CN103458296B - Intelligent set top box safe key generates method - Google Patents

Abstract

The invention discloses a kind of intelligent set top box safe key and generate method, by the key generator stochastic generation random number sequence { R in Intelligent set top box_n}；With { R_nIt is that the clear data of double secret key Intelligent set top box carries out first order encryption, the ciphertext data of output Intelligent set top box；Re-use root key to random number sequence { R_nCarry out second level encryption, export the random number sequence { R after encryption_n, as the key data of Intelligent set top box.Random number sequence { the R that the present invention generates_n, there is good random performance and spectral characteristic, it is possible to increase substantially the security performance of Intelligent set top box, it is ensured that accurately carrying out of Intelligent set top box charging, have a good application prospect.

Description

Intelligent set top box safe key generates method

Technical field

The present invention relates to encryption method technical field, be specifically related to a kind of Intelligent set top box safety close Key generates method.

Background technology

Along with deepening continuously of the broadcasting and TV integration of three networks, some value-added services need charge, in order to carry The security performance of high accounting module, the accounting module in Intelligent set top box all has hardware to encrypt, just Being to be solidificated in by key in the chip that chip manufacturer produces, this kind of cipher mode is fairly simple, very Easily crack, then, occur the key solidified in the chips in Intelligent set top box on the market Carrying out two grades of encryptions, cipher mode is software cryptography, at present, in existing Intelligent set top box Random number used by software cryptography, the general random function using computer to carry generates, we Knowing that random number is the important component part of security system, the performance of random number directly influences peace Quan Xing, but the random number that this mode generates becomes pseudo random number, random performance and spectral characteristic The most poor, security performance is not done, and easily deciphers, and causes the effect that key carries out two grades of encryptions Fruit is the best.

Summary of the invention

Solved by the invention technical problem is that overcomes existing random for key soft encryption Number, is the pseudo random number of the random function generation using computer to carry, random performance and frequency spectrum Characteristic is the most poor, and security performance is not done, and easily deciphers, and causes key carries out two grades of encryptions The problem of poor effect.

In order to solve above-mentioned technical problem, the technical solution adopted in the present invention is:

A kind of intelligent set top box safe key generates method, it is characterised in that: comprise the following steps,

Step (A), by the random number sequence of key generator stochastic generation in Intelligent set top box Row { R_n}；

Step (B), with random number sequence { R_nIt it is the clear data of double secret key Intelligent set top box Carry out first order encryption, the ciphertext data of output Intelligent set top box；

Step (C), uses root key to random number sequence { R_nCarry out second level encryption, defeated Go out the random number sequence { R after encryption_n, as the key data of Intelligent set top box.

Aforesaid intelligent set top box safe key generates method, it is characterised in that: described key is raw Grow up to be a useful person stochastic generation random number sequence { R_nGeneration method be,

Step (A1), if sequence vector { SⁿBe,

$S^{n+1}=\[(S_{13}^n+S_{14}^n)\mathrm{mod}b,S_0^n,S_1^n,S_2^n...S_{i-1}^n\]$

Wherein,For sequence vector { SⁿI-th component, i in the range of 0≤i≤14, Initial vector S⁰For

S⁰=[65535,0,0,65535,0,65535,0,65535,0,0,0,0,0,0,0], Mod is modulo operation, b=65536；

Step (A2), if ordered series of numbers F_nFor,

Wherein mod is modulo operation, b=65536；

Step (A3), if number sequence W_nMeet formula (1),

Wherein a=40307, b=65536, W₀With C₀For initial random seeds number, meet 0 ＜ W₀＜ b and 0 ＜ C₀＜ a, mod are modulo operation, ● for downward rounding operation；

Step (A4), by ordered series of numbers F_nAnd number sequence W_nStep-by-step XOR, obtains random number sequence { R_n} For,

$R_n=W_n\⊕F_n$

Wherein n ∈ Z and n >=0, Z is integer field,For step-by-step XOR.

The invention has the beneficial effects as follows: the intelligent set top box safe key of the present invention generates method, By the key generator stochastic generation random number sequence { R in Intelligent set top box_n}；To intelligence The clear data of Set Top Box carries out first order encryption, the ciphertext data of output Intelligent set top box, goes back Use root key to random number sequence { R_nCarry out second level encryption, export after encryption Random number sequence { R_n, as the key data of Intelligent set top box, it is random that the present invention generates Number Sequence { R_n, there is good random performance and spectral characteristic, it is possible to increase substantially intelligence The security performance of energy Set Top Box, it is ensured that accurately carrying out of Intelligent set top box charging, has good Application prospect.

Accompanying drawing explanation

Fig. 1 is the flow chart of the intelligent set top box safe key generation method of the present invention.

Fig. 2 is the random number sequence { R of the present invention_nGenerate method flow chart.

Fig. 3 is the random number sequence { R that the present invention generates_nSpectral characteristic figure.

The random number sequence that the random function using computer to carry that Fig. 4 is traditional generates Spectral characteristic figure.Detailed description of the invention

Below in conjunction with Figure of description, the present invention is further illustrated.

As it is shown in figure 1, the intelligent set top box safe key of the present invention generates method, including

Step (A), by the random number sequence of key generator stochastic generation in Intelligent set top box Row { R_n}；

Step (B), with random number sequence { R_nIt it is the clear data of double secret key Intelligent set top box Carry out first order encryption, the ciphertext data of output Intelligent set top box；

Step (C), uses root key to random number sequence { R_nCarry out second level encryption, defeated Go out the random number sequence { R after encryption_n, as the key data of Intelligent set top box.

Wherein, step (A), key generator stochastic generation random number sequence { R_nGeneration Method is,

Step (A1), if sequence vector { SⁿBe,

$S^{n+1}=\[(S_{13}^n+S_{14}^n)\mathrm{mod}b,S_0^n,S_1^n,S_2^n...S_{i-1}^n\]$

Wherein,For sequence vector { SⁿI-th component, i in the range of 0≤i≤14, Initial vector S⁰For

S⁰=[65535,0,0,65535,0,65535,0,65535,0,0,0,0,0,0,0], Mod is modulo operation, b=65536；

Step (A2), if ordered series of numbers F_nFor,

Wherein mod is modulo operation, b=65536；

Step (A3), if number sequence W_nMeet formula (1),

Wherein a=40307, b=65536, W₀With C₀For initial random seeds number, meet 0 ＜ W₀＜ b and 0 ＜ C₀＜ a, mod are modulo operation, ● for downward rounding operation；

Step (A4), by ordered series of numbers F_nAnd number sequence W_nStep-by-step XOR, obtains random number sequence { R_n} For,

$R_n=W_n\⊕F_n$

Wherein n ∈ Z and n >=0, Z is integer field,For step-by-step XOR.

Fig. 3 is the random number sequence { R generated by said method_nSpectral characteristic, Fig. 4 For the spectral characteristic of the random number sequence that traditional random function using computer to carry generates, The comparison that random performance and spectral characteristic are compared, it is apparent that Fig. 3 has more smooth frequency Spectral property.

Due to the random number sequence { R generated by said method_n, there is good randomness Energy and spectral characteristic, it is possible to increase substantially the security performance of Intelligent set top box, utilize generation Random number sequence { R_nThe clear data of Intelligent set top box is carried out first order encryption, use intelligence Can Set Top Box root key to { R_nCarry out second level encryption, to the ciphertext of Intelligent set top box, Key is encrypted respectively, improves the security performance of Intelligent set top box further, effectively prevents accident Deciphering, it is ensured that accurately carrying out of Intelligent set top box charging.

The ultimate principle of the present invention, principal character and advantage have more than been shown and described.The industry Skilled person will appreciate that, the present invention is not restricted to the described embodiments, above-described embodiment and The principle that the present invention is simply described described in description, without departing from spirit and scope of the invention On the premise of, the present invention also has various changes and modifications, and these changes and improvements both fall within to be wanted In seeking the scope of the invention of protection.Claimed scope by appending claims and Its equivalent defines.

Claims (1)

1. an intelligent set top box safe key generates method, it is characterised in that: include following Step,

Step (A), generates random number sequence { R by the key generator in Intelligent set top box_n}；

Step (B), with random number sequence { R_nIt it is the clear data of double secret key Intelligent set top box Carry out first order encryption, the ciphertext data of output Intelligent set top box；

Step (C), uses root key to random number sequence { R_nCarry out second level encryption, defeated Go out the random number sequence { R after encryption_n, as the key data of Intelligent set top box,

Described key generator stochastic generation random number sequence { R_nGeneration method be,

Step (A1), if sequence vector { SⁿBe,

$S^{n+1}=\[(S_{13}^n+S_{14}^n)\mathrm{mod}b,S_0^n,S_1^n,S_2^n...S_{i-1}^n\]$

Wherein,For sequence vector { SⁿI-th component, i in the range of 0≤i≤14, Initial vector S⁰For

S⁰=[65535,0,0,65535,0,65535,0,65535,0,0,0,0,0,0,0],

Mod is modulo operation, b=65536；

Step (A2), if ordered series of numbers F_nFor,

Wherein mod is modulo operation, b=65536；

Step (A3), if number sequence W_nMeet formula (1),

Wherein a=40307, b=65536, W₀With C₀For initial random seeds number, meet 0 ＜ W₀＜ b and 0 ＜ C₀＜ a, mod are modulo operation, ● for downward rounding operation；

Step (A4), by ordered series of numbers F_nAnd number sequence W_nStep-by-step XOR, obtains random number sequence { R_n} For,

$R_n=W_n\⊕F_n$

Wherein n ∈ Z and n >=0, Z is integer field,For step-by-step XOR.