X-Preflight-Location", value: s3Location }
+    { key: "X-Preflight-Location", value: location }
   ];
   return request;
 }
@@ -152,14 +201,14 @@ function functionNameAndRegion() {
 const { functionName, functionRegion } = functionNameAndRegion();
 console.log("Initializing", functionName, 'in', functionRegion);
 
-module.exports = { 
+module.exports = {
   handler:
     middy(processRequest)
-    .use(
-      secretsManager({
-        fetchData: { config: functionName },
-        awsClientOptions: { region: functionRegion },
-        setToContext: true
-      })
-    )
+      .use(
+        secretsManager({
+          fetchData: { config: functionName },
+          awsClientOptions: { region: functionRegion },
+          setToContext: true
+        })
+      )
 };
diff --git a/iiif-server/src/package-lock.json b/iiif-server/src/package-lock.json
index 71c5b78..336be7e 100644
--- a/iiif-server/src/package-lock.json
+++ b/iiif-server/src/package-lock.json
@@ -11,6 +11,8 @@
       "dependencies": {
         "@middy/core": "4.6.4",
         "@middy/secrets-manager": "4.6.4",
+        "iiif-processor": "^4.0.7",
+        "jsonwebtoken": "^9.0.2",
         "lodash.isstring": "^4.0.1",
         "node-fetch": "^2.3.0"
       }
@@ -54,11 +56,424 @@
         "url": "https://github.com/sponsors/willfarrell"
       }
     },
+    "node_modules/b4a": {
+      "version": "1.6.7",
+      "resolved": "https://registry.npmjs.org/b4a/-/b4a-1.6.7.tgz",
+      "integrity": "sha512-OnAYlL5b7LEkALw87fUVafQw5rVR9RjwGd4KUwNQ6DrrNmaVaUCgLipfVlzrPQ4tWOR9P0IXGNOx50jYCCdSJg=="
+    },
+    "node_modules/bare-events": {
+      "version": "2.5.0",
+      "resolved": "https://registry.npmjs.org/bare-events/-/bare-events-2.5.0.tgz",
+      "integrity": "sha512-/E8dDe9dsbLyh2qrZ64PEPadOQ0F4gbl1sUJOrmph7xOiIxfY8vwab/4bFLh4Y88/Hk/ujKcrQKc+ps0mv873A==",
+      "optional": true
+    },
+    "node_modules/bare-fs": {
+      "version": "2.3.5",
+      "resolved": "https://registry.npmjs.org/bare-fs/-/bare-fs-2.3.5.tgz",
+      "integrity": "sha512-SlE9eTxifPDJrT6YgemQ1WGFleevzwY+XAP1Xqgl56HtcrisC2CHCZ2tq6dBpcH2TnNxwUEUGhweo+lrQtYuiw==",
+      "optional": true,
+      "dependencies": {
+        "bare-events": "^2.0.0",
+        "bare-path": "^2.0.0",
+        "bare-stream": "^2.0.0"
+      }
+    },
+    "node_modules/bare-os": {
+      "version": "2.4.4",
+      "resolved": "https://registry.npmjs.org/bare-os/-/bare-os-2.4.4.tgz",
+      "integrity": "sha512-z3UiI2yi1mK0sXeRdc4O1Kk8aOa/e+FNWZcTiPB/dfTWyLypuE99LibgRaQki914Jq//yAWylcAt+mknKdixRQ==",
+      "optional": true
+    },
+    "node_modules/bare-path": {
+      "version": "2.1.3",
+      "resolved": "https://registry.npmjs.org/bare-path/-/bare-path-2.1.3.tgz",
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+      "optional": true,
+      "dependencies": {
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+      }
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+      "optional": true,
+      "dependencies": {
+        "streamx": "^2.20.0"
+      }
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+      "funding": [
+        {
+          "type": "github",
+          "url": "https://github.com/sponsors/feross"
+        },
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+          "url": "https://www.patreon.com/feross"
+        },
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+          "type": "consulting",
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+    },
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diff --git a/iiif-server/src/package.json b/iiif-server/src/package.json
index 1d09714..8501bd6 100644
--- a/iiif-server/src/package.json
+++ b/iiif-server/src/package.json
@@ -8,6 +8,8 @@
   "dependencies": {
     "@middy/core": "4.6.4",
     "@middy/secrets-manager": "4.6.4",
+    "iiif-processor": "^4.0.7",
+    "jsonwebtoken": "^9.0.2",
     "lodash.isstring": "^4.0.1",
     "node-fetch": "^2.3.0"
   }
diff --git a/iiif-server/src/validate-jwt.js b/iiif-server/src/validate-jwt.js
new file mode 100644
index 0000000..1f0b312
--- /dev/null
+++ b/iiif-server/src/validate-jwt.js
@@ -0,0 +1,86 @@
+const { S3Client, HeadObjectCommand } = require("@aws-sdk/client-s3");
+const IIIF = require('iiif-processor');
+
+async function validateJwtClaims(jwtClaims, params, config) {
+  console.log("Validating JWT claims");
+  const currentTime = Math.floor(Date.now() / 1000);
+
+  if (jwtClaims.exp <= currentTime) {
+    return { valid: false, reason: "Token expired" }
+  }
+
+  if (jwtClaims.sub !== params.id) {
+    return { valid: false, reason: "ID mismatch" }
+  }
+
+  const fields = ['region', 'size', 'rotation', 'quality', 'format'];
+  for (const field of fields) {
+    if (jwtClaims[field] && !jwtClaims[field].includes(params[field])) {
+      return { valid: false, reason: `${field} mismatch` }
+    }
+  }
+
+  if (jwtClaims['max-width'] || jwtClaims['max-height']) {
+    const dimensions = await s3Dimensions(config.tiffBucket, s3Key(params));
+
+    if (dimensions) {
+      const Calculator = IIIF.Versions[params.version].Calculator;
+      const calculator = new Calculator(dimensions);
+
+      calculator
+        .region(params.region)
+        .size(params.size)
+        .rotation(params.rotation)
+        .quality(params.quality)
+        .format(params.format);
+
+      const requestedDimensions = calculator.info().fullSize;
+
+      if (requestedDimensions.width > jwtClaims['max-width']) {
+        return { valid: false, reason: "Exceeds max-width" }
+      }
+
+      if (requestedDimensions.height > jwtClaims['max-height']) {
+        return { valid: false, reason: "Exceeds max-height" }
+      }
+    }
+  }
+
+  return { valid: true };
+}
+
+async function s3Dimensions(bucket, key) {
+  const input = {
+    "Bucket": bucket,
+    "Key": key
+  }
+  try {
+    const s3 = new S3Client();
+    const cmd = new HeadObjectCommand(input);
+    const response = await s3.send(cmd);
+    const { Metadata } = response;
+    if (Metadata.width && Metadata.height) {
+      return {
+        width: parseInt(Metadata.width, 10),
+        height: parseInt(Metadata.height, 10)
+      };
+    } else {
+      console.log("Missing width and height metadata in S3 object");
+      return null;
+    }
+  } catch (err) {
+    console.log("Error fetching S3 object metadata");
+    console.log(err);
+    return null;
+  }
+}
+
+function s3Key(params) {
+  const pairtree = params.id.match(/.{1,2}/g).join("/");
+
+  return params.poster
+    ? `posters/${pairtree}-poster.tif`
+    : `${pairtree}-pyramid.tif`;
+}
+
+module.exports = validateJwtClaims
\ No newline at end of file
diff --git a/iiif-server/template.yaml b/iiif-server/template.yaml
index 62c9ca8..77629f2 100644
--- a/iiif-server/template.yaml
+++ b/iiif-server/template.yaml
@@ -14,6 +14,8 @@ Parameters:
   AllowFromReferers:
     Type: String
     Default: ""
+  ApiTokenKey:
+    Type: String
   CertificateArn:
     Type: String
   DcApiEndpoint:
@@ -70,6 +72,17 @@ Resources:
                 - lambda.amazonaws.com
             Action:
               - 'sts:AssumeRole'
+      Policies:
+        Version: 2012-10-17
+        Statement:
+          - Sid: PyramidBucketAccess
+            Effect: Allow
+            Action:
+              - s3:ListBucket
+              - s3:GetObject
+            Resource: 
+              - !Sub "arn:aws:s3:::${SourceBucket}"
+              - !Sub "arn:aws:s3:::${SourceBucket}/*"
   ViewerRequestSecret:
     Type: AWS::SecretsManager::Secret
     Properties:
@@ -79,6 +92,7 @@ Resources:
           allowFrom: !Ref AllowFromReferers
           dcApiEndpoint: !Ref DcApiEndpoint
           tiffBucket: !Ref SourceBucket
+          apiTokenKey: !Ref ApiTokenKey
   ViewerRequestSecretAccess:
     Type: AWS::SecretsManager::ResourcePolicy
     Properties: 
@@ -97,7 +111,7 @@ Resources:
   ConfigurationSecret:
     Type: AWS::SecretsManager::Secret
     Properties:
-      Name: !Sub "${Namespace}/iiif-url"
+      Name: !Sub "${Namespace}/infrastructure/iiif"
       SecretString:
         Fn::ToJsonString:
           base: !Sub "https://${Hostname}.${DomainName}/"