How stream cipher works
I am new here, and I am trying to understand encryption. I have done a lot of reading here and I can not find an explanation that could help me understand.
When we are talking about stream ciphers, from what I understood, the encryption is done bit by bit.
Does that mean that the input text (let's say "Google") is encrypted character by character(because that would be byte by byte) ? Or is it converted to binary first, then the sequence of 0 and 1 is encrypted bit bi bit?
Thank you.
encryption
asked Nov 20 at 4:07
J Doe
92
add a comment |
I am new here, and I am trying to understand encryption. I have done a lot of reading here and I can not find an explanation that could help me understand.
When we are talking about stream ciphers, from what I understood, the encryption is done bit by bit.
Does that mean that the input text (let's say "Google") is encrypted character by character(because that would be byte by byte) ? Or is it converted to binary first, then the sequence of 0 and 1 is encrypted bit bi bit?
Thank you.
encryption
asked Nov 20 at 4:07
J Doe
92
add a comment |
I am new here, and I am trying to understand encryption. I have done a lot of reading here and I can not find an explanation that could help me understand.
When we are talking about stream ciphers, from what I understood, the encryption is done bit by bit.
Does that mean that the input text (let's say "Google") is encrypted character by character(because that would be byte by byte) ? Or is it converted to binary first, then the sequence of 0 and 1 is encrypted bit bi bit?
Thank you.
encryption
asked Nov 20 at 4:07
J Doe
92
I am new here, and I am trying to understand encryption. I have done a lot of reading here and I can not find an explanation that could help me understand.
When we are talking about stream ciphers, from what I understood, the encryption is done bit by bit.
Does that mean that the input text (let's say "Google") is encrypted character by character(because that would be byte by byte) ? Or is it converted to binary first, then the sequence of 0 and 1 is encrypted bit bi bit?
Thank you.
encryption
encryption
asked Nov 20 at 4:07
J Doe
92
asked Nov 20 at 4:07
J Doe
92
asked Nov 20 at 4:07
J Doe
92
asked Nov 20 at 4:07
J Doe
92
asked Nov 20 at 4:07
J Doe
92
92
add a comment |
add a comment |
1 Answer
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When we are talking about stream ciphers, from what I understood, the encryption is done bit by bit.
I assume you are talking about the simple XOR-ing of plaintext with the cipherstream.
Stream ciphers are often defined (theoretically, as a formal definition) as PRG (pseudo random generator) producing bit by bit with non-guessable probability. I've seen such a definition in multiple courses. You could (in theory) apply the XOR operation bit byt bit. As you've already find out that would not be very practical in current computer architecture.
Or is it converted to binary first, then the sequence of 0 and 1 is encrypted bit bi bit?
Practically the cipher streams are having some internal state and produces the output as stream of bytes or a byte array. As a result the string is converted as a byte array and and XOR is applied to the whole array (byte by byte or whole chunks of bytes)
answered Nov 20 at 6:55
gusto2
4,4512919
add a comment |
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1 Answer
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1 Answer
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oldest
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When we are talking about stream ciphers, from what I understood, the encryption is done bit by bit.
I assume you are talking about the simple XOR-ing of plaintext with the cipherstream.
Stream ciphers are often defined (theoretically, as a formal definition) as PRG (pseudo random generator) producing bit by bit with non-guessable probability. I've seen such a definition in multiple courses. You could (in theory) apply the XOR operation bit byt bit. As you've already find out that would not be very practical in current computer architecture.
Or is it converted to binary first, then the sequence of 0 and 1 is encrypted bit bi bit?
Practically the cipher streams are having some internal state and produces the output as stream of bytes or a byte array. As a result the string is converted as a byte array and and XOR is applied to the whole array (byte by byte or whole chunks of bytes)
answered Nov 20 at 6:55
gusto2
4,4512919
add a comment |
When we are talking about stream ciphers, from what I understood, the encryption is done bit by bit.
I assume you are talking about the simple XOR-ing of plaintext with the cipherstream.
Stream ciphers are often defined (theoretically, as a formal definition) as PRG (pseudo random generator) producing bit by bit with non-guessable probability. I've seen such a definition in multiple courses. You could (in theory) apply the XOR operation bit byt bit. As you've already find out that would not be very practical in current computer architecture.
Or is it converted to binary first, then the sequence of 0 and 1 is encrypted bit bi bit?
Practically the cipher streams are having some internal state and produces the output as stream of bytes or a byte array. As a result the string is converted as a byte array and and XOR is applied to the whole array (byte by byte or whole chunks of bytes)
answered Nov 20 at 6:55
gusto2
4,4512919
add a comment |
When we are talking about stream ciphers, from what I understood, the encryption is done bit by bit.
I assume you are talking about the simple XOR-ing of plaintext with the cipherstream.
Stream ciphers are often defined (theoretically, as a formal definition) as PRG (pseudo random generator) producing bit by bit with non-guessable probability. I've seen such a definition in multiple courses. You could (in theory) apply the XOR operation bit byt bit. As you've already find out that would not be very practical in current computer architecture.
Or is it converted to binary first, then the sequence of 0 and 1 is encrypted bit bi bit?
Practically the cipher streams are having some internal state and produces the output as stream of bytes or a byte array. As a result the string is converted as a byte array and and XOR is applied to the whole array (byte by byte or whole chunks of bytes)
answered Nov 20 at 6:55
gusto2
4,4512919
When we are talking about stream ciphers, from what I understood, the encryption is done bit by bit.
I assume you are talking about the simple XOR-ing of plaintext with the cipherstream.
Stream ciphers are often defined (theoretically, as a formal definition) as PRG (pseudo random generator) producing bit by bit with non-guessable probability. I've seen such a definition in multiple courses. You could (in theory) apply the XOR operation bit byt bit. As you've already find out that would not be very practical in current computer architecture.
Or is it converted to binary first, then the sequence of 0 and 1 is encrypted bit bi bit?
Practically the cipher streams are having some internal state and produces the output as stream of bytes or a byte array. As a result the string is converted as a byte array and and XOR is applied to the whole array (byte by byte or whole chunks of bytes)
answered Nov 20 at 6:55
gusto2
4,4512919
answered Nov 20 at 6:55
gusto2
4,4512919
answered Nov 20 at 6:55
gusto2
4,4512919
answered Nov 20 at 6:55
gusto2
4,4512919
4,4512919
add a comment |
add a comment |
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