Why do these public keys all start the same? [closed]

Why do these public keys all start the same? [closed]

References

Reference NO 1

http://stackoverflow.com/questions/13588751/why-do-these-public-keys-all-start-the-same

Reference NO 2

http://en.wikipedia.org/wiki/Public-key_cryptography

Reference NO 3

http://the.earth.li/~sgtatham/putty/0.55/htmldoc/Chapter8.html

Reference NO 4

https://help.github.com/articles/generating-ssh-keys

Reference NO 5

http://www.openssl.org/docs/apps/rsa.html

Reference NO 6

http://www.pitt.edu/~poole/accessiblePGP703.htm

Reference NO 7

http://www.pgpi.org/doc/pgpintro/

Reference NO 8

http://code.google.com/p/putty-tunnel-manager/wiki/UsingPageant