# Super-symmetric Stream cipher [closed]

What I want to know is, Is there a stream cipher with two modes Mode-1 (encrypt/decrypt) and Mode-2 (decrypt/encrypt)

i.e. it should be possible to encrypt and decrypt using Mode-1 and Mode-2 respectively and also it should be possible to encrypt and decrypt using Mode-2 and Mode-1 respectively.

Is it possible? if so let me know such stream cipher?

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 This is still not a coherent question. – CodesInChaos Jan 24 at 17:07 Assume if there is such a stream cipher, i.e. two outputs from two modes (Mode-1 and Mode-2) for the same Plain-Text and Key (password) is entirely different and each output is reversible using the same password and Mode-2 and Mode-1 respectively. What does it mean/imply? – Auth Jan 24 at 17:29 It means that if done well you have to independant stream ciphers – Alexandre Yamajako Jan 24 at 17:50 Is there any significance to naming encryption/decryption in different order for your modes? And what do you want out of those modes? Do you just want two independent stream ciphers? That's easily achieved using a KDF, no matter which stream cipher you use. – CodesInChaos Jan 24 at 17:58 If it is two independent stream ciphers then reversal from cipher-text-1 and cipher-text-2 to Plain-text may be difficult or not possible. Is it POSSIBLE mathematically to have SINGLE stream cipher with the above mentioned behaviour (super-symmetry)? i.e. Encryption: Mode-1: F(x, k) = y1; Mode-2: F-1(x, k) = y2; Decryption: Mode-2: F-1(y1, k) = x; Mode-1: F(y2, k) = x; where F is Mode-1; F-1 is Mode-2; x is plain-text; k is password/key; and y1 and y2 are two entirely different outputs. – Auth Jan 24 at 19:06
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## closed as not a real question by CodesInChaos, Ilmari Karonen, Thomas, B-Con, MaeherFeb 10 at 10:53

It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, see the FAQ.