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| bio | website | |
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| location | ||
| age | ||
| visits | member for | 11 months |
| seen | May 9 at 17:18 | |
| stats | profile views | 5 |
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Aug 24 |
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How do ciphers change plaintext into numeric digits for computing? @CodesInChaos: Thanks! I didn't know. I will research this and update my answer or delete the answer. |
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Aug 23 |
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Making a cipher (ex: Vigenere) harder to break @B-Con: Ahh, I see. So 2^(4.7) = 26. How would one actually do this? I am not sure that I understand. |
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Aug 23 |
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Making a cipher (ex: Vigenere) harder to break @CodesInChaos: Thanks for the comment. I don't want to use this for anything serious, I am just learning. I would like to understand how one might combine the Vigenere with something simple. Something that would be easy to understand and to implement. What do you mean by the 4.7 bit one? |
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Aug 20 |
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Are there hash algorithms with variable length output? Thanks for the answer. Since you asked: The reason for my questions wasn't deep at all. I had thought about padding of keys/passwords, and was thinking that instead of padding key, one could just generate a hash of a specific length of a key. Thereby all key lengths should be "allowed", but I don't know if this is secure. I will probably ask a question about this later after I have thought more about it. |
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Jun 15 |
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Assistance Cracking Classical Cipher Eli, I would have to agree with Hendrik. Of course one can find the key from your solution, but that doesn't help the OP learn how to actually find the key in future problems. |
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Jun 13 |
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RSA Proof of Correctness Could you try to explain exactly what you do understand and what you don't understand? Do you understand Fermat's little theorem? What about the Chinese remainder theorem? |
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Jun 12 |
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Looking for cipher that uses one ciphertext @Globalnomad: Ok, I understand now. It sounds like David's answer is what you need then. (I actually don't know enough about this...). |
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Jun 12 |
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Looking for cipher that uses one ciphertext So just to make sure I understand. You want the teacher to just encrypt say one file, giving you one ciphertext. (so one plaintext and *on*e ciphertext) And the you want to give the recipients each a different password, so that each password decrypts the message. But you want the result of the decryption to be different depending on who decrypted the message? So the teacher does not have different messages that he/she encrypts differently? |
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Jun 11 |
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Hash function in PBKDF2 Thanks for the answer. Yes I am just doing this for fun. I don't actually need to encrypt anything. But I would like something that wasn't trivial and something that doesn't show obvious signs of pattern. I read more about the hash functions, and I see that I was wrong... |
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Jun 11 |
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Looking for cipher that uses one ciphertext (I am also new to cryptography). Have you looked at RSA? Here the recipients have their one key that John can use to encrypt the message with. Thereby each will receive a message that "looks" different. Only the recipient will be able to decrypt the message. |
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Jun 10 |
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Padding for the TEA Ok, so I think that I understand how to do the plaintext padding. If I want to use this PBKDF2, how exactly would I do that? I see that it requires salt. How, for example does one produce that? (This might be an entirely new question?) |
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Jun 9 |
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Padding for the TEA @ChrisSmith: I missed that... thanks for the suggestion! |
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Jun 9 |
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Padding for the TEA @ChrisSmith: Yes, I am doing this more as an exercise in the algorithm. I will try to do both modes. So, I can't find anything about the PKCS5. I found something about PKSCS7 on Wikipedia: en.wikipedia.org/wiki/Padding_%28cryptography%29#Bit_padding |
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Jun 9 |
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Padding for the TEA @ChrisSmith: I think I am using the ECB mode |
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Jun 4 |
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Are there any simple and yet secure encryption algorithms? @fgrieu thanks for the suggestion. This looks like exactly what I want. I have been reading in a book about the Feistel structure, the TEA looks like that. So that is probably a good place to start. |
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Jun 1 |
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Decimal to binary question Did my answer help? |
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Jun 1 |
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Decimal to binary question Do you want to know why it works or the details of how it works? |
