Security PGP / Pretty Good Privacy. SANOGXXX July, 2017 Gurgaon, Haryana, India
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1 Security PGP / Pretty Good Privacy SANOGXXX July, 2017 Gurgaon, Haryana, India Issue Date: [ ] Revision: [V.1]
2 Security issues for Confidentiality Network admin can read your . Webmail provider can read your . LAN user may read your by monitoring tool. Even in some hotel, I could have chance to read other rooms internet traffic. Integrity contents may be changed by some attacker on the network. Authenticity Easy to set any headers like From. Any other headers can be set anything you want. Difficult to know it is true.
3 Targeted Attack Attacks on information security which seek to affect a specific organization or group, rather than indiscriminately. Some may be customized for a specific target organization or group. An with suspicious file attached Executable binary Word document file Database application file
4 Targeted Attack To: your address From: Fakrul Alam Subject: my request Hello, I have been looking for someone who can answer questions of the attached file. I hope you can do that and reply me. Thanks!
5 Example of Spoof Mail
6 Cryptography Symmetric and Asymmetric (public-key) The latter is widely accepted PGP is based on Asymmetric (Public-Key) Encryption
7 Symmetric Encryption Involves only one key, which is used by both the sender for encrypting and the recipient for decrypting Symmetric algorithms: blowfish, Triple-DES, AES (Advanced Encryption Standard), CAST (Carlisle Adams and Stafford Tavares), IDEA (International Data Encryption Algorithm, legally restricted, but the other algorithms may be freely used) Problem: the means of distributing the key
8 Asymmetric (Public-Key) Encryption Solves the problem of distributing keys by using one pair of complimentary keys, one public and the other private. Public: freely exchanged to others without fear of compromising security. Private: only you have access, should be carefully protected. A message is encrypted to a recipient using the recipient's public key, and it can only be decrypted using the corresponding private key.
9 Asymmetric Encryption Refresher One key mathematically related to the other. Public key can be generated from private key. But NOT vice versa. If you encrypt data with the public key, you need to private key to decrypt You can sign data with the private key and verify the signature using the public key
10 Keys Private key is kept SECRET. You should encrypt your private key with a symmetric passphrase. Public key is distributed. Anyone who needs to send you confidential data can use your public key
11 Signing & Encrypting Data is encrypted with a public key to be decrypted with the corresponding private key. Data can be signed with the private key to be verified by anyone who has the corresponding public key. Since public keys are data they can be signed too.
12 How PGP Works
13 Trust Centralized / hierarchal trust where certain globally trusted bodies sign keys for every one else. Decentralized webs of trust where you pick who you trust yourself, and decide if you trust who those people trust in turn. Which works better for what reasons?
14 Sample Web of Trust
15 PGP by GnuPG Create your keys Public key Private key (secret key) Identify key by Key ID (like 0x23AD8EF6) Verify others public key by Key fingerprint Find keys on PGP key servers Like
16 Key Management Using graphical tools based on what you installed above: GPG Keychain Access for OS X Kleopatra or GPA for windows Using the command line: gpg --list-keys
17 Key Management On printed media: published book or business cards: Digitally in or using sneaker-net Online using the openpgp key servers. Still does not tell you if you trust the key.
18 Key Management Expiry dates ensure that if your private key is compromised they can only be used till they expire. Can be changed after creating the key. Before expiry, you need to create a new key, sign it with the old one, send the signed new one to everyone in your web of trust asking them to sign your new key.
19 Key Management - Revocation Used to mark a key as invalid before its expiry date. Always generate a revocation certificate as soon as you create your key. Do not keep your revocation certificate with your private key. gpg --gen-revoke IDENTITY
20 Key Management - Partying Key signing parties are ways to build webs of trust. Each participant carries identification, as well as a copy of their key fingerprint. (maybe some $ as well J ) Each participant decides if they re going to sign another key based on their personal policy. Keys are easiest kept in a keyring on an openpgp keyserver in the aftermath of the party.
21 Installing GnuPG Software Core software either commercial from pgp or opensource from gnupg. for windows for OS X Your package manager for Linux/UNIX Source code from
22 How PGP Works
23 How PGP Works
24 Create Public & Private key pairs for GnuPG.
25 Create public & private key pair
26 Create public & private key pair
27 Create public & private key pair
28 Create public & private key pair
29 Create public & private key pair
30 Create public & private key pair
31 Sign messages & verify it
32 Sign messages & verify it
33 Sign messages & verify it
34 Export / Import Public Key
35 Export / Import Public Key
36 Export / Import Public Key
37 Encrypt Message
38 Encrypt Message
39 Decrypt Message
40 LAB
41 PGP Extension for Webmail Mailvelope
42 Mailvelope OpenPGP Encryption for Webmail Mailvelope integrate directly into the Webmail user interface Supports Gmail Yahoo Outlook GMX Browser Chrome Extension Firefox Addon 42
43 Mailvelope : Chrome Extension 43
44 Mailvelope : Display Keys 44
45 Mailvelope : Import Keys 45
46 Mailvelope : Generate Key 46
47 Mailvelope : File Encryption/Decryption 47
48 Mailvelope : Encrypt Mail 1 To compose message click on the notepad icon 3 Now you have encrypted mail 2 Type your message click Encrypt 48
49 Mailvelope : Dencrypt Mail 1 You will see encrypted mail 2 Click on the lock, it will ask for passphrase and you will get the decrypted mail 49
50 For others Enigmail + GnuPG for on Thunderbird
51 Encrypt Facebook Communication settings > security > public key 51
52 Encrypt Facebook Communication 52
53 For Organization GPG Sync shttps://firstlook.org/code/project/gpg-sync/ 53
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