PPT Slide

Notes

Message Digest

• Message digest is a cryptographic hash algorithm added to a message

• One-way function

• Analogy with CRC

• If the message is tampered with the message  digest at the receiving end fails to validate

• MD5 (used in SNMPv3) commonly used MD

• MD5 takes a message of arbitrary length (32-Byte) blocks and generates 128-bit message digest

• SHS (Secured Hash Standard) message digest  proposed by NIST handles 264 bits and generates 160-bit output

Example:

Network Management: Principles and Practice

© Mani Subramanian 2000

13-53

Chapter 13

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