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Android Application Security Essentials

You're reading from Android Application Security Essentials Security has been a bit of a hot topic with Android so this guide is a timely way to ensure your apps are safe. Includes everything from Android security architecture to safeguarding mobile payments.

Product type Paperback

Published in Aug 2013

Publisher Packt

ISBN-13 9781849515603

Length 218 pages

Edition 1st Edition

Languages

Java

Tools

Android

Concepts

Application Security

Author (1):

Pragati Rai

View More author details

Table of Contents (12) Chapters

Preface

1. The Android Security Model – the Big Picture FREE CHAPTER

2. Application Building Blocks

3. Permissions

4. Defining the Application's Policy File

5. Respect Your Users

6. Your Tools – Crypto APIs

7. Securing Application Data

8. Android in the Enterprise

9. Testing for Security

10. Looking into the Future

Index

Message Authentication Codes

A Message Authentication Code (MAC) is a tag or checksum that is appended to a message to ascertain its authenticity and integrity. Authentication is provided by the possession of a secret key, and verifying accidental or intentional changes in the message provides integrity. The following figure illustrates the working of a MAC:

A MAC can be generated using different methods: by using a one time pad or one time secret key, by using a hash function, and by using a stream cipher or by using a block cipher and output the final block as a checksum. An example of the last method is DES with the CBC mode.

A hash function is used to create a checksum called Hashed MAC (HMAC). This hash is then encrypted with a symmetric key and appended to the message. This is the most popular method of generating the MAC. Some examples of this kind of MAC are AES 128 with SHA1 and AES 256 with SHA1.

Android provides the capability to generate an HMAC by using the javax.crypto.Mac class...

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Authors (1)

Pragati Rai

Pragati Rai

Pragati Ogal Rai is a technologist with more than 14 years of experience in mobile operating systems, mobile security, mobile payments, and mobile commerce. From working as a platform security engineer with Motorola Mobility, to designing and developing PayPal's mobile offerings, she has an extensive end-to-end experience in all aspects of mobile technology.Pragati has a dual Master's in Computer Science and has taught and trained computer science students at different levels. She is a recognized speaker at international technology events.

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