diff --git a/src/utils/validation-helpers.ts b/src/utils/validation-helpers.ts
index 5cf715b..f555a8d 100644
--- a/src/utils/validation-helpers.ts
+++ b/src/utils/validation-helpers.ts
@@ -499,14 +499,41 @@ export const NetworkConfigSchema = {
 /**
  * SecurityConfigSchema - Public validation helper for security configuration.
  */
-export const SecurityConfigSchema = {
+type RequiredSecuritySecret =
+  | 'sep10SigningKey'
+  | 'interactiveJwtSecret'
+  | 'distributionAccountSecret';
+
+type SecurityConfigSchemaDefinition = Record<RequiredSecuritySecret, SchemaField> & {
+  validate(config: SecurityConfig): void;
+};
+
+export const SecurityConfigSchema: SecurityConfigSchemaDefinition = {
+  sep10SigningKey: {
+    type: 'string',
+    required: true,
+    description: 'SEP-10 server signing secret.',
+    validate: (value) => typeof value === 'string' && value.trim().length > 0,
+  },
+  interactiveJwtSecret: {
+    type: 'string',
+    required: true,
+    description: 'Secret used to sign interactive JWTs.',
+    validate: (value) => typeof value === 'string' && value.trim().length > 0,
+  },
+  distributionAccountSecret: {
+    type: 'string',
+    required: true,
+    description: 'Distribution account secret.',
+    validate: (value) => typeof value === 'string' && value.trim().length > 0,
+  },
   validate(config: SecurityConfig): void {
     if (!config) throw new Error('Missing required field: security');
-    if (!config.sep10SigningKey)
+    if (!SecurityConfigSchema.sep10SigningKey.validate(config.sep10SigningKey))
       throw new Error('Missing required secret: security.sep10SigningKey');
-    if (!config.interactiveJwtSecret)
+    if (!SecurityConfigSchema.interactiveJwtSecret.validate(config.interactiveJwtSecret))
       throw new Error('Missing required secret: security.interactiveJwtSecret');
-    if (!config.distributionAccountSecret)
+    if (!SecurityConfigSchema.distributionAccountSecret.validate(config.distributionAccountSecret))
       throw new Error('Missing required secret: security.distributionAccountSecret');
     if (
       config.enableClientAttribution !== undefined &&
diff --git a/tests/utils/server-config-schema.test.ts b/tests/utils/server-config-schema.test.ts
index e5202cc..c7cf5cd 100644
--- a/tests/utils/server-config-schema.test.ts
+++ b/tests/utils/server-config-schema.test.ts
@@ -1,5 +1,9 @@
 import { describe, expect, it } from 'vitest';
-import { ServerConfigSchema, validateServerConfig } from '../../src/utils/validation';
+import {
+  SecurityConfigSchema,
+  ServerConfigSchema,
+  validateServerConfig,
+} from '../../src/utils/validation';
 
 describe('ServerConfigSchema', () => {
   it('is publicly importable from validation module', () => {
@@ -157,3 +161,43 @@ describe('ServerConfigSchema public export', () => {
     expect(mod.ServerConfigSchema).toBeDefined();
   });
 });
+
+describe('SecurityConfigSchema', () => {
+  const requiredSecretFields = [
+    'sep10SigningKey',
+    'interactiveJwtSecret',
+    'distributionAccountSecret',
+  ] as const;
+
+  it('exposes the required secret fields', () => {
+    for (const field of requiredSecretFields) {
+      expect(SecurityConfigSchema).toHaveProperty(field);
+      expect(typeof SecurityConfigSchema[field].validate).toBe('function');
+    }
+  });
+
+  for (const field of requiredSecretFields) {
+    describe(`${field} field`, () => {
+      it('accepts a non-empty string without modifying it', () => {
+        const value = 's'.repeat(56);
+        expect(SecurityConfigSchema[field].validate(value)).toBe(true);
+        expect(value).toBe('s'.repeat(56));
+      });
+
+      it('rejects missing, empty, and whitespace-only values', () => {
+        expect(SecurityConfigSchema[field].validate(undefined)).toBe(false);
+        expect(SecurityConfigSchema[field].validate(null)).toBe(false);
+        expect(SecurityConfigSchema[field].validate('')).toBe(false);
+        expect(SecurityConfigSchema[field].validate('   ')).toBe(false);
+        expect(SecurityConfigSchema[field].validate('\t\n')).toBe(false);
+      });
+
+      it('rejects non-string values', () => {
+        expect(SecurityConfigSchema[field].validate(123)).toBe(false);
+        expect(SecurityConfigSchema[field].validate(true)).toBe(false);
+        expect(SecurityConfigSchema[field].validate({})).toBe(false);
+        expect(SecurityConfigSchema[field].validate([])).toBe(false);
+      });
+    });
+  }
+});