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INFORMATION SECURITY NOTES


PROVIDING LECTURE NOTES ON INFORMATION SECURITY, THE TOPICS IT COVERS ARE
CLASSIC CRYPTO, SYMMETRIC CRYPTOGRAPHY, ASYMMETRIC CRYPTOGRAPHY, HASH FUNCTIONS,
ENCRYPTION, DECRYPTION, DIGITAL SIGNATURE, DIGITAL CERTIFICATE, ETC.. COPYING
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PROS AND CONS OF SYMMETRIC KEY CRYPTOGRAPHY


MORE ABOUT DATA ENCRYPTION STANDARD (DES) AND ADVANCED ENCRYPTION STANDARD (AES)

2


ADVANCED ENCRYPTION STANDARD (AES)


DATA ENCRYPTION STANDARD (DES) ALGORITHM

3


FEISTEL CIPHER

1


RC4 ALGORITHM (SYMMETRIC STREAM CIPHER)

8


A QUICK GLOSSARY OF COMMON TERMS USED IN INFORMATION SECURITY (CRYPTOGRAPHY)


LINEAR FEEDBACK SHIFT REGISTER WITH EXAMPLE


A5/1 SYMMETRIC CRYPTOGRAPHY ALGORITHM

1


WHAT HAPPENS IF THE KEYSTREAM REPEATS? DOES IT HAMPER SECURITY?


XOR LOGIC

1


SYMMETRIC (SECRET KEY/PRIVATE KEY) CRYPTOGRAPHY

7


MODERN CRYPTOGRAPHY AND ITS TYPES

1


CLASSIC CIPHERS (PART 2)


CRYPTO BASICS

1


INFORMATION SECURITY GOALS

1


INFORMATION SECURITY BASICS

10
Apr
29



PROS AND CONS OF SYMMETRIC KEY CRYPTOGRAPHY


PROS AND CONS OF SECRET KEY CRYPTOGRAPHY






ADVANTAGES OF SECRET KEY CRYPTOGRAPHY

 1. It can be extremely secure.
 2. It is relatively easy than public key encryption.
 3. Since the system only needs to perform a single, reversible mathematical
    equation to encrypt or decrypt a file, the process is almost transparent.
 4. It is extremely fast.
 5. A different secret key is used for communication with every different party.
    Only the messages between a particular pair of sender and receiver are
    affected if a key is compromised. Communications with other people are still
    secure.       


DISADVANTAGES OF SECRET KEY CRYPTOGRAPHY

 1. The biggest problem with symmetric key encryption is that you need to have a
    way to share the key to the party with whom you are sharing data. Encryption
    keys aren't simple strings of text like passwords. They are essentially
    blocks of gibberish.
 2. The number of keys required for communication among parties is too large as
    a different secret key is used for communication with every different party.
 3. Cannot provide digital signatures that cannot be repudiated.




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Posted 29th April 2021 by POOJA BAJAJ


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