how did || come to be used in crypto texts to represent concatenation?
In RFC5647, NIST SP 800-38D, etc, || is used to denote concatenation. How did that come to be?
In most programming languages || represents "or" and + denotes concatenation and the fact that crypto text's just kinda switched it up seems to make for an easy gotcha.
nist standards literature
asked 10 hours ago
neubert
1,1591428
add a comment |
In RFC5647, NIST SP 800-38D, etc, || is used to denote concatenation. How did that come to be?
In most programming languages || represents "or" and + denotes concatenation and the fact that crypto text's just kinda switched it up seems to make for an easy gotcha.
nist standards literature
asked 10 hours ago
neubert
1,1591428
Don't remember how it started to appears in articles, however, using plus was confusing with math plus if you don't carefully look at the notation of the articles.
– kelalaka
3 hours ago
I'd argue that it's programming languages that use weird notation. The symbol for logical or has as far as I can tell always been $lor$. So there isn't really any confusion.
– Maeher
3 hours ago
add a comment |
In RFC5647, NIST SP 800-38D, etc, || is used to denote concatenation. How did that come to be?
In most programming languages || represents "or" and + denotes concatenation and the fact that crypto text's just kinda switched it up seems to make for an easy gotcha.
nist standards literature
asked 10 hours ago
neubert
1,1591428
In RFC5647, NIST SP 800-38D, etc, || is used to denote concatenation. How did that come to be?
In most programming languages || represents "or" and + denotes concatenation and the fact that crypto text's just kinda switched it up seems to make for an easy gotcha.
nist standards literature
nist standards literature
asked 10 hours ago
neubert
1,1591428
asked 10 hours ago
neubert
1,1591428
asked 10 hours ago
neubert
1,1591428
asked 10 hours ago
neubert
1,1591428
asked 10 hours ago
neubert
1,1591428
1,1591428
Don't remember how it started to appears in articles, however, using plus was confusing with math plus if you don't carefully look at the notation of the articles.
– kelalaka
3 hours ago
I'd argue that it's programming languages that use weird notation. The symbol for logical or has as far as I can tell always been $lor$. So there isn't really any confusion.
– Maeher
3 hours ago
add a comment |
Don't remember how it started to appears in articles, however, using plus was confusing with math plus if you don't carefully look at the notation of the articles.
– kelalaka
3 hours ago
I'd argue that it's programming languages that use weird notation. The symbol for logical or has as far as I can tell always been $lor$. So there isn't really any confusion.
– Maeher
3 hours ago
Don't remember how it started to appears in articles, however, using plus was confusing with math plus if you don't carefully look at the notation of the articles.
– kelalaka
3 hours ago
Don't remember how it started to appears in articles, however, using plus was confusing with math plus if you don't carefully look at the notation of the articles.
– kelalaka
3 hours ago
I'd argue that it's programming languages that use weird notation. The symbol for logical or has as far as I can tell always been $lor$. So there isn't really any confusion.
– Maeher
3 hours ago
I'd argue that it's programming languages that use weird notation. The symbol for logical or has as far as I can tell always been $lor$. So there isn't really any confusion.
– Maeher
3 hours ago
add a comment |
2 Answers
2
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The origin is set theory and not programming languages. In the context of cryptography, I could describe a set that is
$$x_1 parallel x_2 parallel dots parallel x_n$$
as a concatenation sum of
$$parallel_{i=1}^n x_i$$
Furthermore, it's worth noting that + to a mathematician would suggest that it is a commutative, which might not be true depending on the set (as we could have a set of function). Cryptographers just lazily use $parallel$ as their sets are just rational numbers where nothing mathematically terrible will happen.
answered 2 hours ago
b degnan
1,5991625
add a comment |
Some languages like PL/I and Oracle Database SQL indeed use || for string concatenation.
One reason is maybe that + might be confusing when talking about fundamental cryptography, since there is a lot of math involved. The mathematical notation for 'OR' would be reversed caret $lor$ and the exclusive 'OR', better known as 'XOR' is a circled plus $oplus$.
But I don't think that there is a specific reason for using || for a string concatenation. If anything then I would presume that someone used it once early and then it has become accustomed until it has become a standard for cryptography.
answered 2 hours ago
AleksanderRas
1,6541525
add a comment |
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2 Answers
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active
oldest
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2 Answers
2
active
oldest
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The origin is set theory and not programming languages. In the context of cryptography, I could describe a set that is
$$x_1 parallel x_2 parallel dots parallel x_n$$
as a concatenation sum of
$$parallel_{i=1}^n x_i$$
Furthermore, it's worth noting that + to a mathematician would suggest that it is a commutative, which might not be true depending on the set (as we could have a set of function). Cryptographers just lazily use $parallel$ as their sets are just rational numbers where nothing mathematically terrible will happen.
answered 2 hours ago
b degnan
1,5991625
add a comment |
The origin is set theory and not programming languages. In the context of cryptography, I could describe a set that is
$$x_1 parallel x_2 parallel dots parallel x_n$$
as a concatenation sum of
$$parallel_{i=1}^n x_i$$
Furthermore, it's worth noting that + to a mathematician would suggest that it is a commutative, which might not be true depending on the set (as we could have a set of function). Cryptographers just lazily use $parallel$ as their sets are just rational numbers where nothing mathematically terrible will happen.
answered 2 hours ago
b degnan
1,5991625
add a comment |
The origin is set theory and not programming languages. In the context of cryptography, I could describe a set that is
$$x_1 parallel x_2 parallel dots parallel x_n$$
as a concatenation sum of
$$parallel_{i=1}^n x_i$$
Furthermore, it's worth noting that + to a mathematician would suggest that it is a commutative, which might not be true depending on the set (as we could have a set of function). Cryptographers just lazily use $parallel$ as their sets are just rational numbers where nothing mathematically terrible will happen.
answered 2 hours ago
b degnan
1,5991625
The origin is set theory and not programming languages. In the context of cryptography, I could describe a set that is
$$x_1 parallel x_2 parallel dots parallel x_n$$
as a concatenation sum of
$$parallel_{i=1}^n x_i$$
Furthermore, it's worth noting that + to a mathematician would suggest that it is a commutative, which might not be true depending on the set (as we could have a set of function). Cryptographers just lazily use $parallel$ as their sets are just rational numbers where nothing mathematically terrible will happen.
answered 2 hours ago
b degnan
1,5991625
answered 2 hours ago
b degnan
1,5991625
answered 2 hours ago
b degnan
1,5991625
answered 2 hours ago
b degnan
1,5991625
1,5991625
add a comment |
add a comment |
Some languages like PL/I and Oracle Database SQL indeed use || for string concatenation.
One reason is maybe that + might be confusing when talking about fundamental cryptography, since there is a lot of math involved. The mathematical notation for 'OR' would be reversed caret $lor$ and the exclusive 'OR', better known as 'XOR' is a circled plus $oplus$.
But I don't think that there is a specific reason for using || for a string concatenation. If anything then I would presume that someone used it once early and then it has become accustomed until it has become a standard for cryptography.
answered 2 hours ago
AleksanderRas
1,6541525
add a comment |
Some languages like PL/I and Oracle Database SQL indeed use || for string concatenation.
One reason is maybe that + might be confusing when talking about fundamental cryptography, since there is a lot of math involved. The mathematical notation for 'OR' would be reversed caret $lor$ and the exclusive 'OR', better known as 'XOR' is a circled plus $oplus$.
But I don't think that there is a specific reason for using || for a string concatenation. If anything then I would presume that someone used it once early and then it has become accustomed until it has become a standard for cryptography.
answered 2 hours ago
AleksanderRas
1,6541525
add a comment |
Some languages like PL/I and Oracle Database SQL indeed use || for string concatenation.
One reason is maybe that + might be confusing when talking about fundamental cryptography, since there is a lot of math involved. The mathematical notation for 'OR' would be reversed caret $lor$ and the exclusive 'OR', better known as 'XOR' is a circled plus $oplus$.
But I don't think that there is a specific reason for using || for a string concatenation. If anything then I would presume that someone used it once early and then it has become accustomed until it has become a standard for cryptography.
answered 2 hours ago
AleksanderRas
1,6541525
Some languages like PL/I and Oracle Database SQL indeed use || for string concatenation.
One reason is maybe that + might be confusing when talking about fundamental cryptography, since there is a lot of math involved. The mathematical notation for 'OR' would be reversed caret $lor$ and the exclusive 'OR', better known as 'XOR' is a circled plus $oplus$.
But I don't think that there is a specific reason for using || for a string concatenation. If anything then I would presume that someone used it once early and then it has become accustomed until it has become a standard for cryptography.
answered 2 hours ago
AleksanderRas
1,6541525
answered 2 hours ago
AleksanderRas
1,6541525
answered 2 hours ago
AleksanderRas
1,6541525
answered 2 hours ago
AleksanderRas
1,6541525
1,6541525
add a comment |
add a comment |
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Don't remember how it started to appears in articles, however, using plus was confusing with math plus if you don't carefully look at the notation of the articles.
– kelalaka
3 hours ago
I'd argue that it's programming languages that use weird notation. The symbol for logical or has as far as I can tell always been $lor$. So there isn't really any confusion.
– Maeher
3 hours ago