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

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?


Programming Languages

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.

Programming Languages

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?

Development Tools & Services

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
Programming Languages
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?
Programming Languages
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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