After you've signed up for Amazon SES, you'll need to obtain your AWS access keys if you want to access Amazon SES through the Amazon SES API, whether by the Query (HTTPS) interface directly or indirectly through an AWS SDK, the AWS Command Line Interface, or the AWS Tools for Windows PowerShell. The key will be displayed when these settings are saved and compulsory, copy the key to the clipboard, once you leave the page the key will not be visible. Client ID and the Key generated by Microsoft Azure from the App is the Client ID and Client Secret. For Example: The Client ID and Client Secret looks like.

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1. Dec 01, 2013  Compute a shared secret given your secret key and someone else's public key. Note: It is recommended that you hash the result of ecdhsharedsecret before using it for symmetric encryption or HMAC. Inputs: ppublicKey - The public key of the remote party. PprivateKey - Your private key. Outputs: psecret - Will be filled in with the shared.
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3. RandomKeygen is a free mobile-friendly tool that offers randomly generated keys and passwords you can use to secure any application, service or device. KEY RandomKeygen - The Secure Password & Keygen Generator.

A simple and secure ECDH and ECDSA library.

Features

• Supports Windows and Linux/*nix (needs /dev/urandom).
• Resistant to known side-channel attacks.
• Twice as fast as OpenSSL for ECDSA verify and ECDH.
• Written in C.
• No dynamic memory allocation.
• Support for 4 standard curves: secp128r1, secp192r1, secp256r1, and secp384r1
• BSD 2-clause license.

Usage

I recommend just copying (or symlink) ecc.h and ecc.c into your project. Then just #include 'ecc.h' to use the easy-ecc functions.

Function documentation

ecc_make_key

Create a public/private key pair.

Outputs:

• p_publicKey - Will be filled in with the public key.
• p_privateKey - Will be filled in with the private key.

Returns 1 if the key pair was generated successfully, 0 if an error occurred.

ecdh_shared_secret

Compute a shared secret given your secret key and someone else's public key.Note: It is recommended that you hash the result of ecdh_shared_secret before using it for symmetric encryption or HMAC.

Inputs:

• p_publicKey - The public key of the remote party.
• p_privateKey - Your private key.

Outputs:

• p_secret - Will be filled in with the shared secret value.

Returns 1 if the shared secret was generated successfully, 0 if an error occurred.

ecdsa_sign

Generate an ECDSA signature for a given hash value.

Usage: Compute a hash of the data you wish to sign (SHA-2 is recommended) and pass it in tothis function along with your private key.

Inputs:

• p_privateKey - Your private key.
• p_hash - The message hash to sign.

Outputs:

• p_signature - Will be filled in with the signature value.

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Returns 1 if the signature generated successfully, 0 if an error occurred.

ecdsa_verify

Verify an ECDSA signature.

Usage: Compute the hash of the signed data using the same hash as the signer andpass it to this function along with the signer's public key and the signature values (r and s).

Inputs:p_publicKey - The signer's public keyp_hash - The hash of the signed data.p_signature - The signature value.

Returns 1 if the signature is valid, 0 if it is invalid.

Home > Articles > Security > Network Security

1. Problems with Symmetric Algorithms

Modern computing has generated a tremendous need for convenient, manageable encryption technologies. Symmetric algorithms, such as Triple DES and Rijndael, provide efficient and powerful cryptographic solutions, especially for encrypting bulk data. However, under certain circumstances, symmetric algorithms can come up short in two important respects: key exchange and trust. In this chapter we consider these two shortcomings and learn how asymmetric algorithms solve them. We then look at how asymmetric algorithms work at a conceptual level in the general case, with emphasis on the concept of trapdoor one-way functions. This is followed by a more detailed analysis of RSA, which is currently the most popular asymmetric algorithm. Finally, we see how to use RSA in a typical program using the appropriate .NET Security Framework classes.

We focus on the basic idea of asymmetric algorithms, and we look at RSA in particular from the encryption/decryption point of view. In Chapter 5 we explore using the RSA and DSA asymmetric algorithms as they relate to authentication and integrity checking, involving a technology known as digital signatures. For a more thorough discussion of RSA from a mathematical point of view, please see Appendix B.

Problems with Symmetric Algorithms

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One big issue with using symmetric algorithms is the key exchange problem, which can present a classic catch-22. The other main issue is the problem of trust between two parties that share a secret symmetric key. Problems of trust may be encountered when encryption is used for authentication and integrity checking. As we saw in Chapter 3, a symmetric key can be used to verify the identity of the other communicating party, but as we will now see, this requires that one party trust the other.

The Key Exchange Problem

The key exchange problem arises from the fact that communicating parties must somehow share a secret key before any secure communication can be initiated, and both parties must then ensure that the key remains secret. Of course, direct key exchange is not always feasible due to risk, inconvenience, and cost factors. The catch-22 analogy refers to the question of how to securely communicate a shared key before any secure communication can be initiated.

In some situations, direct key exchange is possible; however, much commercial data exchange now takes place between parties that have never previously communicated with one another, and there is no opportunity to exchange keys in advance. These parties generally do not know one another sufficiently to establish the required trust (a problem described in the next section) to use symmetric algorithms for authentication purposes either. With the explosive growth of the Internet, it is now very often a requirement that parties who have never previously communicated be able to spontaneously communicate with each other in a secure and authenticated manner. Fortunately, this issue can be dealt with effectively by using asymmetric algorithms.¹

The Trust Problem

Ensuring the integrity of received data and verifying the identity of the source of that data can be very important. For example, if the data happens to be a contract or a financial transaction, much may be at stake. To varying degrees, these issues can even be legally important for ordinary email correspondence, since criminal investigations often center around who knew what and when they knew it. A symmetric key can be used to check the identity of the individual who originated a particular set of data, but this authentication scheme can encounter some thorny problems involving trust.

As you may recall from Chapter 3, in this technique the data is hashed, and the resulting hash is encrypted using a shared secret key with a symmetric algorithm. The recipient, who also knows the secret key, is sent the data along with the encrypted hash value. The recipient then decrypts the hash using the shared key, and the result is verified against a fresh recalculation of the hash value on the data received. This works because only someone who knows the secret key is capable of correctly encrypting the hash of the original data such that it will match the recalculated hash value computed by the recipient. This verifies the identity of the data source. As an added bonus, this technique verifies data integrity in that any individual who is ignorant of the secret key could not have tampered with the data.

This is great if you have the luxury of establishing the shared secret beforehand, but there is an additional problem here. What if you cannot trust the other party with whom you have shared the secret key? The problem is that this scheme cannot discriminate between the two individuals who know the shared key. For example, your pen pal may fraudulently send messages using your shared key, pretending to be you. This would allow your friend to write IOUs to himself in your name, making this scheme useless in any trust-lacking relationship. Other problems could arise if your partner shared the secret key with others without telling you about it. Suddenly, you would have no leg to stand on if certain disputes were to arise. For example, your partner could renege on a contract by claiming that someone else must have obtained the key from you and signed off on a deal in his name. This problem is known as repudiation,² and we often need a way to enforce nonrepudiation between untrusting parties. The basic problem with all this is that any symmetric algorithm scheme requires that one party can safely trust the other party, which often is not realistic.

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Fortunately, asymmetric algorithms can be used to solve these problems by performing the same basic operations but encrypting the hash using a private key (belonging to an asymmetric key pair) that one individual and only one individual knows. Then anyone can use the associated public key to verify the hash. Windows product keys free. This effectively eliminates the problems of trust and repudiation.³This technique is called a digital signature, which is the main topic of the next chapter.

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