I 
  Cryptography


We are using Elliptic Curve Cryptography and Advanced Encryption Standard (AES) with 256 bits to do voice encryption. We bring to the market one of the best solutions to protect your phone calls.

Our encryption technology
SecVoice Secure Phone does key exchange using Elliptic Curve Diffie-Hellman(ECDH) Koblitz 571 bits (as secure as Diffie-Hellman with 15.000 bits) and Advanced Encryption Standard with h of 256 bits CBC mode.
 

  About encryption technology

 The voice encryption products that do key exchange cryptography use two different encryption inside them to protect your calls.
  1. The first encryption is called "Key exchange" and have the purpose of sharing a common key known only by the two SecVoice Secure Phone users and not by outsiders.
  2. After the two users have a common shared key, the system will use this common key and another encryption technology called "Symmetric Encryption" to secure your voice communication.

When using two encryption technologies inside one product, we must deal with this important question: What is the less secure technology i am using inside? Because any attacker will choose your weakness to defeat your security.

For example:

  1. If your system uses a weak key exchange and a strong symmetric encryption, the attacker will choose the key exchange to defeat you.
  2. If your system uses a strong key exchange cryptography but have a weaker symmetric encryption, you will be defeated by the symmetric encryption weakness.

Your less secure encryption will be your final security, because you will be defeated more easily by your weakness.
The bellow table compares the symmetric encryption security with two key exchange technologies used in the market today. One of them is the Diffie-Hellman / RSA technology, and the other is the Elliptic Curve Cryptography.
In the first column you will have the symmetric encryption key lengths, and will be used as a reference. You will have more security if you use bigger keys.
For each symmetric key length, you have the equivalent key sizes that must be used by the key exchange technology to achieve the same level of security of the symmetric encryption.

Symmetric Encryption
key length

RSA/Diffie Hellman
key length

 Elliptic Curve
key length
80 1024 163
112 2048 224
128 3072 283
192 7680 409
256 15360 571

Taking a look at this table, you will see in the last line that a 15.360 bits Diffie-Hellman has the same 571 bits Elliptic Curve security, and both will have the same 256 bits symmetric key security.

Now we will compare our product with other products specifications in the market.

Product A
Key Exchange Symmetric encryption
2048 bits Diffie-Hellman 256 bits
Coments
The Product-A has a 256 bits symmetric key length , but its 2048 bits Diffie-Hellman key exchange length brings the product final security to only 112 bits.
Final security
112 bits of symmetric encryption security


Product B
Key Exchange Symmetric encryption
4096 bits Diffie-Hellman 256 bits
Coments
The Product-B has a 256 bits symmetric key length , but its 4096 bits Diffie-Hellman Key exchange lenght will bring the final product security below 160 bits.
Final security
160 bits of symmetric encryption security


SECVOICE SECURE PHONE
Key Exchange Symmetric encryption
571 bits Elliptic curve 256 bits
Coments
SecVoice Secure Phone has its key exchange and symmetric encryption key length with the same final security, equivalent to a 256 bits symmetric encryption.
Final security
256 bits of symmetric encryption security

We carefully choose the best of the key exchange and symmetric encryption, using some of the best encryption technologies available today.