Is it possible to generate an RSA SHA1 signature only from a public key?

Is it possible to generate signature only from Public key. See example below where i have valid signature but what if I change hash ? Is then any way to do this?

Public key(160 bytes):

024000004800000940000000602000000240000525341310004000001000100B7
07FC3AAB7771D20A90D20733465EF22ECF30E5FC06DEB9F643443966DC7AC6D1D
75270373B7146303431E3201B5366BF2B93A03F75E5936EC15BCBE7DCA1


Public key exponent(4 bytes) :

00010001


Public key modulus(128 bytes):

A1DCE7CB5BC16E93E5753FA0932BBF66531B20E331343046713B377
68C515F7D3D3DF725C2FEFA32115AC3A37B7


Hash(20 bytes):

5EC4612543BFAACC5604C4C6796068E58244F937


Signature(128 bytes):

92DA7C04209EBB55823157D23B5E6EED67DC40A64FEEE3C5AF8EE59C0
D5BD2E200F508B6AA3EE15FAB1898EC32A9FFDFC2426F6C3A6FEC3D84
E4D7A14B67D50E231455F1680589EC6560FEC29DF87103E5F469EFC76
B7BA50E884DF09190D56CA781935

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If this were easily possible, do you think anyone would still use RSA? –  Paŭlo Ebermann Feb 16 '13 at 15:57
The idea that "a public key allows you to verify signatures but does not allow you to create new ones" really is the concept behind public key cryptography. –  poncho Feb 16 '13 at 19:05
What would be the point of a signature that anyone could make? What purpose would it serve? –  David Schwartz Feb 18 '13 at 4:08