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Java Forum / General / May 2006how can use xor logic
hi i want encryption & decryption when enter password iwant use xor to make this how that??? please tell me > hi > i want encryption & decryption when enter password > iwant use xor to make this > how that??? Use the ^ operator. See http://java.sun.com/docs/books/jls/third_edition/html/expressions.html#15.22.1 - Oliver > hi > i want encryption & decryption when enter password > iwant use xor to make this > how that??? > > please tell me If all you want to do is obscure something, then XOR will work just fine. If true security is an issue then you will want to use something else, perhaps a product you didn't write yourself. -- LTP :) > If true security is an issue then you will want to use something else, > perhaps a product you didn't write yourself. What have you got that's cryptographically stronger than xor against a OTP of good noise? >> If true security is an issue then you will want to use something else, >> perhaps a product you didn't write yourself. > > What have you got that's cryptographically stronger than xor against a OTP > of good noise? It's not the technique (i.e. OTP) which leads to weakness, it's implementing it yourself (and potentially introducing bugs) which does. A common story is trace of the cleartext being present in a temporary file or in the system swap file. - Oliver >> If true security is an issue then you will want to use something else, >> perhaps a product you didn't write yourself. > > What have you got that's cryptographically stronger than xor against a OTP > of good noise? Ok - where do you get your noise? How do you share it? A person that does not know how to XOR two numbers together needs more experience before writing cryptographic software. -- LTP :) > Ok - where do you get your noise? How do you share it? I never said it would be easy. > A person that does not know how to XOR two numbers together needs more > experience before writing cryptographic software. Based on the original post, I just figured it was some educational exercise where the poster had little risk. If it's something more significant than that, I'd point out that there are people with Ph.D.'s in CS and Math working in bakeries and bookshops. >> A person that does not know how to XOR two numbers together needs more >> experience before writing cryptographic software. > > Based on the original post, I just figured it was some educational > exercise where the poster had little risk. A naive assumption. He could be a conspiracy theorist who believes that all software programs have backdoors in them to allow hacking, so he will protect himself by XORing against a passphrase represented in ASCII, repeated. Perhaps the appropriate question would have been what it would be used for. But as the OP has not again posted, I am not so sure he/she is following the thread at all. Encoding and stenographics can be fun, but true security comes from the Ph.D.'s as you mentioned. (Although I didn't follow your part about bakeries.) -- LTP :) > Encoding and stenographics can be fun, but true security comes from the > Ph.D.'s as you mentioned. (Although I didn't follow your part about > bakeries.) Oh, it's just a reference to the irony of someone like the original poster working as a software engineer, drawing a salary, while people who would be far more qualified are lucky to be baking dinner rolls in a cafeteria, or working as cashier in a book store. That sort of thing. The janitor at Lincoln Center is a tenor with a high C... > hi > i want encryption & decryption when enter password > iwant use xor to make this > how that??? > > please tell me Take your clear text and some randomly generated text. xor each bit of the clear text with each bit of the random text. Never reuse that block of randomly generated text. This simple cipher turns out to be among the strongest forms of encryption. The hard part is if you have to transmit that secret text to some recipient, of course... Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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