digital signature

April 8, 2023

Security is the condition of being protected against danger or loss.

ASPECT OF SECURITYAuthenticationPrivacyIntegrityNo Repudiation

03/19/08 2

1. SSL –Secured Socket Layer

2. Protocol for data encryption .

3. Open & nonproprietary protocol .

4. Current implementation-OpenSSL

5. used for:

1. data-encryption

2. server authentication

3. data integrity

4. client authentication

03

/19

/08

3

Infrastructure -uses digital certificates as an authentication mechanism.

Manage certificates and their associated

keys.

Provides public-key encryption & digital signature services.

Establishes and maintains a trustworthy networking environment.

April 8, 2023

Hash Hash Function Function

Jrf843kjfgf*£Jrf843kjfgf*£$&Hdif*7oUsd*&@$&Hdif*7oUsd*&@:<CHDFHSD:<CHDFHSD(**(**

Py75c%bn&*)9|Py75c%bn&*)9|fDe^bDFaq#xzjFr@g5fDe^bDFaq#xzjFr@g5=&nmdFg$5knvMd’rkv=&nmdFg$5knvMd’rkvegMs”egMs”

This is a really long This is a really long message about Bill’s…message about Bill’s…

AsymmetricAsymmetricEncryptionEncryption

Message or FileMessage or File Digital SignatureDigital Signature128 bits Message Digest128 bits Message Digest

Calculate a short Calculate a short message digest from message digest from

even a long input even a long input using a one-way using a one-way message digest message digest function (hash)function (hash)

Signatory’s Signatory’s privateprivate key key

privatprivatee

Verifying a Digital SignatureJrf843kjfJrf843kjfgf*£$&Hdgf*£$&Hdif*7oUsdif*7oUsd*&@:<CHD*&@:<CHDFHSD(**FHSD(**

Py75c%bn&*)Py75c%bn&*)9|fDe^bDFaq9|fDe^bDFaq#xzjFr@g5=#xzjFr@g5=&nmdFg$5kn&nmdFg$5knvMd’rkvegMs”vMd’rkvegMs”

Py75c%bn&*)Py75c%bn&*)9|fDe^bDFaq9|fDe^bDFaq#xzjFr@g5=#xzjFr@g5=&nmdFg$5kn&nmdFg$5knvMd’rkvegMs”vMd’rkvegMs”

AsymmetricAsymmetricdecryption decryption (e.g. RSA)(e.g. RSA)

Everyone has Everyone has access to trusted access to trusted public key of the public key of the signatorysignatory

Signatory’s Signatory’s publicpublic keykey

Digital SignatureDigital Signature

This is a This is a really long really long message message about Bill’s…about Bill’s…

Same hash functionSame hash function(e.g. MD5, SHA…)(e.g. MD5, SHA…)

Original MessageOriginal Message

Py75c%bn&*)Py75c%bn&*)9|fDe^bDFaq9|fDe^bDFaq#xzjFr@g5=#xzjFr@g5=&nmdFg$5kn&nmdFg$5knvMd’rkvegMs”vMd’rkvegMs”

Py75c%bn&*)Py75c%bn&*)9|fDe^bDFaq9|fDe^bDFaq#xzjFr@g5=#xzjFr@g5=&nmdFg$5kn&nmdFg$5knvMd’rkvegMs”vMd’rkvegMs”

? == ?? == ?Are They Same?Are They Same?

03/19/08 7

Certificate:

body of data placed in a message to serve as Proof of the sender’s authenticity. consists of encrypted information that associates a public key with the true identity of an individual

Includes the identification and electronic signature of Certificate Authority (CA).

Includes serial number and period of time when the certificate is Valid

03/19/0803/19/08 88

Certificate Authority :

trusted organization that issues certificates for both servers and clients.

create digital certificates that securely bind the names of users to their public keys.

Two types of CA:

* Commercial CA* Self-certified private CA

April 8, 2023

Types of certificates

Root

CERT

eeeee

SERVER

CERT

CLIENT

CERT

OBJ ECT

SIGNING

CERT

OBJ ECT

CERT

April 8, 2023

VERSION

CERTIFICATE SERIAL NO

ALGORITHM

PARAMETER

ISSUER NAME

NOT BEFORE

NOT AFTER

SUBJECT NAME

ALGORITHMS

PARAMETERS

KEY

ISSUER UNIQUE IDENTIFIER

SUBJECT UNIQUE IDENTIFIER

EXTENSION

ALGORITHMS

PARAMETERS

ENCRYPTED

Signature algorithm identifier

validity

signature

Subject public key

info

x.509

April 8, 2023

Client server repository

At client site

Client

Install the certificate in

Signature repository

Server

Registratio

n

office

Registration

form

Registratio

n authority

Certifica-

te

Authority

Trusted root certificate repository

4

3

9

10

8

6

Publish its certificate

for global access

5

7

15

1

14

2

Exchange of

certificate for

authentication 11

12 133

16

Revocation

repository

Certificate reepository

Login repository

Registration repository

WELCOME TO TKT CERT HOME LOGIN POLICY RENEW GUIDELINES

MYCERTIFICATE

TKTCert is a Web of Trust. It is a certificate Authority Which provides digital certificates to clients who need security at optimum level..

Information exchange with this site can,t be viewed or changed by third party..

Do you want to continue??

YES NO VIEW CERTIFICATE

HOME LOGIN POLICY RENEW GUIDELINE MYCERTIFICATE

LOGIN

User Name: Passphrase:

[sign up for new account?] [lost your password?]

LOGIN

HOME LOGIN POLICY RENEW GUIDELINE MYCERTIFICATE

Welcome to your Account of TKT cert.com

ABOUT ME MY DETAILS TYPES OF CERTIFICATES PURPOSE GUIDELINES

LOST PASSPHRASE

Email Address:

Date of birth:

Next

LOST PASSPHRASEQuestion 1st : Question 3rd :

Question 5th :

NEXT

TKTCert will randomly generate a complex passphrase and send it to clients Email-address..

April 8, 2023

HOME LOGIN POLICY RENEW GUIDELINES MYCERTIFICATE

TKT CERT certificate will be shown:

REGISTRATION FORM

April 8, 2023

TKT Cert Certificate Registration Form REG NO. First Name Last Name Email Address Pass Phrase: State Country Company Name City What is your domain name you wish to secure? What is time period for issuing certificate? Please fill at least five questions to verify yourself 1 2 3 4 5 Please remember my profile information. Please keep me up to date on securely alerts via email Agree certificate all terms and conditions.

Continue

HOME LOGIN POLICY RENEW GUIDELINES MYCERTIFICATE

Your password has been updated

and your loginId has been notified of the change !!

Edit your Profile

Change your Passphrase

New Profile:

First name : Last name :

Email address :

State :

Country :

Company name :

Period of validity :

April 8, 2023

My profile details is shown:

First name : abc Last name

Email address : abc@gmail.com

State : Maharashtra

Country : India

Company name : IBM

Period of validity : 30 days.

April 8, 2023

Password ver ification

Login repository

Coded password

Password Password Ok

Access to a CA is allowed

Client

Verify

Login

successful

April 8, 2023

1.

Registration

office

Client

Registration

authority

server

Certificate

authority

Certificate

repository

Browser

1

33

4

6 8

9

10

110100

12

Certificate signing request

Registration

repository

Login

repository

2

5

7

April 8, 2023

Certificate signing request Browser registration repository login repos

Request Access installs forward takes store store login & Certificate certificate blank form word Form fills with details domain forward form form Passphrase verify Blank form Client detail Fwd Blank form Forwards filled form Verified account detail Global certificate authority certificate exchange certificate & throws client certificate Store Certificate repo

Client Server Registration

offi ce Registration

authority Check

s

Submit

Verify

CA

Generate

eee

April 8, 2023

April 8, 2023

Certificate ver ification

Invalid Invalid Invalid Invalid

Certif valid valid valid valid

Path valid

Verified

Not valid certificate

Client CA Type

check

Expiry

check Integrit

y check Certificate

path check

Certificate

valid Client

Certificate

invalid

April 8, 2023

N

BROWSER

INTERMMEDIATE

CA-X INTERMMEDIATE

CA-Y

ROOT CA -A

ROOT CA -B

WEB SERVER1 WEB SERVER1

CERTIFICATE CA-B

CERTIFICATE CA-Y

CERTIFICATE WEB SERVER

Root hierarchy

April 8, 2023

Browser

Root hierarchy

Certificate

Certificate

Own CA path

Certificate certificate Throws its

Certificate

Verified

Access services fetch CA Repo

Root CA Dispatch Client Install

Verify Request

Web server

April 8, 2023

Web services

Web server

CA

CA

repos.

server

CERTIFICAT

-E

Exchange of

CERT.

CLIENT CERT.

+ request

ree CLIENT CERT. &

Request 1

2

4

6

Web-service

CERTFICATE 3

3

7

Client site

Client cert.

5

April 8, 2023

Browser

Request client certificate&

Request

Service Provided

Provided web-service certificate

Verified certificate certificate repo

Provide Service Fetches certi

Self certificate fetch certi.

Client cert. Submits certi.

Client cert+ request

Server cert. Verified certificate

Client Web server

Exchange

exExchan

ge

Web-

Services

Verification CA

April 8, 2023

Exchange of Encrypted certificates

Secure interaction starts

CERTIFICATE

AUTHORITY

CA

REPOSITORY

CLIENT 1 CLIENT 2

4 3

Tw o client interaction from one CA

1

2 5

6 7

April 8, 2023

Decrypted certificate

Encrypted c lient2 certificate encrypted client certificate +

+ CA public key CA repository CA public key

Client certificate request its own certif...

Request its own cert.

Own private +client certificate

sends sends

Encrypted certificate encrypted certificate

Encrypted certificate exchange with each other

Client 1 CA Client 2

Verification

Decrypt

Encryption

Exchange

April 8, 2023

CA 1 CA 2 CA 1

CERTIFICATE

REPOSITORY

CA 2

CERTIFICATE

REPOSITORY

CLIENT CLIENT

2

3

5

Two client interaction from different CA

1

4

April 8, 2023

Decrypt

C1

CA1 CA2

C2

CA1 Repository

Global Repository

CA2 Repository

Fe

tch

CA

2

ce

rtif.

Request for CA2 certif.

CertifCA2

Certif+public key of sender

Fetc

h

C2

c

ertif

.

Secure communication

April 8, 2023

4

5 7

6

9

CERTIFICA- TE

AUTHORITY

8 2 CERTIFICATE

REPOSITORY

1

3

CLIENT1 CLIENT2

10

April 8, 2023

CA Verification

Append Encrypt

C1

Hashing

Encrypt

signature

Encrypt C2

REPOSITORY

Digest + private key

Signed digest+message

Fetch c lient certificate

Encrypted certificate

Certif+public key of c2

Signature sent

Sign+certificate

Sign+certificate

Priv key+sign+certif.

April 8, 2023

57

PGP at the sender site

April 8, 2023 58

PGP at the receiver site

Database Schema

April 8, 2023

Registration no

Registration form

CSR Date

Date of Registration

Customer_id

Login Name

Password

Registration no

Registration Repository Login Repository

April 8, 2023

Certificate Serial No

Type of Certificate

Customer_id

Date of Issue

Expire Date

Registration no

certificate

Certificate serial no

Expire Date

Revocation Date

Certificate

Certificate Repository Revocation Repository

April 8, 2023

Message_id

Signature

Validity

Algorithm

Certificate Serial no

Root_id

Certificate Serial no

CA name

Date of Publish

Certificate

Signature Repository Trusted root Certificate Repository

Platform & software tools required:

Os : LINUX RHEL5

Language :PHP/HTML

Database :MySQL

Server :Apache-Web Server

Protocols :PGP

IDE used :ECLIPSE

Tools&Utilities : GNUPG, GPG,OPENSSL,DOVECOT