Cryptography. Introduction Encryption The art (or science) of putting messages into a code, and the...

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Cryptography

Transcript of Cryptography. Introduction Encryption The art (or science) of putting messages into a code, and the...

Page 1: Cryptography. Introduction Encryption The art (or science) of putting messages into a code, and the study of those coding techniques. Decryption The.

Cryptography

Page 2: Cryptography. Introduction Encryption The art (or science) of putting messages into a code, and the study of those coding techniques. Decryption The.

Introduction

EncryptionThe art (or science) of putting messages into

a code, and the study of those coding techniques.

DecryptionThe means by which to bring out the meaning

from a coded message.

Page 3: Cryptography. Introduction Encryption The art (or science) of putting messages into a code, and the study of those coding techniques. Decryption The.

Simple Techniques

Original text “testing” Reversing text

“gnitset” Shifting text

“uftujoh” Flipping text

“ettsnig” Caeser cipher

Multi-shift (this one is by 2) “vguvkpi”

Examples

Page 4: Cryptography. Introduction Encryption The art (or science) of putting messages into a code, and the study of those coding techniques. Decryption The.

Cryptography Public Key Encryption

You create a private key/public key pair If a message is encrypted with your private key, only your public

key will decrypt it Publish your public key on web sites or send it to people via e-mail

Uses If you want to send a private message to another person, encrypt it

with their public key (only they can decrypt it with their private key) Digital Signatures

Encrypt with your private key first and then their public key

PGP (Pretty Good Privacy) One version of this technology

Example


Encryption / Decryption on FPGA Final Presentation

Encryption / Decryption on FPGA Final Presentation

RSA Ramki Thurimella. 2 Public-Key Cryptography Symmetric cryptography: same key is used for encryption and decryption. Asymmetric cryptography: different.

RSA Ramki Thurimella. 2 Public-Key Cryptography Symmetric cryptography: same key is used for encryption and decryption. Asymmetric cryptography: different.

Cryptosystems and Symmetric Encryption/Decryption)

Cryptosystems and Symmetric Encryption/Decryption)

Modern Cryptography. The Enigma Machine German encryption and decryption machine used in WWII Essentially a complex, automated substitution cipher.

Modern Cryptography. The Enigma Machine German encryption and decryption machine used in WWII Essentially a complex, automated substitution cipher.

Secured algorithm for gsm encryption & decryption

Secured algorithm for gsm encryption & decryption

AES Encryption and Decryption

AES Encryption and Decryption

Cryptography Readings Encryption, Decryption, & Digital Certificates.

Cryptography Readings Encryption, Decryption, & Digital Certificates.

AES Encryption/Decryption Using RT5xx

AES Encryption/Decryption Using RT5xx

Encryption & decryption of sound presentation

Encryption & decryption of sound presentation

Cryptography Encryption/Decryption Franci Tajnik CISA Franci Tajnik.

Cryptography Encryption/Decryption Franci Tajnik CISA Franci Tajnik.

Encryption and Decryption using Password Based Encryption ...

Encryption and Decryption using Password Based Encryption ...

Quantum Cryptography: A Surveydcm/Teaching/COT4810-Fall 2012/Literature... · Quantum Cryptography: A Survey ... particular information used for encryption or decryption in an individual

Quantum Cryptography: A Surveydcm/Teaching/COT4810-Fall 2012/Literature... · Quantum Cryptography: A Survey ... particular information used for encryption or decryption in an individual

Image encryption and decryption

Image encryption and decryption

Security Improvement in Elliptic Curve Cryptography...attack. Finally, the dual encryption/decryption algorithm is implemented using different session keys in each stage of the encryption

Security Improvement in Elliptic Curve Cryptography...attack. Finally, the dual encryption/decryption algorithm is implemented using different session keys in each stage of the encryption

Covert Cryptography and Steganography - TU Dublin3 Multiple Encryption • Uses many locks or Keys Kn •Based on application of the same encryption/decryption algorithm E/D •Used

Covert Cryptography and Steganography - TU Dublin3 Multiple Encryption • Uses many locks or Keys Kn •Based on application of the same encryption/decryption algorithm E/D •Used

Quick Cryptography Intro - WordPress.com · Usually, cryptography just assumes the encryption E and decryption D functions are known. The problem is how to share keys... No sharing

Quick Cryptography Intro - WordPress.com · Usually, cryptography just assumes the encryption E and decryption D functions are known. The problem is how to share keys... No sharing

Data Encryption and Decryption by Using Triple DES and ....pdf · Encryption and decryption with DES 2. Overview of Encryption and Decryption Encryption is a process of coding information

Data Encryption and Decryption by Using Triple DES and ....pdf · Encryption and decryption with DES 2. Overview of Encryption and Decryption Encryption is a process of coding information

Encryption device, encryption method, decryption device ...

Encryption device, encryption method, decryption device ...

DES EXAMPLE (encryption + decryption)

DES EXAMPLE (encryption + decryption)

Cryptography. Basic Terminology ● Cryptography means secret writing ● Encryption means converting plaintext into ciphertext o hello → khoor ● Decryption.

Cryptography. Basic Terminology ● Cryptography means secret writing ● Encryption means converting plaintext into ciphertext o hello → khoor ● Decryption.