Can the xor of two RNG outputs ever be less secure than one of them?



Suppose I'm suspicious that one or more (pseudo)-random number generators is cryptographically flawed, perhaps even deliberately backdoored. The RNGs in this case might be either PRNG algorithms, hardware random number generators, or some OS-provided primitive whose source might be either of these.Can it ever be a bad thing to "salt" the RNG by using the xor of its output and some other RNG's output? The latter RNG might be of much lower quality but be unlikely to have been compromised by th

Related to : Can the xor of two RNG outputs ever be less secure than one of them?
How to do <xor> in python e.g. enc_price = pad <xor> price
Information Security

I am new to crypto and I am trying to interpret the below code. Namely, what does <xor> mean?


I have a secret_key secret key. I also have a unique_id. I create pad using the below code.


pad = hmac.new(secret_key, msg=unique_id, digestmod=hashlib.sha1).digest()

Once the pad is created, I have a price e.g. 1000. I am trying to follow this instruction which is pseudocode:


enc_price = pad <xor> price

In Python, what is the code to implement enc_price = pad <xor> price? What is the logic behind doing this?



after XOR operation find C (and XOR reversability)
Information Security

Assume:


unsigned char A = 10;
unsigned char B = 11;
unsigned char C = 12;
unsigned char Diff1 = A ^ B;
unsigned char Diff2 = B ^ C;
//find any of A or B or C using Diff1 and Diff2

Question is: There were 3 values initially for which we found 2 differences. Is there any way we can find any of A or B or C using 2 differences Diff1 and Diff2?


I know XOR is not reversible unless you know the key, but keeping in view that unsigned __int8 is 0...255 maximum 256 different values.


stay well.


Would CSPRNG + XOR be a secure encryption method?
Information Security

Similarily to RC4 (RC4_PRNG+XOR ), would it be secure to use another CSPRNG(Cryptographically secure pseudorandom number generator)[Isaac, BlumBlumShub, etc) instead of RC4's and XOR the data with the resulting keystream?


C script for table outputs correctly and then outputs default case. how to fix?
Information Security

What am I doing wrong? If I press M, A, or P, it will ask me for what size table. Then it outputs the table correctly, and then outputs "not a choice....". How do i fix this?
31
32 #include<stdio.h>
33 #include<math.h>
34 #include<stdlib.h>
35
36 /* Simple symbolic constant for exit code number
37 * for homework requirement
38 */
39
40 #define EXIT_CODE 5
41
42 /* Function for multiplication table */
43
For double outputs in data table, how to move second or more outputs to new line with same index
Information Security
I have a data set that contains two fields, x and y. It is possible for x to have more than one output, y. For example: x1,y11,y12,y13,...,y1n x2,y21 x3,y31,y32 ...And I would like to manipulate the data so that it looks like: x1,y11 x1,y12 x1,y13 ... x1,y1n x2,y21 x3,y31 x3,y32 ...I'm attempting to do this with sed. Any suggestions?
Can the xor of two RNG outputs ever be less secure than one of them?
Information Security
Suppose I'm suspicious that one or more (pseudo)-random number generators is cryptographically flawed, perhaps even deliberately backdoored. The RNGs in this case might be either PRNG algorithms, hardware random number generators, or some OS-provided primitive whose source might be either of these.Can it ever be a bad thing to "salt" the RNG by using the xor of its output and some other RNG's output? The latter RNG might be of much lower quality but be unlikely to have been compromised by th

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